No.
: SE-20026-2
Issued on : Aug. 31 2023

Instruction Manual
Pearl Swivel Joint
PK Series
This instruction manual applies to products with type designations thatbegin with PK. (This manual does not apply to movable pipelines or products that
include flanges for connection.)

This instruction manual describes important precautions for preventing
accidents and how to handle the product. To ensure safe use, be sure toread this manual and fully understand its contents before using this product.
Store this manual carefully so that it can be referred to at any time.

Pearl is a trade name of Showa Giken Industrial Co., Ltd.

1

Table of Contents
1. How to Read Nameplate (Nameplate Information) …………………………………………… P3
P3
2. For Safety ……………………………………………………………………………………… P3
P32‐1）Symbols …………………………………………………………………………………… P3
P32‐2）For safe use ……………………………………………………………………………… P3
P3
3. Product Overview ……………………………………………………………………………… P43‐1）Application ………………………………………………………………………………… P43‐2）Information indicated by model names …………………………………………………… P43‐3）Service conditions ………………………………………………………………………… P5P53‐4）Precautions for use ………………………………………………………………………… P5
3‐5）Product structures and materials ………………………………………………………… P6
P53‐6）Product dimensions ………………………………………………………………………… P6
P73‐7）Product masses …………………………………………………………………………… P6P73‐8）Product torque ……………………………………………………………………………… P6
P8
4. Transport and Storage ………………………………………………………………………… P7P94‐1）Transport …………………………………………………………………………………… P7P94‐2）Storage ……………………………………………………………………………………… P7P9
5. Installation …………………………………………………………………………………………P9P7
6. Removal …………………………………………………………………………………………...P12P8
7. Operation ……………………………………………………………………………………… P13
P87‐1）Operation …………………………………………………………………………………… P13
P87‐2）Operation shutdown ……………………………………………………………………… P13
P8
8. Inspection and Maintenance …………………………………………………………………… P14P98‐1）Daily inspection …………………………………………………………………………… P14P98‐2）Greasing …………………………………………………………………………………… P14P98‐3）Repair and replacement of consumables ………………………………………………… P15
P9
9. Troubleshooting ………………………………………………………………………………… P16
P10
10. Disposal ……………………………………………………………………………………… P17
P11
11. Product Warranty …………………………………………………………………………… P17
P11
A. Appendix - How to Repair or Replace Consumables ………………………………………… P19
P132

1. How to Read Nameplate (Nameplate Information)
Ｍｏｄｅｌ Ｎａｍｅ

Ｍａｎｕｆａｃｔｕｒｉｎｇ Ｎｏ．

Ｍａｎｕｆａｃｔｕｒｉｎｇ Ｄａｔｅ

The nameplate attached to the product indicates the model name, manufacturing number, andmanufacturing date.
( Only model name is indicated for the products produced in or before February, 2020)

2. For Safety2‐1) Symbols
The symbols used in this instruction manual are described below.

WARNING

Indicates that failure to follow the warning message may cause bodily
accidents that may result in serious or even fatal injury.

CAUTION

Indicates that failure to follow the caution message may cause
personal injury or damage to peripheral equipment.

Instruction Indicates that failure to follow the instruction message may cause
reduced product lifetime, product damage, or early leakage.
Indicates “prohibited actions”.
2‐2) For safe use
1. Transport, storage, installation, piping, operation, or maintenance of this product should be
carried out by an experienced expert.
2. Be sure to observe all warnings, cautions, and instructions described in each section.
3.
Never disassemble or modify this product because doing so is dangerous. We shall assume
no responsibility for any malfunctions, accidents, or the results thereof involving areassembled product after disassembly or a modified product. Also, a reassembled product after
disassembly or a modified product shall not be covered by the product warranty even if thewarranty period is still valid. This also applies to repairs done by yourself.
4. Confirm specifications (dimensions, materials, masses) indicated on individual product drawings
before staring work. Contact our sales representative for requests for product drawings.
5. Always use the latest instruction manual. You can download the latest version from our website.

33. Product Overview
3‐1) Application
A swivel joint is used when it is necessary to rotate a pipe for transporting fluid or move it
up/down, left/right, or forward/backward.

