# EDGAR Filing Document

**Accession Number:** 0000030625
**File Stem:** 0001193125-26-219400
**Filing Date:** 2026-5
**Character Count:** 88159
**Document Hash:** c8a43085308d6a69f92b0ef34af8e4e4
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-219400.hdr.sgml**: 20260512

**ACCESSION NUMBER**: 0001193125-26-219400

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 15

**CONFORMED PERIOD OF REPORT**: 20260512

**ITEM INFORMATION**: Entry into a Material Definitive Agreement

**ITEM INFORMATION**: Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

**ITEM INFORMATION**: Other Events

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260512

**DATE AS OF CHANGE**: 20260512

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** FLOWSERVE CORP
- **CENTRAL INDEX KEY:** 0000030625
- **STANDARD INDUSTRIAL CLASSIFICATION:** PUMPS & PUMPING EQUIPMENT [3561]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 310267900
- **STATE OF INCORPORATION:** NY
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-13179
- **FILM NUMBER:** 26968512

**BUSINESS ADDRESS:**
- **STREET 1:** 5215 N. O'CONNOR BLVD.
- **STREET 2:** SUITE 700
- **CITY:** IRVING
- **STATE:** TX
- **ZIP:** 75039
- **BUSINESS PHONE:** 9724436500

**MAIL ADDRESS:**
- **STREET 1:** 5215 N. O'CONNOR BLVD.
- **STREET 2:** SUITE 700
- **CITY:** IRVING
- **STATE:** TX
- **ZIP:** 75039

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** DURCO INTERNATIONAL INC
- **DATE OF NAME CHANGE:** 19970508

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** DURIRON CO INC
- **DATE OF NAME CHANGE:** 19920703

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** THE DURIRON CO INC
- **DATE OF NAME CHANGE:** 19900509

?xml version='1.0' encoding='ASCII'? 8-K

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

### FORM 8-K

#### CURRENT REPORT

#### Pursuant to Section 13 or 15(d)

#### of the Securities Exchange Act of 1934

#### Date of Report (Date of earliest event reported): May 12, 2026

## FLOWSERVE CORPORATION

#### (Exact Name of Registrant as Specified in its Charter)

---

| | | |
|:---|:---|:---|
| **New York** | **1-13179** | **31-0267900** |
| **(State or Other Jurisdiction**<br> **of Incorporation)** | **(Commission**<br> **File Number)** | **(IRS Employer**<br> **Identification No.)** |

---

---

| | |
|:---|:---|
| **5215 N. O'Connor Blvd., Suite 700, Irving, Texas** | **75039** |
| **(Address of Principal Executive Offices)** | **(Zip Code)** |

---

(972) 443-6500

#### (Registrant's telephone number, including area code)

#### N/A

#### (Former Name or Former Address, if Changed Since Last Report)
Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| **Title of each class** | **Trading**<br> **Symbol(s)** | **Name of each exchange**<br> **on which registered** |
| Common Stock, $1.25 Par Value | FLS | New York Stock Exchange |

---

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (*see* General Instruction A.2 below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2). Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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#### Item 1.01. Entry into a Material Definitive Agreement.
On May 12, 2026, Flowserve Corporation, a New York corporation (the "Company"), issued $500 million aggregate principal amount of its 5.700% Senior Notes due 2036 (the "Notes"). The Notes were issued pursuant to a Senior Indenture, dated as of September 11, 2012 (the "Base Indenture"), between the Company and U.S. Bank Trust Company, National Association (as successor-in-interest to U.S. Bank National Association), as Trustee (the "Trustee"), as supplemented by the Sixth Supplemental Indenture, dated as of May 12, 2026 (the "Sixth Supplemental Indenture" and, together with the Base Indenture, the "Indenture"), between the Company and the Trustee. Capitalized terms used in this current report and not defined herein have the meanings ascribed to them in the Indenture.

Interest on the Notes is payable semi-annually on May 15 and November 15 of each year, commencing on November 15, 2026. The Notes mature on May 15, 2036.

In the event that (i) the Company's acquisition of Trillium Flow Technologies Valves Division (the "Trillium Flow Acquisition") is not consummated on or prior to February 4, 2027 or such later date as the parties to the purchase agreement may agree as the "Longstop Date" thereunder, or (ii) the purchase agreement related thereto is terminated without the Trillium Flow Acquisition being consummated, the Company will be required to redeem all of the outstanding Notes at a redemption price equal to 101% of the aggregate principal amount of such Notes plus accrued interest thereon, if any, to the Redemption Date (such required redemption, a "Special Mandatory Redemption").

Prior to February 15, 2036 (three months prior to their maturity date) (the "Par Call Date"), the Company may redeem the Notes at the Company's option, in whole or in part, at any time and from time to time, at a Redemption Price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) (a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the Redemption Date (assuming the Notes matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 20 basis points less (b) interest accrued to the Redemption Date; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) 100% of the principal amount of the Notes to be redeemed,

plus, in either case, accrued and unpaid interest thereon to the Redemption Date.

On or after the Par Call Date, the Company may redeem the Notes, in whole or in part, at any time and from time to time, at a Redemption Price equal to 100% of the principal amount of the Notes being redeemed plus accrued and unpaid interest thereon to the Redemption Date.

The Notes are subject to redemption upon at least 10 days' but not more than 60 days' prior written notice before the Redemption Date to each holder of Notes to be redeemed.

The Indenture contains customary terms and covenants, including covenants that limit, among other things, the ability of (i) the Company and its Material Subsidiaries to create liens on any Principal Property that secure indebtedness unless the Notes are secured equally and ratably with such indebtedness and (ii) the Company to consolidate with or merge into any other entity or sell, transfer or lease all or substantially all of the Company's assets to another entity. Under certain events of default, including, without limitation, failure to pay when due any principal amount, certain cross defaults to other instruments or failure to make the Special Mandatory Redemption, if required, the Trustee may (and at the direction of the Holders of at least 25% in principal amount of the outstanding Notes shall) declare the principal amount of the Notes to be due and payable immediately. In the case of certain events of bankruptcy or insolvency of the Company or any Significant Subsidiary, the principal amount of the Notes will be automatically due and payable immediately.

The Notes are the Company's general senior unsecured obligations, are not guaranteed by any of the Company's subsidiaries, rank equally in right of payment with the Company's existing and future senior unsecured indebtedness and are effectively subordinated to all indebtedness and other liabilities of the Company's subsidiaries and to all of the Company's secured indebtedness to the extent of the value of the collateral securing such indebtedness.

------

The foregoing description of the issuance and sale of the Notes and the terms thereof does not purport to be complete and is qualified in its entirety by reference to the full text of the Base Indenture and the Sixth Supplemental Indenture, which are filed as Exhibits 4.1 and 4.2, respectively, and incorporated herein by reference. The form of Note, which is included as part of the Sixth Supplemental Indenture, is filed as Exhibit 4.3 and incorporated herein by reference.

#### Item 2.03. Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.
The information set forth under Item 1.01 is incorporated herein by reference.

#### Item 8.01. Other Events.
In connection with the offering of the Notes, Gibson, Dunn & Crutcher LLP delivered a legal opinion with respect to the validity of the Notes, which opinion is filed as Exhibit 5.1 hereto and is incorporated by reference into the Registration Statement on Form S-3 (No. 333-286219), filed with the Securities and Exchange Commission on March 28, 2025.

