Bulletin 71.4:EZR
03/01

Type EZR Relief Valve or
Backpressure Regulator

 Internally Actuated Quiet Operation

 Exceptional Design

 Thoroughly Tested

 Robust Construction
W7393

Patent Numbers 5,964,446 and 6,102,071
Additional Patents Pending

Regulators

www.FISHERregulators.com

D102627X012

 1, 2, 3, 4 and 6-inch (DN 25, 50,
80, 100 and 150) Body Sizes

Bulletin 71.4:EZR
FeaturesEasy In-Line Maintenance—Top-entry design reduces
maintenance time. Trim parts can be inspected,
cleaned, and replaced without removing the body fromthe pipeline. No special alignment is required whenreplacing the diaphragm. The Type EZR incorporates
Fisher E-body construction, making it easy to change
out existing Fisher E-body relief valves andbackpressure regulators with a Type EZR trim kit.

INDICATORPROTECTOR

W7398

TYPE EZR TRIM PACKAGECAP SCREWS

Quiet Operation—The specially engineered flow path
reduces operational noise, making the Type EZR
exceptionally quiet.

HEX NUTS

INDICATOR COVER

INDICATORWASHER
INDICATOR FITING

O-Ring Design—The Type EZR uses elastomer Orings instead of gaskets, reducing maintenance andassembly time.

BONNET

O-RING

MAIN SPRING

Versatility—By changing from a relief piloting system
to a pressure reducing piloting system, a Type EZR relief
valve or backpressure regulator easily becomes apressure reducing regulator.

STEM
O-RING
DIAPHRAGM AND
PLUG ASSEMBLYCAGELong Life—The robust design of the Type EZR with its
metal plug and specially engineered flow path allows flow
through the regulator without seat impingement. The
diaphragm design eliminates the possibility of taking a"set", a common problem with boot-style regulators. To
prevent damage, the diaphragm is fully supported in boththe open and closed positions. These features enable theType EZR components to work longer with less wear.

Full Usable Capacity—Fisher relief valves andbackpressure regulators are laboratory tested. 100
percent of the published capacities can be used withconfidence.

2

O-RINGINLETSTRAINER

MAIN VALVE BODY
(E-BODY)
B2615

Bulletin 71.4:EZR
Fast Pilot Reseat—The fixed restriction in the Type 6358B, 6358EB, and6358EBH pilots allows the valve plug
to quickly reseat after operation.

UPPER SPRING SEATINDICATOR STEM

INDICATOR FITTING
INDICATOR COVER
O-RING

MAIN SPRINGHEX NUTS

W7400_1

BACKUPRINGS

INDICATORWASHER

INDICATOR
O-RINGWASHER(6-INCH SIZE ONLY)TRAVEL INDICATOR ASSEMBLY

Tight Shutoff—The Type EZR uses adiaphragm and metal plug, eliminating thedisadvantages of the boot-style relief valves
and backpressure regulators. When open,
the metal plug deflects particles and debris
away from the diaphragm. The result isenhanced resistance to particle erosion
which provides excellent shutoff over an
extended life. When closed, loading pressure and the main spring push the diaphragm onto the knife edged seat on thecage to maintain tight shutoff.

Thorough Laboratory Testing—Fisher's state-of-the-art flow laboratory
allows thorough testing of all new
designs. Fisher conducts performance
tests such as flow, shutoff, material
compatibility, and noise abatement.

Debris Protection—The specially engineered flow
path, along with the metal plug, allow flow through the
body without seat impingement.

Diaphragm

Top Plug

Bottom PlugO-RingPowder Paint Coating—Fisher products are
powder paint coated, offering impact,abrasion, and corrosion resistance.

O-Ring
W7394

O-RingFlangedLocknut

DIAPHRAGM AND PLUG ASSEMBLY

Introduction
The Type EZR pilot-operated, pressure relief valve orbackpressure regulator is typically used in city gate
and district stations as a relief valve for overpressure
protection, or in commercial and industrial applications
as a backpressure regulator. The Type EZR provides
smooth, quiet operation, tight shutoff, and long life,

even in dirty service. Its internally actuated metal plugeliminates disadvantages associated with boot-stylerelief valves and backpressure regulators. The speciallyengineered flow path deflects debris, protecting the seatfrom damage and erosion. The Type EZR relief valve orbackpressure regulator can be converted to a pressure
reducing regulator simply by changing to a pressure
reducing piloting system (see Bulletin 71.2:EZR).