3‐2) Information indicated by model names
Information indicated by each series model names is described below.
The product list is shown in our catalog or on our website.

Note 1) “␣” indicates a space. A model name is indicated without spaces.
2) If two or more option (part change/addition) codes are selected, they are indicated inalphabetical order.
3) Option (part change/addition) code X is applicable to sizes 15A to 40A.
If you have any questions, contact our sales representative.

43‐3) Service conditions
Service Conditions of PK Series
Material(main parts)

SeriesConnection

PK

Taper Thread Ductile Cast Iron
(Rc/R)
BronzeSeal Ring

Style

Size

Pressure
(MPa)

Max.
Temperature
(℃)

PTFE

1～4

15A～50A

2.3

2303‐4) Precautions for use
Use this product by following the warnings and instructions described below.

WARNING

1. If flammable fluids leak and ignite, bodily accidents including serious oreven fatal injury, or accidents that damage peripheral equipment may
occur due to explosion or fire. Depending on the type of fluid, thisproduct may subject to restrictions due to national laws or local
regulations.
2.
This product cannot be used for food-processing machinery.
Doing so may lead to adverse health effects.
1. Perform operation within the service conditions.
2.
The product cannot be used for fluid that causes corrosion on it.

Instruction

3.

The use of the product in a continuous rotation condition is not
appropriate. The product lifetime becomes shortened.
4. Although the shaft rotates 360° in the swivel direction, the upper limit of its
self-aligning angle is 6° (±3°). When introducing a hose for connecting the
product or a movable pipeline for using multiple products, carefully consider
the motion of the hose and the movable pipeline before selecting a style.

3‐5) Product structures and materials

PK

Materials of Main Components(Standard Specification)
Part Name
Shaft
Body
Cover
Seal Ring

Material
BronzeDuctile Cast Iron
Carbon Steel
Ductile Cast Iron
PTFE

Heat-resistant paint is applied toexternal parts.

Note ) Component materials are indicated on product drawings.
Contact our sales representative for requests for product drawings.

53‐6) Product dimensions
Product dimensions are shown on product drawings, in our catalog, or on our website.

3‐7) Product masses
Masses of PK Series
Size
15A
20A
25A
32A
40A
50A

(kg)

Style
1
1.1
1.8
2.8
4.2
5.2
8.0

2
1.0
1.5
2.4
3.6
4.8
7.1

3
1.0
1.6
2.6
4.0
4.9
7.8

4
1.0
1.6
2.5
3.9
5.0
7.0

3‐8）Product torque＊Dynamic torque varies depending on product storage conditions, storage period, or fluid types.
＊Starting torque is larger than dynamic torque. Although starting torque is even larger whenwringing occurs, it does not indicate any fault.
＊Data are typical values measured based on in-house test standards. They are not guaranteed values.

64. Transport and Storage4‐1) Transport
Transport this product by following the instructions described below.

Instruction

Do not subject the product to undue impact while it is being transported. Falling
down or impact causes product damage or early leakage. If the product fell downor was damaged, contact us for maintenance.

4‐2) Storage
An improper storage method causes product damage or early leakage.
Store this product by following the instructions described below.

Instruction

1. Wrap the product before storing it to prevent the entry of foreign objects.
2. Store this product in a dry environment at 10℃ to 40℃.
3. The storage period should be within two years. If the storage period exceeds
two years, contact us for maintenance.
4. If the product is stored after use, clean and then store it under the above
conditions.

5. Installation
Product adjustment is not required before installation.
Install the product by following the instructions described below.

Instruction

1. Thoroughly flush flow passages to remove foreign objects before productinstallation. If the fluid contains foreign objects, install a strainer at the flow
passages. Foreign objects cause early leakage.
2.
Avoid such pipe laying that excessive force is applied in the direction of
pushing the shaft towards the body. Failure to do so may reduce the seal
face pressure or open the seal face, causing fluid leakage.
3. When tightening screws, properly torque-tighten them according to their sizes.
4. Perform retightening after the start of use.

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6. Removal
Perform removal by following the warnings described below.

WARNING

In order to prevent bodily accidents due to residual fluid in the product orpipes, remove the product after fluid has been completely drained from theproduct or pipes and temperature has dropped to room temperature.