#### Item 9.01. Financial Statements and Exhibits.
(d) Exhibits

---

| | |
|:---|:---|
| **Exhibit No.** | **Description** |
| 4.1 | [Senior Indenture, dated as of September 11, 2012, by and between Flowserve Corporation and U.S. Bank Trust Company, National Association (as successor-in-interest to U.S. Bank National Association), as Trustee (incorporated by reference herein to Exhibit 4.1 to the Form 8-K filed with the Securities and Exchange Commission on September 11, 2012).](http://www.sec.gov/Archives/edgar/data/30625/000119312512387662/d409082dex41.htm) |
| 4.2 | [Sixth Supplemental Indenture, dated as of May 12, 2026, between Flowserve Corporation and U.S. Bank Trust Company, National Association (as successor-in-interest to U.S. Bank National Association), as Trustee.](d133335dex42.htm) |
| 4.3 | [Form of Note (included in Exhibit 4.2).](d133335dex42.htm) |
| 5.1 | [Opinion of Gibson, Dunn & Crutcher LLP relating to the validity of the Notes.](d133335dex51.htm) |
| 23.1 | [Consent of Gibson, Dunn & Crutcher LLP (included in Exhibit 5.1).](d133335dex51.htm) |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document). |

---

------

#### SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | | |
|:---|:---|:---|
|  | FLOWSERVE CORPORATION | FLOWSERVE CORPORATION |
| Date: May 12, 2026 | By: | /s/ Amy B. Schwetz |
|  |  | Amy B. Schwetz<br> Senior Vice President, Chief Financial Officer |

---

## Exhibit 4.2

**Exhibit 4.2** 

EXECUTION VERSION

This SIXTH SUPPLEMENTAL INDENTURE (this "<u>Sixth Supplemental Indenture</u>"), dated as of May 12, 2026, among FLOWSERVE CORPORATION, a New York corporation (the "<u>Company</u>"), and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (as successor-in-interest to U.S. Bank National Association), as trustee (the "<u>Trustee</u>").

RECITALS

WHEREAS, the Company and the Trustee are parties to an indenture, dated as of September 11, 2012 (the "<u>Indenture</u>"), providing for the issuance by the Company from time to time of its debt securities to be issued in one or more series;

WHEREAS, Sections 2.01 and 9.01 of the Indenture provide, among other things, that the Company and the Trustee may, without the consent of Holders, enter into indentures supplemental to the Indenture to provide for specific terms applicable to any series of notes;

WHEREAS, the Company intends by this Sixth Supplemental Indenture to create and provide for the issuance of a new series of Securities to be designated as the "5.700% Senior Notes due 2036" (the "<u>Notes</u>");

WHEREAS, pursuant to Section 9.01(10) of the Indenture, the Trustee and the Company are authorized to execute and deliver this Sixth Supplemental Indenture to amend or supplement the Indenture, without the consent of any Holder of Notes; and

WHEREAS, all things necessary to make the Notes, when executed by the Company and authenticated and delivered by the Trustee, issued upon the terms and subject to the conditions set forth hereinafter and in the Indenture and delivered as provided in the Indenture against payment therefor, valid, binding and legal obligations of the Company according to their terms, and all actions required to be taken by the Company under the Indenture to make this Sixth Supplemental Indenture a valid, binding and legal agreement of the Company, have been done.

NOW, THEREFORE, in consideration of the premises and for other good and valuable consideration, the sufficiency and adequacy of which are hereby acknowledged, the parties hereto hereby agree as follows:

**ARTICLE I** 

**DEFINITIONS AND INCORPORATION BY REFERENCE** 

Section 1.01. <u>Definitions</u>.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) All capitalized terms used herein and not otherwise defined below shall have the meanings ascribed thereto in the Indenture.

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) The following are definitions used in this Sixth Supplemental Indenture, and to the extent that a term is defined both herein and in the Indenture, the definition in this Sixth Supplemental Indenture shall govern with respect to the Notes.

"*Attributable Debt*" with regard to a Sale and Leaseback Transaction with respect to any Principal Property means, at the time of determination, the present value of the total net amount of rent required to be paid under the lease during the remaining term thereof (including any period for which the lease has been extended), discounted at the rate of interest set forth or implicit in the terms of the lease (or, if not practicable to determine the rate, the weighted average interest rate per annum borne by the debt securities then outstanding under the Indenture) compounded semi-annually. In the case of any lease that is terminable by the lessee upon the payment of a penalty, the net amount of rent will be the lesser of (x) the net amount determined assuming termination upon the first date the lease may be terminated (in which case the net amount will also include the amount of the penalty, but will not include any rent that would be required to be paid under the lease subsequent to the first date upon which it may be so terminated) or (y) the net amount determined assuming no such termination.

"*Capital Lease*" means a lease with respect to which the lessee is required concurrently to recognize the acquisition of an asset and the incurrence of a liability in accordance with generally accepted accounting principles in effect in the United States as of the date of the Indenture.

"*Change of Control*" means the occurrence of any one of the following:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) the direct or indirect sale, lease, transfer, conveyance or other disposition (other than by way of merger or consolidation), in one or a series of related transactions, of all or substantially all of the assets of the Company and its Subsidiaries, taken as a whole, to any "person" or "group" (as those terms are used in Section 13(d)(3) of the Exchange Act) other than to the Company and/or one or more of its Subsidiaries;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) the consummation of any transaction (including without limitation, any merger or consolidation) the result of which is that any "person" or "group" (as those terms are used in Section 13(d)(3) of the Exchange Act) becomes the "beneficial owner" (as defined in Rules 13d-3 and 13d-5 under the Exchange Act), directly or indirectly, of more than 50% of the outstanding Voting Stock of the Company, measured by voting power rather than number of shares;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3) the Company consolidates with, or merges with or into, any Person, or any Person consolidates with, or merges with or into, the Company, in any such event pursuant to a transaction in which any of the outstanding Voting Stock of the Company or the Voting Stock of such other Person is converted into or exchanged for cash, securities or other property, other than any such transaction where the shares of Voting Stock of the Company outstanding immediately prior to such transaction constitute, or are converted into or exchanged for, at least a majority of the Voting Stock of the surviving Person immediately after giving effect to such transaction; or

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4) the approval by the holders of the Voting Stock of the Company of any plan for the liquidation or dissolution of the Company.

Notwithstanding the foregoing, a transaction described in clause (2) above will not be deemed to involve a Change of Control if (1) the Company becomes a direct or indirect wholly-owned subsidiary of a holding company (which shall include a parent company) and (2)(A) the direct or indirect holders of the Voting Stock of such holding company immediately following that transaction are substantially the same as, and hold in substantially the same proportions as, the holders of the Company's Voting Stock immediately prior to that transaction or (B) (i) immediately following that transaction, the holders of the Company's Voting Stock immediately prior to that transaction are the beneficial owners, directly or indirectly, of more than 50% of the Voting Stock of such holding company and (ii) immediately following that transaction no Person (other than a holding company satisfying the requirements of this sentence) is the beneficial owner, directly or indirectly, of more than 50% of the then outstanding Voting Stock, measured by voting power rather than number of shares, of such holding company.

"*Change of Control Triggering Event*" means the occurrence of both a Change of Control and a Rating Decline with respect to the Notes.

"*Consolidated Tangible Assets*" means, as of any date, total assets (excluding treasury stock, unamortized debt discount and expense, goodwill, trademarks, trade names, patents, deferred charges and other intangible assets) of the Company and its Subsidiaries on a consolidated basis, as determined in accordance with GAAP.

"*Debt*" means with respect to a Person all obligations of such Person for borrowed money and all such obligations of any other Person for borrowed money guaranteed by such Person.

"*Existing Notes*" means the Company's 3.500% Senior Notes due October 1, 2030 and the Company's 2.800% Senior Notes due January 15, 2032.

"*Fitch*" means Fitch Ratings, Inc. and its successors.

"*Funded Debt*" means, on the date of determination, any Debt maturing by its terms more than 12 months from such date (notwithstanding that any portion of such Debt is included in current liabilities), including any Debt renewable or extendible at the option of the borrower to a date later than 12 months from such date of determination.

"*GAAP*" means generally accepted accounting principles as in effect from time to time in the United States.

"*Investment Grade Rating*" means a rating of BBB- or better by Fitch, a rating of Baa3 or better by Moody's or a rating of BBB- or better by S&P, and the equivalent investment grade credit rating from any replacement rating agency or rating agencies selected by the Company.

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"*Liens*" means, with respect to any Person, any mortgage, lien, pledge, charge, security interest or other similar encumbrance, or any interest or title of any vendor, lessor, lender or other secured party to or of such Person under any conditional sale or other title retention agreement or Capital Lease, upon or with respect to any property or asset of such Person.

"*Material Subsidiary*" means any Subsidiary of the Company which owns a Principal Property.