3

Bulletin 71.4:EZR
Specifications
Main Valve Body Sizes, End Connection Styles, andBody Ratings(1)See table 1
Maximum Relief (Inlet) Pressure(1)See tables 2 and 6
Minimum Relief Set Pressure(2)20 psig (1,4 bar)Set Pressure Ranges
See table 2
Main Valve Flow Coefficients
See table 8
Diaphragm Selection(1)See tables 4, 5, and 6
Reseat Pressures
See table 7
Main Valve Flow Direction
Up through the center of the cage down throughcage slots
Typical Main Valve Flow Capacities
See table 9; and Capacity Information
Main Valve Flow Characteristics
LinearNoise Information
See the Noise Abatement Technology section
Pressure Registration
External through upstream control line
Upstream Control Line Connection
1/4-inch NPT screwed in pilot body
Pilot Spring Case Vent Connection
1/4-inch NPT screwed tapping
Temperature Capabilities(1)See table 5
Approximate Weights
See table 10
Options• Prepiped Pilot Supply and Pilot Bleed• Travel Indicator• Inlet Strainer• Type 252 Pilot Supply Filter• Trim Package• Quick Disconnect Union in Pilot Mounting

Construction Materials
Type EZR Main Valve
Body: Cast iron or WCB steel
Bonnet: LF2 Steel
Bonnet Bushing: S41600 Stainless steel
Cage: 15-5 Stainless steel
Spring: Zinc-plated steel (green spring) or
17-7 stainless steel (red spring)
Top Plug: 17-4 Stainless steel
Bottom Plug: S41600 Stainless steel
Inlet Strainer: S31600 Stainless steel
Strainer Replacement Shim: 18-8 Stainless steel
Diaphragm: Nitrile (NBR) or fluoroelastomer (FKM)
O-Rings: Nitrile (NBR) or fluoroelastomer (FKM)
Flanged Locknut: Zinc-plated steel
Backup Rings: Teflon™ (PTFE)
Upper Spring Seat: S41600 Stainless steel
Stem: S30300 Stainless steel
Indicator Protector and Cover: Plastic
Indicator Fitting: S41600 Stainless steel
Travel Indicator Plug: S41600 Stainless steel
6358 Series Pilots
Body: CF8M Stainless steel
Spring Case: CF8M Stainless steel
Body Plug: S30300 Stainless steel
Valve Plug: Nitrile (NBR) or fluoroelastomer (FKM)
plug with stainless steel stem
Spring: Zinc-plated steel
Diaphragm: Nitrile (NBR) or fluoroelastomer (FKM)
Spring Seat: Zinc-plated steel
Stem Guide: Stainless steel
Adjusting Screw: Zinc-plated steel
O-Rings: Nitrile (NBR) or fluoroelastomer (FKM)
Lower Seat: Thermoplastic
Diaphragm Limiter: Stainless steel
Type 252 Pilot Supply Filter
Body: Aluminum or stainless steel
Filter Cartridge: Polyethylene
Upper and Lower Seats: Delrin(3)Drain Valve or Pipe Plug: S31600 Stainless steel
O-ring: Nitrile (NBR)
Mounting Parts
Pilot Mounting Pipe Nipple: Plated steel
Tubing: Stainless steel
Fittings: Stainless steel

1. The pressure/temperature limits in this bulletin and any applicable standard or code limitation should not be exceeded.
2. Set pressure is defined as the pressure at which the pilot starts to discharge.
3. Trademark of E.I. duPont de Nemours Co.