7. Operation
7‐1) Operation
Perform operation by following the warnings and cautions described below.

WARNING

Immediately stop operation if fluid leakage is detected during operation.
If operation is continued with fluid leakage not being repaired, serious
accidents including bodily accidents may result.

During rotation or high-temperature/pressure fluid flow, keep wellaway from the product to prevent injuries or burns. Do not directly
touch rotating or hot parts during operation.

CAUTION7‐2) Operation shutdown

Follow the following instructions during operation shutdown.

Instruction

Do not put your hand on or ride on the product during equipment
maintenance. Doing so may cause product damage or fluid leakage after
operation restart.

88. Inspection and Maintenance8‐1) Daily inspection
Perform inspection according to the following instructions.

Instruction

1. Visually check connections and the product for fluid leakage. If leakage is
detected, repair the product or replace it with a new one.
2. When replacing, use the same type of product with the same size.

8-2) Greasing
Greasing is not required for the PK series.

8‐3) Repair and replacement of consumables
Over the course of operation time, the seal ring is worn out or deteriorates, and then such
malfunctions as fluid leakage may occur. However, the product can be reused by repairing or
replacing worn or deteriorated parts.
Contact us for repair or parts replacement. We carry it out according to our repair program.
Depending on the products, expenses for purchasing new products may be lower than repair expenses.
Consult with us when requesting repair or replacement.
< When carrying out repair or replacement of consumables by yourself >・ Repair or replacement should be carried out by an experienced expert.
・ Perform work according to “A. Appendix - How to Repair or Replace Consumables".
・ Use our genuine parts as replacement parts.
Contact our sales representative to request genuine parts.

・ Properly dispose of waste resulting from work according to national laws or local government
regulations or ordinances.
(Attention)
If you carry out repair or replacement, we shall assume no responsibility for any productmalfunctions, equipment malfunctions or accidents resulting from such product or the results
thereof. Also, the product shall not be covered by the product warranty even if the warranty
period is still valid.

99. TroubleshootingThis section describes the possible causes of and countermeasures against malfunctions.
If a problem persists, contact our sales representative for assistance.
Malfunctions

Fluid is leaking.

CausesCountermeasures

The seal ring is deformed or damaged.
The seal ring lifetime has been reached.

Contact us for repair.
Alternatively, replace with a new one.

The fluid contains foreign objects.

Clean the inside of the product and pipes.
Install a strainer.

Force is applied in the direction of pushing the shaft
towards the body. (＊1)

Review the pipe laying method.

The shaft inclination exceed the angle within which
self-aligning can be performed. (＊2)

Review the pipe laying method.

The pipe centers of the movable and stationary sides
Review the pipe laying method.
are misaligned with each other. (＊3)
The shaft does not rotate.
Sticking of fluid (that has ability to solidify).
(Starting torque is high.)
Lifetime is shortened.

After using the product, clean its inside toremove foreign objects.

The product is used in consecutive rotation condition Consult with us. (The selected productor at high-rotation speed.
may be inappropriate.)(＊1) The shaft is pushed against the seal ring by the spring and fluid pressure, thus allowing the seal faceto function. Applying force to the shaft in the direction towards the body reduces the seal facepressure, causing fluid leakage.
(＊2) Self-aligning can be performed within 6° (±3°).
(＊3) Although angle deviation within 6° between the movable and stationary sides can be accommodated,center misalignment (offset) cannot be accommodated.

1010. Disposal
When disposing of packaging materials or products, properly dispose of them according tonational laws or local government regulations or ordinances.

11. Product Warranty
If a malfunction occurs during the warranty period, contact us or the distributor and send the
product to us. Be sure to carefully pack the product for protection before sending it.
After receiving the product, we will confirm the malfunction. If the malfunction was clearly causedby the materials of product components or the manufacturing method, we will repair the productin question or replace it with a new one free of charge.