"*Moody's*" means Moody's Investors Service, Inc. and its successors.

"*Par Call Date*" means February 15, 2036.

"*Person*" means an individual, limited liability company, partnership, corporation, trust, unincorporated organization, association, joint venture or other entity or a government or agency or political subdivision thereof.

"*Principal Property*" means any manufacturing plant, warehouse, office building or parcel of real property, including fixtures but excluding leases and other contract rights which might otherwise be deemed real property, owned by the Company or any of its Subsidiaries, whether owned on the date of the Indenture or thereafter acquired, that has a gross book value (determined in accordance with GAAP) in excess of 1.0% of the Consolidated Tangible Assets of the Company and its consolidated subsidiaries. Any plant, warehouse, office building or parcel of real property or portion thereof will not be a Principal Property if the Company's board of directors in good faith determines it is not of material importance to the business conducted by the Company and its Subsidiaries taken as a whole.

"*Rating Agency*" means each of Fitch, Moody's and S&P, or if at least two of such agencies shall not make a rating on the Notes publicly available, a nationally recognized statistical rating agency or agencies (as defined in Section 3(a)(62) of the Exchange Act), as the case may be, selected by the Company which shall be substituted for Fitch, Moody's or S&P, or two of them, as the case may be.

"*Rating Decline*" shall be deemed to have occurred in relation to the Notes if, on any date from the date of the public notice of an arrangement that could result in a Change of Control until the end of the 60-day period following public notice of the occurrence of the Change of Control (which period shall be extended so long as the rating of the Notes is under publicly announced consideration for a possible downgrade by any of the Rating Agencies and one of the other Rating Agencies has either downgraded, or publicly announced that it is considering a possible downgrading of, the Notes), at least two of the Rating Agencies decreases its rating of the Notes by one or more gradations (including gradations within categories as well as between rating categories) to a rating that is below its rating of the Notes on the day immediately prior to the earlier of (i) the date of the first public announcement of the possibility of a proposed transaction that

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would result in a Change of Control or (ii) the date that the possibility of such transaction is disclosed to any of the Rating Agencies. Notwithstanding the foregoing, if the Notes have an Investment Grade Rating by at least two of the Rating Agencies on the day immediately prior to the earlier of (i) the date of the first public announcement of the possibility of a proposed transaction that would result in a Change of Control or (ii) the date that the possibility of such transaction is disclosed to any of the Rating Agencies (each such Rating Agency referred to as a "*Specified Rating Agency*"), then "Rating Decline" means a decrease in the ratings of the Notes by one or more gradations (including gradations within categories as well as between rating categories) by at least two of the Specified Rating Agencies such that the rating of the Notes by at least two of the Specified Rating Agencies falls below an Investment Grade Rating no later than 60 days following public notice of the occurrence of the Change of Control (which 60-day period shall be extended so long as the rating of the Notes is under publicly announced consideration for a possible downgrade by any of the Specified Rating Agencies and one of the other Specified Rating Agencies has either downgraded, or publicly announced that it is considering a possible downgrading of, the Notes).

"*S&P*" means S&P Global Ratings, a division of S&P Global Inc., and its successors.

"*Sale and Leaseback Transaction*" means any arrangement with any Person relating to property now owned or hereafter acquired whereby the Company or any Subsidiary transfers such property to another Person and the Company or the Subsidiary leases or rents it from such Person.

"*Subsidiary*" means any corporation, partnership or other legal entity (a) the accounts of which are consolidated with the Company's in accordance with GAAP and (b) of which, in the case of a corporation, more than 50% of the outstanding Voting Stock is owned, directly or indirectly, by the Company or by one or more other Subsidiaries, or by the Company and one or more other Subsidiaries or, in the case of any partnership or other legal entity, more than 50% of the ordinary equity capital interests is, at the time, directly or indirectly owned or controlled by the Company or by one or more of the Subsidiaries or by the Company and one or more of the Subsidiaries.

"*Treasury Rate*" means, with respect to any Redemption Date, the yield determined by the Company in accordance with the following two paragraphs:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) The Treasury Rate shall be determined by the Company after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third Business Day preceding the Redemption Date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as "Selected Interest Rates (Daily) — H.15" (or any successor designation or publication) ("*H.15*") under the caption "U.S. government securities–Treasury constant maturities–Nominal" (or any successor caption or heading) ("*H.15 TCM*"). In determining the Treasury Rate, the

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Company shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the Redemption Date to the Par Call Date (the "*Remaining Life*"); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields – one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life – and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the Redemption Date.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) If on the third Business Day preceding the Redemption Date H.15 TCM is no longer published, the Company shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second Business Day preceding such Redemption Date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date, one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Company shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Company shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

"*Trillium Flow Acquisition*" means the purchase of the shares comprising the entire issued share capital of FR Flow Control Valves Bidco Limited, a company incorporated under the laws of England and Wales, as contemplated by the Trillium Flow Purchase Agreement.

"*Trillium Flow Purchase Agreement*" means the Agreement, dated February 4, 2026, between Trillium Flow Technologies Holdco Limited, a company incorporated under the laws of England and Wales, and Flowserve Holdings, Inc., a Delaware corporation.

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"*Voting Stock*" of any specified Person as of any date means the capital stock of such Person that is at the time entitled to vote generally in the election of the board of directors of such Person.

Section 1.02. <u>Other Definitions</u>.

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| | |
|:---|:---|
| **Term** | **Defined in Section** |
| "Change of Control Offer" | 4.01(a) |
| "Change of Control Payment" | 4.01(a) |
| "Change of Control Payment Date" | 4.01(b) |
| "Interest Payment Date" | 2.04(c) |
| "Maturity Date" | 2.04(b) |
| "Regular Record Date" | 2.04(c) |
| "Special Mandatory Redemption" | 3.02(a) |
| "Special Mandatory Redemption Date" | 3.02(b) |
| "Special Mandatory Redemption Event" | 3.02(a) |
| "Special Mandatory Redemption Notice" | 3.02(b) |
| "Special Mandatory Redemption Price" | 3.02(a) |

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Section 1.03. <u>Incorporation by Reference of Trust Indenture Act</u>.

This Sixth Supplemental Indenture is subject to the mandatory provisions of the TIA, which are incorporated by reference in and made a part of this Sixth Supplemental Indenture. The following TIA terms have the following meanings:

"indenture securities" means the Notes.

"indenture security holder" means a Holder.

"indenture to be qualified" means this Sixth Supplemental Indenture.

"indenture trustee" or "institutional trustee" means the Trustee.

"obligor" on the indenture securities means the Company and any other obligor on the indenture securities.

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All other TIA terms used in this Sixth Supplemental Indenture that are defined by the TIA, defined by TIA reference to another statute or defined by SEC rules promulgated under the TIA have the meanings assigned to them by such definitions.

**ARTICLE II** 

**APPLICATION OF SUPPLEMENTAL INDENTURE** 

**AND CREATION, FORMS, TERMS AND CONDITIONS OF NOTES** 

Section 2.01. <u>Application of this Sixth Supplemental Indenture</u>. Notwithstanding any other provision of this Sixth Supplemental Indenture, the provisions of this Sixth Supplemental Indenture, including the covenants set forth herein, are expressly and solely for the benefit of the Holders of the Notes. The Notes constitute a separate series of Securities as provided in Section 2.01 of the Indenture.

Section 2.02. <u>Creation of the Notes</u>. In accordance with Section 2.01 of the Indenture, the Company hereby creates the Notes as a separate series of its Securities issued pursuant to the Indenture. The Notes shall be issued initially in an aggregate principal amount of $500,000,000.

Section 2.03. <u>Form</u> <u>of the Notes</u>. The Notes shall each be issued in the form of a Global Security, duly executed by the Company and authenticated by the Trustee, which shall be deposited with the Trustee as custodian for DTC and registered in the name of "Cede & Co.," as the nominee of DTC. The Notes shall be substantially in the form of <u>Exhibit</u> <u>A</u> attached hereto. So long as DTC, or its nominee, is the registered owner of a Global Security, DTC or its nominee, as the case may be, shall be considered the sole owner or Holder of the Notes represented by such Global Security for all purposes under the Indenture and under such Notes. Ownership of beneficial interests in such Global Security shall be shown on, and transfers thereof will be effective only through, records maintained by DTC or its nominee (with respect to beneficial interests of participants) or by participants or Persons that hold interests through participants (with respect to beneficial interests of beneficial owners).