4

Bulletin 71.4:EZR
Table 1. Main Valve Body Sizes, End Connection Styles, and Structural Design Ratings(1)MAIN VALVE BODY SIZE

MAIN VALVE BODY MATERIALEND CONNECTION STYLES(1)NPT (2-inch only)

400 psig (27,6 bar)2, 3, 4, and 6-inch(DN 50, 80, 100, and 150)

Cast iron

ANSI Class 125B FF

200 psig (13,8 bar)

ANSI Class 250B RF

500 psig (34,5 bar)

NPT or SWE (1 and 2-inch only)

1480 psig (102 bar)

ANSI Class 150 RF

285 psig (19,6 bar)

ANSI Class 300 RF

740 psig (51,0 bar)

ANSI Class 600 RF or BWE

1480 psig (102 bar)

1, 2, 3, 4, and 6-inch(DN 25, 50, 80, 100, and 150)

WCB Steel

STRUCTURAL DESIGN RATING(2)1. Ratings and end connections for other than ANSI standard can usually be provided. Contact your Fisher Sales Representative or Sales Office for assistance.
2. See tables 3, 5, 6, and 7 for diaphragm materials and additional pressure ratings.

Table 2. Set Pressure Ranges, Pilot Pressure Ratings, and Pilot Information(1)PILOT CONTROL INFORMATION

PILOT
TYPE

RELIEF SETPRESSURE RANGE,
PSIG (bar)Part Number

Color

Wire Diameter, Free Length, Maximum Operating Maximum Emergency
Inches (cm)Inches (cm) Pressure, Psig (bar) Pressure, Psig (bar)6358 and
6358B

20 to 40 (1,4 to 2,8)35 to 125 (2,4 to 8,6)

1E392527022
1K748527202

Yellow
Red

0.148 (0,376)
0.187 (0,475)

2.00 (5,08)
2.19 (5,56)

6358EB

75 to 140 (5,2 to 9,7)130 to 200 (9,0 to 13,8)
180 to 350 (12,4 to 24,1)

17B1261X012
17B1263X012
17B1264X012

Green
Blue
Red

0.225 (0,572)
0.262 (0,665)
0.294 (0,747)

3.70 (9,40)
3.85 (9,78)
4.22 (10,7)

6358EBH

250 to 450 (17,3 to 31,0)
400 to 600 (27,6 to 41,4)(2)

17B1263X012
17B1264X012

Blue
Red

0.262 (0,685)
0.294 (0,747)

3.85 (9,78)
4.22 (10,7)150 (10,3)150 (10,3)650 (44,8)750 (51,7)

1. See the Main Valve Body Sizes, End Connections, Structural Design Ratings tables, and the Main Valve Diaphragm and Spring Pressure Ratings table for additional pressure ratings.
2. Fluoroelastomer diaphragms are limited to 450 psig (31,1 bar).

Table 3. Main Valve Minimum Differential Pressures(1)MAIN VALVEBODY SIZE,INCH (DN)
1(25)

2 (50)

3 (80)

4
(100)

6
(150)

MINIMUM DIFFERENTIAL, PERCENT OF CAGE CAPACITY, PSID (bar d)
MAIN SPRING PARTNUMBER AND COLOR

For 90% Capacity

For 100% Capacity

100% Trim

60% Trim

30% Trim

100% Trim

60% Trim

19B2399X012, White (2)19 (1,3)

19 (1,3)

22 (1,5)

19 (1,3)

20 (1,4)

30% Trim
24 (1,7)

19B2400X012, Light Blue28 (1,9)28 (1,9)35 (2,4)

28 (1,9)28 (1,9)41 (2,8)

19B2401X012, Black(3)

40 (2,8)41 (2,8)47 (3,2)40 (2,8)42 (2,9)70 (4,8)

19B0951X012, Yellow(2)13 (0,9)17 (1,2)

24 (1,7)

13 (0,9)17 (1,2)

24 (1,7)

18B2126X012, Green

16 (1,1)

21 (1,5)29 (2,0)20 (1,4)25 (1,7)30 (2,1)

18B5955X012, Red(3)

23 (1,6)28 (1,9)30 (2,1)

30 (2,1)

31 (2,1)

32 (2,2)

T14184T0012, Yellow(2)14 (0,97)

14 (0,97)

17 (1,2)

18 (1,2)

18 (1,2)

19 (1,3)
22 (1,5)

19B0781X012, Light Blue15 (1,0)15 (1,0)18 (1,2)

21 (1,4)