Product Warranty Provision
1. Warranty period<New products>
One (1) year and six (6) months after shipment (from the manufacturing date) or one (1) year
after installation, whichever comes first.
<Repaired products>
Six (6) months after shipment (from the manufacturing date).
2. We charge a fee for repairs in any of the following cases.
①Failure after the warranty period has expired②Failure caused by use of the product deviating from the service conditions③Failure caused by misuse(improper storage, installation, pipe laying, operation or maintenance, etc.)④Failure caused by fluid contaminants or foreign objects in the fluid⑤Failure caused by relocation, transport, or falling of the product after delivery⑥Failure caused by disassembly, repair, or modification done by personnel other than our service
personnel⑦Failure of the product attributed to using materials or according to standards specified by thecustomer⑧Failure of the product attributed to using materials provided by the customer⑨Failure caused due to unavoidable acts of nature such as fires or other natural disasters
3. Scope of responsibility
Our responsibility shall be limited to repairs, replacements, or transport expenses covered by thisproduct warranty provision. Expenses or damages caused by said failures above shall not becovered.
4. Applicable regions
This product warranty provision shall be applicable to products installed in Japan.
Contact our sales representative if you install and use our products outside Japan.
5. Another agreement
If another product warranty agreement is made separately with us and clearly states that said
agreement shall have priority over this product warranty provision, this provision shall not beapplicable.
6. This product warranty provision shall not restrict the customer's legal rights.

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URL https://www.sgk-p.co.jp
Export Department

Phone : +81-3-3598-1400 Fax. : +81-3-3598-2700
E-mail : sgk-tk@sgk-p.co.jp
Headquarters
7-24, Nishi-Kobari, Ina-Machi, Saitama, 362-0811 Japan
Phone : +81-48-728-9460 Fax. : +81-48-728-9461
Tokyo Sales Office
2-64-11, Akabane, Kita-ku, Tokyo, 115-0045 Japan
Phone : +81-3-3598-1400 Fax. : +81-3-3598-2700
Osaka Sales Office
2-9-7, Toyosaki, Kita-ku, Osaka, 531-0072 Japan
Phone : +81-6-6371-8341 Fax. +81-6-6371-6283
Nagoya Sales Office 41-1, Higashi-Ozone-cho, Higashi-ku, Nagoya, 461-0022 Japan
Phone : +81-52-938-8825 Fax. : +81-52-938-6423

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A. Appendix - How to Repair or Replace Consumables

13

２

５

６

４

３

７ ８

１

①Shaft ②Body ③Cover ④Seal Ring ⑤Spring Seat ⑥Spring⑦Hex. Bolt ⑧Spring Washer< Disassembly >Carefully disassemble the product so that each part is not damaged.
1) Clamp body ② with a vice, etc. so that shaft ① faces upward.
2) Remove hex. bolts ⑦ together with spring washers ⑧, and then remove cover ③ from body ②.
3) Remove seal ring ④, shaft ①, spring ⑥, and spring seat ⑤ from body ②.
< Inspection >Clean each part and check for damage. In particular, check the degree of wear and damage on theseal faces of shaft ① and seal ring ④.
< Repair and parts replacement >1) Shaft ① may be reused by repairing its seal face in case of minor damage.
2) Replace seal ring ④ with a new one regardless of its condition.
3) If repair or reuse of parts is impossible, replace them with our new genuine parts.
Contact our sales representative to request genuine parts.

SHOWA GIKEN INDUSTRIAL CO., LTD

https://www.sgk-p.co.jp

7-24, Nishi-Kobari, Ina-Machi, Saitama, 362-0811 Japan 14
Phone : +81-48-728-9460
Fax. : +81-48-728-9461

< Assembly >Assemble the product in the reverse order of disassembly.
Carefully assemble the product so that each part is not damaged. In particular, be careful not todamage the seal faces. If dust adheres to the seal face, wipe it off with thinner.
1) Clamp body ② with a vice, etc. so that the shaft side faces upward.
2) Install spring seat ⑤, spring ⑥, shaft ①, and seal ring ④ to body ②.
3) Install cover ③ to body ②, and evenly tighten hex. bolts ⑦ together with spring washers ⑧ ina cross pattern to secure cover ③.
4) Turn shaft ① a few turns clockwise/counterclockwise to make sure there is no fault.

Phone : +81-3-3598-1400 (Export Department) Phone : +81-3-3598-1400 (Tokyo Office)Phone : +81-6-6371-8341 (Osaka Office)Phone : +81-52-938-8825 (Nagoya Office)15