Section 2.04. <u>Terms and Conditions of the Notes</u>.

The Notes shall be governed by all the terms and conditions of the Indenture, as supplemented by this Sixth Supplemental Indenture. In particular, the following provisions shall be terms of the Notes:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) <u>Title and Conditions of the Notes</u>. The title of the Notes shall be as specified in the Recitals; and the aggregate principal amount of the Notes shall be unlimited.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) <u>Stated Maturity</u>. The Notes shall mature, and the principal of the Notes shall be due and payable in U.S. Dollars to the Holders thereof, together with all accrued and unpaid interest thereon, on May 15, 2036 (the "<u>Maturity Date</u>").

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) <u>Payment of Principal and Interest</u>. The Notes shall bear interest at 5.700% per annum, from and including May 12, 2026, or from the most recent Interest Payment Date (as defined hereafter) on which interest has been paid or provided for until the principal thereof becomes due and payable, and on any overdue principal. Interest shall be calculated on the basis of a 360-day year comprised of twelve 30-day months. Interest on the Notes shall be payable semi-annually in arrears in U.S. Dollars on May 15 and November 15 of each year, commencing on November 15, 2026 (each such date, an "<u>Interest Payment Date</u>" for the purposes of the Notes under this Sixth Supplemental Indenture). Payments of interest shall be made to the Person in whose name a Note (or predecessor Note) is registered (which shall initially be the Depositary) at the close of business on May 1 or November 1 (whether or not that date is a Business Day), as the case may be, immediately preceding such Interest Payment Date (each such date, a "<u>Regular Record Date</u>" for the purposes of the Notes under this Sixth Supplemental Indenture).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) <u>Registration and Form</u>. The Notes shall be issuable as registered securities as provided in Section 2.03 of this Article II. The form of the Notes shall be as set forth in <u>Exhibit</u> <u>A</u> attached hereto. The Notes shall be issued and may be transferred only in minimum denomination of $2,000 and integral multiples of $1,000 in excess thereof. All payments of principal, Redemption Price, any purchase price relating to a Change of Control Offer and accrued unpaid interest in respect of the Notes shall be made by the Company as set forth in the Notes.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(e) <u>Legal Defeasance and Covenant Defeasance</u>. The provisions for legal defeasance in Section 8.02 of the Indenture, and the provisions for covenant defeasance in Section 8.03 of the Indenture, shall be applicable to the Notes. If the Company shall effect a defeasance of the Notes pursuant to Section 8.02 or Section 8.03 of the Indenture, the Company shall cease to have any obligation to comply with the covenants and agreements set forth in Articles IV and V of this Sixth Supplemental Indenture.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(f) <u>Further Issuance</u>. Notwithstanding anything to the contrary contained herein or in the Indenture, the Company may, from time to time, without the consent of or notice to the Holders, create and issue further securities having the same interest rate, maturity and other terms (except for the issue date, the public offering price and the first Interest Payment Date) as, ranking equally and ratably with, the Notes. Additional Notes issued in this manner shall be consolidated with and shall form a single series with the previously outstanding Notes.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(g) <u>Redemption</u>. The Notes are subject to redemption by the Company in whole or in part in the manner described herein.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(h) [Reserved.]

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) <u>Ranking</u>. The Notes will be the Company's unsecured and unsubordinated obligations and will rank equally with all of its current and future unsecured and unsubordinated indebtedness and senior to all of its current and future subordinated debt.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(j) <u>Sinking Fund</u>. The Notes are not entitled to any sinking fund.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(k) <u>Other Terms and Conditions</u>. The Notes shall have such other terms and conditions as provided in the form thereof attached as <u>Exhibit</u> <u>A</u> hereto.

**ARTICLE III** 

**REDEMPTION** 

Section 3.01. <u>Optional Redemption</u>.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) Prior to the Par Call Date, the Company may redeem the Notes at the Company's option, in whole or in part, at any time and from time to time, at a Redemption Price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) (1) the sum of the present values of the remaining scheduled payments of principal and interest thereon
discounted to the Redemption Date (assuming the Notes matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months)
at the Treasury Rate plus 20 basis points less (2) interest accrued to the Redemption Date; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) 100% of the principal amount of the Notes to be redeemed,

plus, in either case, accrued and unpaid interest thereon to the Redemption Date.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) On or after the Par Call Date, the Company may redeem the Notes, in whole or in part, at any time and from time to time, at a Redemption Price equal to 100% of the principal amount of the Notes being redeemed plus accrued and unpaid interest thereon to the Redemption Date.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) The Company's actions and determinations in determining the Redemption Price shall be conclusive and binding for all purposes, absent manifest error.

Section 3.02. <u>Special Mandatory Redemption</u>.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) In the event that (i) the Trillium Flow Acquisition is not consummated on or prior to February 4, 2027, or such later date as the parties to the Trillium Flow Purchase Agreement may agree as the "Longstop Date" thereunder, or (ii) the Trillium Flow Purchase Agreement is terminated without the Trillium Flow Acquisition being consummated (any such event being a "<u>Special Mandatory Redemption Event</u>"), the Company shall redeem (the "<u>Special Mandatory Redemption</u>") all of the outstanding

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Notes at a Redemption Price equal to 101% of the aggregate principal amount of such Notes, respectively, plus accrued and unpaid interest thereon, if any, to the Redemption Date (the "<u>Special Mandatory Redemption Price</u>"). For purposes of the foregoing, the Trillium Flow Acquisition shall be deemed consummated if the closing under the Trillium Flow Purchase Agreement occurs, including after giving effect to any amendments to the Trillium Flow Purchase Agreement or waivers thereunder acceptable to the Company.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) Notice of the occurrence of a Special Mandatory Redemption Event and that a Special Mandatory Redemption is to occur (the "<u>Special Mandatory Redemption Notice</u>") shall be mailed or sent electronically pursuant to applicable DTC procedures (with a copy to the Trustee) within 10 Business Days after the Special Mandatory Redemption Event. The Company may instruct the Trustee in an Officers' Certificate to send the Special Mandatory Redemption Notice in the Company's name and at the Company's expense; provided, however, that the Trustee shall receive such Officers' Certificate at least two Business Days (or such shorter time as the Trustee may agree) prior to the date such Special Mandatory Redemption Notice is to be sent. On the Redemption Date specified in the Special Mandatory Redemption Notice, which shall be no more than 10 Business Days (or such other minimum period as may be required by the Depositary) after mailing or sending the Special Mandatory Redemption Notice, the Special Mandatory Redemption shall occur (the date of such redemption, the "<u>Special Mandatory Redemption Date</u>"). If funds sufficient to pay the Special Mandatory Redemption Price of the Notes then outstanding on the Special Mandatory Redemption Date are deposited with a Paying Agent or the Trustee on or before such Special Mandatory Redemption Date, then on and after such Special Mandatory Redemption Date, the Notes shall cease to bear interest and, other than the right to receive the Special Mandatory Redemption Price, all rights under the Notes shall terminate.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) Upon the consummation of the Trillium Flow Acquisition, the foregoing provisions regarding the Special Mandatory Redemption shall cease to apply.

Section 3.03. <u>Selection of Notes to be Redeemed</u>. In the case of a partial redemption, selection of the Notes for redemption shall be made by lot. No Notes of a principal amount of $2,000 or less shall be redeemed in part. Notwithstanding the foregoing, for so long as the Notes are held by DTC (or another Depositary), the redemption of the Notes shall be done in accordance with the policies and procedures of the Depositary. Unless the Company defaults in payment of the Redemption Price, on and after the Redemption Date interest shall cease to accrue on the Notes or portions thereof called for redemption.