21 (1,4)

19B0782X012, Black(3)26 (1,8)26 (1,8)27 (1,8)33 (2,3)

33 (2,3)

33 (2,3)

T14184T0012, Yellow(2)10 (0,69)

11 (0,76)

12 (0,83)

18 (1,2)

20 (1,4)

20 (1,4)

18B8501X012, Green

14 (0,9)15 (0,9)17 (1,2)

22 (1,5)

24 (1,7)24 (1,7)

18B8502X012, Red(3)

20 (1,4)

24 (1,7)29 (2,0)30 (2,1)

30 (2,1)

30 (2,1)

19B0364X012, Yellow(2)8 (0,6)

9 (0,6)

10 (0,69)

10 (0,69)

10 (0,69)

13 (0,9)19B0366X012, Green

15 (1,0)15 (1,0)16 (1,1)

17 (1,2)

19 (1,3)

20 (1,4)

19B0365X012, Red(3)

16 (1,1)

18 (1,3)

19 (1,3)

20 (1,4)

24 (1,7)24 (1,7)

1. See table 1 for structural design ratings, table 3 for pilot ratings, and table 7 for maximum pressure ratings.
2. The white and yellow springs are only recommended for inlet pressures under 100 psig (6,9 bar).
3. The red and black springs are only recommended for inlet pressures over 500 psig (34,5 bar).

5Bulletin 71.4:EZR
DIAPHRAGM AND PLUG ASSEMBLY

INLET PRESSURE
LOADING PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE

MAIN SPRING

TYPE 6358EB PILOT

W7350

Figure 3. Type EZR Operational Schematic

Principle of Operation
A pressure relief valve is a throttling pressure control
device that opens to ensure the upstream pressure
does not rise above a predetermined pressure. A
backpressure regulator is a device that controls andresponds to changes in the upstream pressure. It
functions the same as a relief valve in that it opens on
increasing upstream pressure.
Fisher Type EZR relief valves cannot be used as
ASME safety relief valves.

the pilot restriction, provide downward loading pressure
to keep the main valve diaphragm and plug assembly
tightly shutoff.
When the inlet pressure rises above the set pressure,the pressure on the pilot diaphragm overcomes thepilot control spring and opens the pilot valve plug. The
pilot then exhausts the loading pressure from the topof the main valve diaphragm and plug assembly. The
inlet pressure unbalance overcomes the main springforce and opens the diaphragm and plug assembly.

Relief Valve

The pilot continuously exhausts gas when the inlet
pressure is above the set pressure.

As long as the inlet pressure is below the set pressure,the pilot control spring keeps the pilot valve plug closed.
Inlet pressure passes through the pilot restriction andregisters as loading pressure on top of the Type EZR
diaphragm and plug assembly. Force from the main
spring, in addition to inlet pressure bleeding throughAs the inlet pressure drops below the set pressure, thepilot control spring closes the pilot valve plug and theexhaust to atmosphere stops. Force from the main
spring, along with pilot loading pressure, pushes thediaphragm and plug assembly onto the knife edgedseat, producing tight shutoff.

6

Bulletin 71.4:EZR
HOLLOW PASSAGE
IN VALVE PLUG STEM

DIAPHRAGMASSEMBLY

UPPER PORTION
OF VALVE PLUGHOLLOW PASSAGE
IN VALVE PLUG STEM

DIAPHRAGMASSEMBLY

UPPER PORTION
OF VALVE PLUGFIXED RESTRICTION

LOWER PORTION
OF VALVE PLUG

TO MAIN VALVE
DIAPHRAGM
TO EXHAUST PORTRESTRICTION PLUG

LOWER PORTION
OF VALVE PLUGLOADING PRESSURE

LOADING PRESSURE

OUTLET PRESSURE

OUTLET PRESSURE

EXPANDED VIEW OF THE TYPE 6358B RELIEF PILOT
DIAPHRAGM ASSEMBLY AND VALVE PLUG

TO MAIN VALVE
DIAPHRAGM
TO EXHAUST PORTEXPANDED VIEW OF THE TYPE 6358 BACKPRESSURE PILOT
DIAPHRAGM ASSEMBLY AND VALVE PLUG

Figure 4. Type 6358B Operational Schematic

Figure 5. Type 6358 Operational Schematic

Backpressure Regulator

Pilot Descriptions

As long as inlet pressure remains below setpoint, thepilot control spring keeps the pilot valve plug closed.
Inlet pressure passes through the upper port around theupper portion of the valve plug and then through thehollow passage in that valve plug. Force from the main
spring, in addition to inlet pressure bleeding throughthe pilot, provides downward loading pressure to keep
the main valve diaphragm and plug assembly tightly
shut off.