Section 3.04. <u>Notice of Redemption</u>. Solely with respect to the Notes, the first paragraph of Section 5.04 of the Indenture is replaced in its entirety with the following:

"Section 5.04 <u>Notice of Redemption</u>. Except with respect to a Special Mandatory Redemption, notice of redemption shall be mailed in the manner provided for in Section 12.02 or electronically delivered (or otherwise transmitted in accordance with the Depositary's procedures) at least 10 days but not more

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than 60 days before the Redemption Date to each Holder of Securities to be redeemed, except that redemption notices may be sent more than 60 days prior to a Redemption Date if such notice is issued in connection with a defeasance of the Securities or a satisfaction and discharge of this Indenture. Notice of any redemption (other than a Special Mandatory Redemption) may, at the Company's discretion, be subject to one or more conditions precedent (such as the consummation of refinancings or acquisitions, whether of the Company or by the Company). The Trustee shall send the notice of redemption (other than a Special Mandatory Redemption) in the Company's name and at the Company's expense; provided, however, that the Company shall deliver to the Trustee, at least five days (or such shorter time as the Trustee may agree) prior to the date such notice of redemption is to be sent, an Officers' Certificate requesting that the Trustee give such notice at the Company's expense and setting forth the information to be stated in such notice as provided in the following items."

Section 3.05. <u>Open Market Repurchases</u>. Notwithstanding any provision hereunder or under the Indenture to the contrary, the Company and its Affiliates may purchase Notes from investors who are willing to sell from time to time, either in the open market at prevailing prices or in private transactions at negotiated prices. Notes that the Company or any of its Affiliates purchase may, at the Company's discretion, be held, resold or canceled.

**ARTICLE IV** 

**CHANGE OF CONTROL** 

Section 4.01. <u>Change of Control</u>.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) Upon the occurrence of a Change of Control Triggering Event, unless the Company has given written notice with respect to a redemption of the Notes as described under Section 3.01, each Holder of Notes will have the right to require the Company to purchase all or a portion of such Holder's Notes pursuant to the offer described below (the "<u>Change of Control Offer</u>"), at a purchase price equal to 101% of the principal amount thereof plus accrued and unpaid interest, if any, to the date of purchase (the "<u>Change of Control Payment</u>").

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) Within 30 days following the date upon which the Change of Control Triggering Event occurred, or at the Company's option, prior to any Change of Control but after the public announcement of the transaction that constitutes or may constitute the Change of Control, the Company will mail or send electronically pursuant to applicable DTC procedures a notice to each Holder of Notes, with a copy to the Trustee, which notice will govern the terms of the Change of Control Offer. Such notice will state, among other things, the purchase date, which must be no earlier than 10 days nor later than 60 days from the date such notice is mailed or sent, other than as may be required by law (the "<u>Change of Control Payment Date</u>"). The notice, if sent prior to the date of consummation of the Change of Control, will state that the Change of Control Offer is conditioned on the Change of Control being consummated on or prior to the Change of

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Control Payment Date. Holders of Notes electing to have Notes purchased pursuant to a Change of Control Offer will be required to surrender their Notes, with the form entitled "Option of Holder to Elect Purchase" on the reverse of the Note completed, to the Paying Agent at the address specified in the notice, or transfer their Notes to the Paying Agent by book-entry transfer pursuant to the applicable procedures of the Paying Agent, prior to the close of business on the third Business Day prior to the Change of Control Payment Date.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) On each Change of Control Payment Date, the Company will, to the extent lawful, (i) accept for payment all Notes or portions of Notes properly tendered pursuant to the applicable Change of Control Offer, (ii) deposit with the Paying Agent an amount equal to the Change of Control Payment in respect of all Notes or portions of Notes properly tendered pursuant to the applicable Change of Control Offer and (iii) deliver or cause to be delivered to the Trustee the Notes properly accepted together with an Officers' Certificate stating the aggregate principal amount of Notes or portions of Notes being repurchased.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) The Company will not be required to make a Change of Control Offer upon the occurrence of a Change of Control Triggering Event if a third party makes such an offer in the manner, at the times and otherwise in compliance with the requirements for such an offer made by the Company and such third party purchases all Notes properly tendered and not withdrawn under its offer.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(e) The Company will comply with the requirements of Rule 14e-1 under the Exchange Act, and any other securities laws and regulations thereunder to the extent those laws and regulations are applicable in connection with the repurchase of the Notes as a result of a Change of Control Triggering Event. To the extent that the provisions of any such securities laws or regulations conflict with the Change of Control Offer provisions of the Notes, the Company will comply with the applicable securities laws and regulations and will not be deemed to have breached its obligations under the Change of Control Offer provisions of the Notes by virtue of such conflicts.

**ARTICLE V** 

**COVENANTS** 

The covenants set forth in this Article V shall be applicable to the Company in addition to the covenants in Article III of the Indenture, which shall in all respects be applicable in respect of the Notes.

Section 5.01. <u>Limitation on Liens</u>.

The Company will not, and will not permit any Material Subsidiary to, create, assume or permit to exist, any Lien, other than Permitted Liens, on any Principal Property, now owned or hereafter acquired by the Company or any Subsidiary of the Company, to secure Debt, without effectively providing concurrently that the Notes are secured equally and ratably with such Debt, for so long as such Debt shall be so secured.

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"Permitted Liens" means:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) Liens existing on the date of the Indenture, or any Lien in favor of the Trustee for the benefit of Holders of the Notes;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) Liens in favor of the Company or Liens of Material Subsidiaries in favor of one of more Subsidiaries of the Company;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3) Liens on any property existing at the time the Company or a Material Subsidiary acquired or leased such property, including property acquired by the Company or a Material Subsidiary through a merger or similar transaction;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4) Liens on any Principal Property to secure all or part of the cost of acquisition, construction, development or improvement of such Principal Property, or to secure Debt incurred to provide funds for any such purposes, provided, that the commitment of the creditor to extend the credit secured by any such Lien shall have been obtained not later than 12 months after the later of (A) the completion of the acquisition, construction, development or improvement of such Principal Property and (B) the placing in operation of such Principal Property or of such Principal Property as so constructed, developed or improved;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(5) Liens on property of any Person existing at the time such Person becomes a Material Subsidiary;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(6) Liens imposed by law for taxes, assessments or charges of any governmental authority for claims which are not overdue for a period of more than 60 days, or to the extent that such Lien is being contested in good faith by appropriate actions and adequate reserves in accordance with GAAP are being maintained therefor;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(7) statutory Liens of landlords and Liens of carriers, warehousemen, mechanics, materialmen and other Liens imposed by law or created in the ordinary course of business which are not delinquent or remain payable without penalty or which are being contested in good faith by appropriate actions;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(8) Liens securing (i) the non-delinquent performance of bids, trade contracts (other than for borrowed money), leases or statutory obligations, (ii) surety bonds (excluding appeal bonds and other bonds posted in connection with court proceedings or judgments) and (iii) other non-delinquent obligations of a like nature (including those to secure health, safety and environmental obligations) in each case incurred in the ordinary course of business;

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(10) easements, rights-of-way, zoning or any other restrictions, encroachments, protrusions and other similar encumbrances on real property which in the aggregate do not materially detract from the value of such property or materially interfere with the ordinary conduct of the Company's businesses or the Subsidiaries' businesses, taken as a whole;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(11) Liens securing obligations in respect of Capital Leases on assets subject to such leases, provided that such leases are not otherwise prohibited;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(12) any Lien renewing, extending or replacing any Lien referred to above, to the extent that (a) the principal amount of the indebtedness secured by such Lien is not increased and (b) no assets encumbered by any such Lien other than the assets permitted to be encumbered immediately prior to such renewal, extension, refinance or refund are encumbered thereby;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(13) any other Lien on any of the Company's or its Subsidiaries' assets or properties that secure indebtedness, liabilities and obligations of the Company or its Subsidiaries in an aggregate amount at the time of the creation of such Lien that, together with the amount of such indebtedness, liabilities and obligations secured by other Liens pursuant to this clause at such time, does not exceed an amount equal to 15% of the Company's Consolidated Tangible Assets (determined as of the most recently ended fiscal quarter for which financial statements are available); or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(14) Liens arising under the Indenture in favor of the Trustee, in its capacity as such, for its own benefit and similar Liens in favor of other trustees, agents and representatives arising under instruments governing indebtedness permitted to be incurred under the Indenture; provided, however, that such Liens are solely for the benefit of the trustees, agents or representatives in their capacities as such and not for the benefit of the holders of such indebtedness.

Section 5.02. <u>Limitation on Sale and Leaseback Transactions</u>.

The Company will not, and will not permit any Material Subsidiary to, enter into any Sale and Leaseback Transaction covering any Principal Property owned by the Company or any Material Subsidiary. However, a Sale and Leaseback Transaction will not be prohibited if:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) the transaction is permitted pursuant to the exception described in clause (13) of the definition of "Permitted Liens" under Section 5.01;

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) the proceeds of the Sale and Leaseback Transaction are at least equal to the fair value (as determined by the Company's Board of Directors in good faith) of the Principal Property leased pursuant to such transaction and an amount equal to the greater of (i) the net proceeds of the sale or transfer and (ii) the Attributable Debt of the Principal Property sold (as determined by the Company) is applied within 180 days of the Sale and Leaseback Transaction to either (x) the purchase or acquisition of, or, in the case of real property, the commencement of construction on or improvement of, property or assets, or (y) the voluntary retirement or repayment (other than at maturity or pursuant to a mandatory sinking fund or mandatory redemption provision) of Funded Debt of the Company (other than indebtedness subordinated to the Notes) or a Material Subsidiary, for money borrowed, maturing more than 12 months after the voluntary retirement;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3) the lease is for a period not exceeding three years and by the end of which it is intended that the use of such Principal Property by the lessee will be discontinued; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4) the lease is with the Company or another Material Subsidiary.

Section 5.03. <u>Future</u> <u>Guarantors</u>.

The Company shall cause any Subsidiary of the Company that guarantees, directly or indirectly, any of the Existing Notes to at the same time, execute and deliver to the Trustee a supplement to the Indenture pursuant to which such Subsidiary will guarantee payment of the Notes and all other obligations of the Company on the same terms and conditions as those set forth in the Indenture. Thereafter, such Subsidiary shall be a Guarantor for all purposes of the Indenture until such Securities Guarantee is released in accordance with the provisions of the Indenture; provided that any Guarantor will be automatically and unconditionally released from all obligations under its Securities Guarantee, and such Securities Guarantee shall thereupon terminate and be discharged and of no further force and effect at such time as the relevant Guarantor no longer guarantees any of the Existing Notes.

**ARTICLE VI** 

**EVENTS OF DEFAULT** 

Section 6.01. The events of default in Article VI of the Indenture shall be applicable to the Notes. In addition, the following shall be Events of Default with respect to the Notes:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) an event of default under the terms of any indenture or instrument for borrowed money under which the Company or any of its subsidiaries has outstanding an aggregate principal amount of at least $100,000,000, which event of default results in an acceleration of the payment of all or a portion of such indebtedness for money borrowed prior to its stated maturity (which acceleration is not rescinded or annulled within 30 days after notice of such acceleration); and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) failure to make the Special Mandatory Redemption, if required in accordance with the terms of Section 3.02.

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**ARTICLE VII** 

**MISCELLANEOUS** 

Section 7.01. <u>Ratification of Indenture</u>.

This Sixth Supplemental Indenture is executed and shall be constructed as an indenture supplement to the Indenture, and as supplemented and modified hereby, the Indenture is in all respects ratified and confirmed, and the Indenture and this Sixth Supplemental Indenture shall be read, taken and constructed as one and the same instrument.

Section 7.02. <u>Trust Indenture Act Controls</u>.

If any provision of this Sixth Supplemental Indenture limits, qualifies or conflicts with another provision that is required or deemed to be included in this Sixth Supplemental Indenture by the TIA, the required or deemed provision shall control.

Section 7.03. <u>Notices</u>.

All notices and other communications shall be given as provided in the Indenture. However, with respect to notices or communications to be made or sent to the Trustee, they shall be addressed to:

U.S. Bank Trust Company, National Association

1255 Corporate Drive

6th Floor

Irving, TX 75038

Attn: Corporate Trust Administration

The Trustee shall have the right to accept and act upon any notice, instruction, or other communication, including any funds transfer instruction, (each, a "Notice") received pursuant to this Indenture by electronic transmission (including by e-mail, facsimile transmission, web portal or other electronic methods) and shall not have any duty to confirm that the person sending such Notice is, in fact, a person authorized to do so. Each other party to this Sixth Supplemental Indenture assumes all risks arising out of the use of electronic signatures and electronic methods to send Notices to the Trustee, including without limitation the risk of the Trustee acting on an unauthorized Notice and the risk of interception or misuse by third parties. Notwithstanding the foregoing, The Trustee may in any instance and in its sole discretion require that a Notice in the form of an original document bearing a manual signature be delivered to the Trustee in lieu of, or in addition to, any such electronic Notice.

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Section 7.04. <u>Governing Law</u>.

THIS SIXTH SUPPLEMENTAL INDENTURE AND THE NOTES SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO CONFLICTS OF LAWS PRINCIPLES THERETO. EACH OF THE COMPANY AND THE TRUSTEE HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS SIXTH SUPPLEMENTAL INDENTURE, THE NOTES OR THE TRANSACTION CONTEMPLATED HEREBY.

Section 7.05. <u>Successors</u>.

All agreements of the Company in this Sixth Supplemental Indenture and the Notes shall bind their successors. All agreements of the Trustee in this Sixth Supplemental Indenture shall bind its successors.

Section 7.06. <u>Multiple Originals</u>.

The parties may sign any number of copies of this Sixth Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. One signed copy is enough to prove this Sixth Supplemental Indenture. The exchange of copies of this Sixth Supplemental Indenture and of signature pages by facsimile or PDF transmission shall constitute effective execution and delivery of this Sixth Supplemental Indenture as to the parties hereto and may be used in lieu of the original Sixth Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes.

Section 7.07. <u>Headings</u>.

The headings of the Articles and Sections of this Sixth Supplemental Indenture have been inserted for convenience of reference only, are not intended to be considered a part hereof and shall not modify or restrict any of the terms or provisions hereof.

Section 7.08. <u>Trustee Not Responsible for Recitals</u>

The recitals contained herein shall be taken as statements of the Company and the Trustee does not assume any responsibility for their correctness. The Trustee makes no representations as to the validity or sufficiency of this Sixth Supplemental Indenture, except that the Trustee represents that it is duly authorized to execute and deliver this Sixth Supplemental Indenture and perform its obligations hereunder.

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IN WITNESS WHEREOF, the parties have caused this Sixth Supplemental Indenture to be duly executed as of the date first written above.

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| | | |
|:---|:---|:---|
| **COMPANY:** | **COMPANY:** | **COMPANY:** |
| FLOWSERVE CORPORATION | FLOWSERVE CORPORATION | FLOWSERVE CORPORATION |
| By: | /s/ Amy B. Schwetz | /s/ Amy B. Schwetz |
|  | Name: | Amy B. Schwetz |
|  | Title: | Senior Vice President, Chief Financial Officer |

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*Signature page to the Sixth Supplemental Indenture* 

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| | |
|:---|:---|
| **TRUSTEE:** | **TRUSTEE:** |
| U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee | U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee |
| By: | /s/ Michael K. Herberger |
|  | Name: Michael K. Herberger |
|  | Title: Vice President |

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*Signature page to the Sixth Supplemental Indenture* 

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**EXHIBIT A** 

**<u>FORM OF NOTE</u>**

THIS NOTE IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A NOMINEE THEREOF. THIS NOTE MAY NOT BE EXCHANGED IN WHOLE OR IN PART FOR A NOTE REGISTERED, AND NO TRANSFER OF THIS SECURITY IN WHOLE OR IN PART MAY BE REGISTERED, IN THE NAME OF ANY PERSON OTHER THAN SUCH DEPOSITARY OR A NOMINEE THEREOF, EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE.