The following pilot configurations are available for theType EZR relief valve or backpressure regulator.

When inlet pressure rises above the set pressure,pressure on the pilot diaphragm overcomes the control
spring to close the upper port and stroke the valve
plug to open the lower port. The pilot then exhausts
loading pressure from the top of the main valve
diaphragm and lets inlet pressure unbalance overcome
the main spring force to open the main valve
diaphragm and plug assembly.
While the main valve is throttling, the upper port of thepilot stays closed. The pilot exhausts only when it
repositions the main valve. As inlet pressure drops
below setpoint, the pilot control spring overcomes thediaphragm force to stroke the valve plug down to close
the lower port and open the upper port. Force from themain spring, along with pilot loading pressure, pushes
the diaphragm and plug assembly onto the knife edgedseat, producing tight shutoff.

Relief ValveThe Type EZR relief valve uses the Types 6358B,
6358EB, and 6358EBH relief pilots. The pilot bleeds
constantly while the relief valve is in operation. The pilot
does not bleed when inlet pressure is below set
pressure. The pilot exhaust can be connected directly tothe main valve exhaust pipe if the pilot connection andthe exhaust pipe are designed to prevent significant
backpressure buildup during full-flow conditions.
The pilot restriction code is indicated by a letter
stamped on the bottom of the pilot body: an H for theyellow, small-diameter, high gain restriction (standard);
S for the red, medium diameter, medium gain
restriction; and L for the blue, large-diameter, low gain
restriction. The high gain restriction has the lowest
buildups and fastest speed of response.
Type 6358B—Set pressure range from 20 to 125 psig
(1,4 to 8,6 bar) in two ranges. This pilot is available
with a high, medium, or low gain restriction.
Type 6358EB—Set pressure range of 75 to 350 psig
(5,2 to 24,1 bar) in three ranges. To acheive higher

7

Bulletin 71.4:EZR
pressures and accuracy, this pilot has an extended
spring case to accommodate longer springs. This pilot
is available with a high or low gain restriction.
Type 6358EBH—The high pressure version of theType 6358EB pilot with a set pressure range of 250 to
600 psig (17,2 to 41,4 bar) in two ranges. This pilot isavailable with a high or low gain restriction.

Backpressure Regulator
The Type 6358 is a low bleed pilot, so it only exhausts
while it is repositioning the main valve. There is noconstant bleed with this construction. This minimizes
dirt buildup in the pilot. The Type 6358 has a set
pressure range of 20 to 125 psig (1,4 to 8,6 bar) in two
ranges. The Types 6358B, 6358EB, and 6358EBH
pilots can also be used in backpressure applications.
Pilot exhaust can be piped into the downstream
system on applications requiring no bleed.

Optional Travel Indicator
The travel indicator responds with the precise
movement of the diaphragm and plug assembly toshow actual valve position. A travel indicator can beused for in-line inspection and troubleshooting, remote
stem positioning, and alarming.

Capacity Information
Table 9 shows the natural gas relief capacities of theType EZR relief valve or backpressure regulator atselected inlet pressures and outlet pressure settings.
Flows are in scfh (at 60°F and 14.7 psia) and m3/h(n)(at 0°C and 1,01325 bar) of 0.6 specific gravity
natural gas. To determine equivalent capacities for air,propane, butane, or nitrogen, multiply the capacity by
the following appropriate conversion factor: 0.775 forair, 0.628 for propane, 0.548 for butane, or 0.789 fornitrogen. For gases of other specific gravities, multiply the given capacity by 0.775, and divide by thesquare root of the appropriate specific gravity.
To find approximate relief capacities at set pressuresor buildups not given in table 7 or 9, use one of thefollowing formulas and, if necessary, convert according to the factors in the paragraph above. Then, if
capacity is desired in normal cubic meters per hour at
0°C and 1,01325 bar, multiply scfh by 0.0268.