UNLESS THIS NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY NOTE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO., OR SUCH OTHER NAME AS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY (AND ANY PAYMENT HEREON IS MADE TO CEDE & CO. OR SUCH OTHER ENTITY AS IS REQUESTED BY THE DEPOSITORY TRUST COMPANY), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL SINCE THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

CUSIP NO. 34354P AG0

ISIN NO. US34354PAG00

FLOWSERVE CORPORATION

5.700% SENIOR NOTE DUE 2036

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| | |
|:---|:---|
| $500000000 | No.: R-1 |

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FLOWSERVE CORPORATION, a New York corporation (herein called the "Company"), for value received, hereby promises to pay to CEDE & CO., or registered assigns, the principal sum of $500,000,000 or such other principal amount as shall be set forth on Schedule I hereto on May 15, 2036 and to pay interest thereon at the rate of 5.700% per annum from and including May 12, 2026, or from the most recent Interest Payment Date to which interest has been paid or duly provided for, on May 15 and November 15 of each year, commencing on November 15, 2026 (each, an "Interest Payment Date"), until the principal hereof is paid or made available for payment.

The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date will, except as provided in the Indenture hereinafter referred to, be paid to the Person in whose name this Note (or one or more predecessor Notes) is registered at the close of business on the regular record date for such interest, which will be the May 1 or November 1 (whether or not that date is a Business Day), as the case may be (each, a "Regular Record Date"), immediately preceding each Interest Payment Date. Any such

Exhibit A - Page 1

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interest not so punctually paid or duly provided for shall forthwith cease to be payable to the Holder on such Regular Record Date and either may be paid to the Person in whose name this Note (or one or more predecessor Notes) is registered at the close of business on a Special Record Date for the payment of such defaulted interest to be fixed by the Trustee, notice whereof shall be given to the Holders not less than ten days prior to such Special Record Date, or may be paid at any time in any other lawful manner, all as more fully provided in the Indenture. Payment of the principal of and interest on this Note (including, without limitation, any Redemption Price or purchase price relating to a Change of Control Offer) will be made at the office or agency of the Company maintained for that purpose pursuant to the Indenture (initially the principal corporate trust office of the Trustee in New York, NY (the "Corporate Trust Office")), in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts; *provided, however*, that payment of interest may be made at the option of the Company (i) by check mailed to the address of the Person entitled thereto as such address shall appear in the Securities Register or (ii) by wire transfer to an account maintained by the Person entitled thereto as specified in the Securities Register. Payments of principal and interest at maturity will be made against presentation of this Note at the Corporate Trust Office (or such other office as may be established pursuant to the Indenture), by check or wire transfer.

Reference is hereby made to the further provisions of this Note set forth on the reverse side hereof, which further provisions shall for all purposes have the same effect as though fully set forth at this place.

Unless the Certificate of Authentication hereon has been executed by the Trustee or an authenticating agent under the Indenture referred to on the reverse hereof by the manual signature of one of its authorized officers, this Note shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose.

*[Signature Pages Follow]* 

Exhibit A - Page 2

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IN WITNESS WHEREOF, the Company has caused this Note to be to be duly executed as of the date set forth below.

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| | | |
|:---|:---|:---|
| Date: |  |  |
|  | FLOWSERVE CORPORATION | FLOWSERVE CORPORATION |
|  | By: |  |
|  |  | Name: |
|  |  | Title: |

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Exhibit A - Page 3

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Trustee's Certificate of Authentication

This is one of the Securities of the series designated therein referred to in the within-mentioned Indenture.

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| | | |
|:---|:---|:---|
| Dated: |  |  |
|  | U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, | U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, |
|  | as Trustee | as Trustee |
|  | By: |  |
|  |  | Authorized Signatory |

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Exhibit A - Page 4

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(Reverse of Note)

FLOWSERVE CORPORATION

5.700% SENIOR NOTE DUE 2036

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. This Note is one of a duly authorized issue of securities of the Company designated as its 5.700% Senior Notes due 2036 (the "Notes") unlimited in aggregate principal amount issued and to be issued under an indenture, dated as of September 11, 2012, between the Company and U.S. Bank Trust Company, National Association (as successor-in-interest to U.S. Bank National Association), as trustee (herein called the "Trustee," which term includes any successor Trustee under the Indenture), and the sixth supplemental indenture, dated as of May 12, 2026 (the indenture, as so supplemented and as it may be further supplemented or amended from time to time, is herein referred to as the "Indenture"), between the Company and the Trustee. Reference is hereby made to the Indenture for a statement of the respective rights thereunder of the Company, the Trustee and the Holders of the Notes, and the terms upon which the Notes are, and are to be, authenticated and delivered. The indebtedness of the Company evidenced by the Notes, including the principal thereof and interest thereon (including post-default interest), will constitute unsecured and unsubordinated indebtedness of the Company and will rank equally in right of payment with all of the Company's current and future unsecured and unsubordinated indebtedness.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. Prior to February 15, 2036 (the "Par Call Date"), the Company may redeem the Notes at the Company's option, in whole or in part, at any time and from time to time, at a Redemption Price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) (1) the sum of the present values of the remaining scheduled payments of principal and interest thereon
discounted to the Redemption Date (assuming the Notes matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months)
at the Treasury Rate plus 20 basis points less (2) interest accrued to the Redemption Date, and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) 100% of the principal amount of the Notes to be redeemed,

plus, in either case, accrued and unpaid interest thereon to the Redemption Date.

On or after the Par Call Date, the Company may redeem the Notes, in whole or in part, at any time and from time to time, at a Redemption Price equal to 100% of the principal amount of the Notes being redeemed plus accrued and unpaid interest thereon to the Redemption Date.

The Company's actions and determinations in determining the Redemption Price shall be conclusive and binding for all purposes, absent manifest error.

Exhibit A - Page 5

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. This Note shall be subject to Special Mandatory Redemption as described in Section 3.02 of the Sixth Supplemental Indenture.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4. Upon the occurrence of a Change of Control Triggering Event, unless the Company has given written notice with respect to a redemption of the Notes pursuant to paragraph 2 of this Note, each Holder of Notes will have the right to require the Company to purchase all or a portion of such Holder's Notes pursuant to the Change of Control Offer, at a purchase price equal to 101% of the principal amount thereof plus accrued and unpaid interest, if any, to the date of purchase.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5. If an Event of Default with respect to the Notes shall occur and be continuing, the principal of the Notes may be declared due and payable in the manner and with the effect provided in the Indenture.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6. The Indenture permits, with certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Company and the rights of the Holders of Notes under the Indenture at any time by the Company and the Trustee with the consent of the Holders of a majority in aggregate principal amount of Notes at the time outstanding. The Indenture also contains provisions permitting the Holders of a majority in aggregate principal amount of Notes at the time outstanding, on behalf of the Holders of all Notes, to waive compliance by the Company with certain provisions of the Indenture and certain past defaults under the Indenture and their consequences. Any such consent or waiver by the Holder of this Note shall be conclusive and binding upon such Holder and upon all future Holders of this Note and of any Note issued upon the registration of transfer hereof or in exchange therefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Note.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7. No reference herein to the Indenture and no provisions of this Note or of the Indenture shall alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of and interest on this Note at the times, places and rate, and in the coin or currency, herein prescribed.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8. As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Note may be registered on the Securities Register of the Company, upon surrender of this Note for registration of transfer at the Corporate Trust Office, duly endorsed by, or accompanied by a written instruction of transfer in form satisfactory to the Company, and duly executed by the Holder hereof or such Holder's attorney, duly authorized in writing, on which instruction the Company can rely, and thereupon one or more new Notes, of authorized denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9. The Notes are issuable only in fully registered form, without coupons, in minimum denominations of $2,000 or any amount in excess thereof which is an integral multiple of $1,000. As provided in the Indenture, and subject to certain limitations therein set forth, the Notes are exchangeable for a like aggregate principal amount of Notes in authorized denominations, as requested by the Holder surrendering the same.

Exhibit A - Page 6

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10. No service charge shall be made to the Holder for any such registration of transfer or exchange, but the Company may require payment of a sum sufficient to cover any transfer tax or similar governmental charge payable in connection therewith.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11. Prior to the due presentment of this Note for registration of transfer or exchange, the Company, the Trustee and any agent of the Company or the Trustee may treat the Person in whose name this Note is registered as the owner hereof for all purposes, whether or not this Note be overdue, and neither the Company, the Trustee, nor any such agent shall be affected by notice to the contrary.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;12. Interest on the Notes shall be computed on the basis of a 360-day year consisting of twelve 30-day months.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;13. The Trustee, in its individual or any other capacity, may make loans to, accept deposits from, and perform services for the Company or its Affiliates, and may otherwise deal with the Company or its Affiliates, as if it were not the Trustee.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;14. No past, present or future director, manager, officer, employee, incorporator, member, partner, stockholder or other owner of Capital Stock of the Company shall have any liability for any obligations of the Company under the Notes, the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder of Notes by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Notes. The waiver and release may not be effective to waive or release liabilities under the federal securities laws.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;15. This Note shall not be valid until authenticated by the manual signature of the Trustee or an authenticating agent.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;16. Customary abbreviations may be used in the name of a Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT (= tenants by the entireties), JT TEN (= joint tenants with right of survivorship and not as tenants in common), CUT (= Custodian), and U/G/M/A (= Uniform Gifts to Minors Act).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;17. Each Holder of this Note covenants and agrees by such Holder's acceptance thereof to comply with and be bound by the foregoing provisions.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;18. THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO CONFLICTS OF LAWS PRINCIPLES THERETO. EACH OF THE COMPANY AND THE TRUSTEE HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS NOTE.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;19. All capitalized terms used in this Note which are defined in the Indenture shall have the meanings assigned to them in the Indenture.

Exhibit A - Page 7

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**ASSIGNMENT FORM** 

FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and transfer(s) unto

PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE

PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS INCLUDING POSTAL ZIP CODE OF ASSIGNEE

the within Security and all rights thereunder, hereby irrevocably constituting and appointing attorney to transfer said Security on the books of the Company, with full power of substitution in the premises.

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| Dated: |
| Signature: |

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NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE WITHIN INSTRUMENT IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.

Signature Guarantee:

SIGNATURE GUARANTEE

Signatures must be guaranteed by an "eligible guarantor institution" meeting the requirements of the Registrar, which requirements include membership or participation in the Security Transfer Agent Medallion Program ("STAMP") or such other "signature guarantee program" as may be determined by the Registrar in addition to, or in substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934, as amended.

Exhibit A - Page 8

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OPTION OF HOLDER TO ELECT PURCHASE

If you want to elect to have this Note purchased by the Company pursuant to Section 4.01 of the Sixth Supplemental Indenture, check the box:

![LOGO](g133335g0512003737219.jpg)

If you want to elect to have only part of this Note purchased by the Company pursuant to Section 4.01 of the Sixth Supplemental Indenture, state the amount in principal amount: $_______________

Dated:<u> </u> Your Signature:<u> </u> <br> (Sign exactly as your name appears on the other side of this Note.)

Signature Guarantee: <br> (Signature must be guaranteed)

Signatures must be guaranteed by an "eligible guarantor institution" meeting the requirements of the Registrar, which requirements include membership or participation in the Security Transfer Agent Medallion Program ("STAMP") or such other "signature guarantee program" as may be determined by the Registrar in addition to, or in substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934, as amended.

Exhibit A - Page 9

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Schedule I

<u>SCHEDULE OF TRANSFERS AND EXCHANGES</u> 

The following increases or decreases in principal amount of this Global Security have been made:

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| | | | | |
|:---|:---|:---|:---|:---|
| **Date of Exchange** | **Amount of<br>Decrease in<br>Principal<br>Amount of this<br>Global Security** | **Amount of<br>Increase in<br>Principal Amount<br>of this Global<br>Security** | **Principal Amount<br>of this Global<br>Security following<br>such Decrease or<br>Increase** | **Signature of<br>Authorized<br>Signatory of<br>trustee or<br>Custodian** |

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Exhibit A – Schedule I

## Exhibit 5.1

**Exhibit 5.1**![LOGO](g133335g0508212653219.jpg)

May 12, 2026

Flowserve Corporation

5215 N. O'Connor Blvd. Suite 700

Irving, Texas 75039

Re: Flowserve Corporation

Registration Statement on Form S-3 (File No. 333-286219)

Ladies and Gentlemen:

We have acted as counsel to Flowserve Corporation, a New York corporation (the "<u>Company</u>"), in connection with the preparation and filing with the Securities and Exchange Commission (the "<u>Commission</u>") of the prospectus supplement, dated May 5, 2026, together with the prospectus included in the Registration Statement on Form S-3, file no. 333-286219, filed with the Commission on March 28, 2025 (the "<u>Prospectus Supplement</u>") pursuant to Rule 424(b) of the Securities Act of 1933, as amended (the "<u>Securities Act</u>"), and the offering by the Company pursuant thereto of $500,000,000 aggregate principal amount of the Company's 5.700% Senior Notes due 2036 (the "<u>Notes</u>").

The Notes have been issued pursuant to the Indenture, dated as of September 11, 2012 (the "<u>Base Indenture</u>"), between the Company and U.S. Bank Trust Company, National Association (as successor-in-interest to U.S. Bank National Association), as trustee (the "<u>Trustee</u>"), as supplemented by the Sixth Supplemental Indenture, dated May 12, 2026, relating to the Notes (the "<u>Supplemental Indenture</u>" and together with the Base Indenture, the "<u>Indenture</u>") between the Company and the Trustee.

In arriving at the opinion expressed below, we have examined originals, or copies certified or otherwise identified to our satisfaction as being true and complete copies of the originals, of the Base Indenture, the Supplemental Indenture and the Notes and such other documents, corporate records, certificates of officers of the Company and of public officials and other instruments as we have deemed necessary or advisable to enable us to render this opinion. In our examination, we have assumed, without independent investigation, the genuineness of all signatures, the legal capacity and competency of all natural persons, the authenticity of all documents submitted to us as originals and the conformity to original documents of all documents submitted to us as copies. As to any facts material to this opinion, we have relied to the extent we deemed appropriate and without independent investigation upon statements and representations of officers and other representatives of the Company and others.

Based upon the foregoing, and subject to the assumptions, exceptions, qualifications and limitations set forth herein, we are of the opinion that the Notes are legal, valid and binding obligations of the Company, enforceable against the Company in accordance with their respective terms.

**Gibson, Dunn & Crutcher LLP** 

2001 Ross Avenue Suite 2100 \| Dallas, TX 75201-2923 \| T: 214.698.3100 \| F: 214.571.2900 \| gibsondunn.com

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![LOGO](g133335g0508212653219.jpg)

May 12, 2026

The opinion expressed above is subject to the following additional exceptions, qualifications, limitations and assumptions:

A. We render no opinion herein as to matters involving the laws of any jurisdiction other than the State of New York and the United States of America. This opinion is limited to the effect of the current state of the laws of the State of New York, the laws of the United States of America and the facts as they currently exist. We assume no obligation to revise or supplement this opinion in the event of future changes in such laws or the interpretations thereof or such facts.

B. The opinion above is subject to (i) the effect of any bankruptcy, insolvency, reorganization, moratorium, arrangement or similar laws affecting the rights and remedies of creditors' generally, including without limitation the effect of statutory or other laws regarding fraudulent transfers or preferential transfers, and (ii) general principles of equity, including without limitation concepts of materiality, reasonableness, good faith and fair dealing and the possible unavailability of specific performance, injunctive relief or other equitable remedies regardless of whether enforceability is considered in a proceeding in equity or at law.

We consent to the filing of this opinion as an exhibit to a Current Report on Form 8-K, and we further consent to the use of our name under the caption "Legal Matters" in the Prospectus Supplement. In giving these consents, we do not thereby admit that we are within the category of persons whose consent is required under Section 7 of the Securities Act or the rules and regulations of the Commission promulgated thereunder.

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|:---|
| Very truly yours, |
| /s/ Gibson, Dunn & Crutcher LLP |

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