Critical Pressure Drops
For critical pressure drops (absolute outlet pressure
equal to or less than one-half of absolute inlet pressure), use the following formula:Q = (P1 + Buildup)abs Cg

520
GTOptional Inlet Strainer
The stainless steel inlet strainer is designed with holes
smaller than the cage slots to prevent pipeline debris
from becoming trapped in the main valve body. Once
trapped in the body, the debris can clog the cage slot
affecting shutoff performance. An inlet strainer istypically not used in relief applications because debris
clogging the strainer can restrict the flow.

Optional Pilot Supply Filter
The Type 252 pilot supply filter prevents pipeline debris
from entering the pilot; a primary cause of pilot
clogging. The aluminum body is rated for 2150 psig
(148 bar) and the stainless steel body for 2750 psig
(190 bar). Both are available in standard or extended
length with a pipe plug or a drain valve. When the
upstream system is free of debris, the Type EZR may
be installed without a filter. A pilot supply filter is not
typically used in relief applications because filter
plugging may hamper pilot operation.

8

Non-Critical Pressure Drops
For pressure drops lower than critical (absolute outletpressure greater than one-half of absolute inlet pressure), use the following formula:Q= 3417520
Cg (P1 + Buildup)abs SIN 
GT
 C1

∆P 
 Deg.
P1 

where,
Q = flow capacity in scfh
G = specific gravity of gas
T = absolute temperature of gas at inlet indegrees Rankine
Cg = gas sizing coefficient from table 8
P 1abs = absolute inlet pressure in psia
(P1 gauge + 14.7)
C1 = Cg/Cv from table 8∆P = pressure drop across the valve in psig

Bulletin 71.4:EZR
STYLE(IMPRINT)

MATERIAL(IMPRINT)

Table 4. Diaphragm Imprint Codes
STYLE

MATERIAL

DIAPHRAGM MATERIALS

Imprint Ink Mark Imprint Ink Mark
1 11

1

17E67

17E67 - Nitrile (NBR) (distribution
or low pressure industrial)

2

17E68

17E68 - Nitrile (NBR)(low temperature)

4

17E88

17E88 - Fluoroelastomer (FKM)(high aromatic hydrocarbon
content resistance)

5

17E97

17E97 - Nitrile (NBR) (high-pressure
and/or erosion resistance)

1

1

1

1

1

2

MATERIAL(INK MARK)130

STYLE (INK MARK)(MAY BE IN EITHERLOCATION)

DOME IDENTIFICATION

Figure 6. Diaphragm Markings

Table 5. Diaphragm Temperature Capabilities, Erosion Resistance, and Chemical Compatibility
17E67
NITRILE (NBR)

17E68
NITRILE (NBR)

17E97
NITRILE (NBR)

17E88
FLUOROELASTOMER (FKM)

Gas Temperature(for lower temperaturescontact your local Sales
Office or Representative)

0° to 150°F (-17° to 66°C)-20° to 150°F (-28° to 66°C)

0° to 150°F (-17° to 66°C)

0° to 250°F (-17° to 121°C)(1)

General Applications

Best for low to medium
pressure conditions, suchas distribution service or
low to medium pressure
industrial service.

Best for cold temperatures.

Best for high pressure
conditions, i.e. transmission
service or high pressure
industrial service. It is also
the best for abrasive or
erosive service applications.

Best for natural gas havingaromatic hydrocarbons. It isalso the best for hightemperature applications.

Heavy Particle Erosion

Fair

Fair

Excellent

Good

Excellent

Good

Excellent

Excellent

Fair

Poor

Good

ExcellentNot recommended

Not recommended

Poor

Excellent

Good

Good

Good

Good

Up to 3% ketone

Fair

Fair

Fair

Fair

Up to 10% alcohol

Good

Good

Good

Fair

Up to 3% synthetic lube

Fair

Fair

Fair

Good

Natural Gas With:
Up to 3% aromatichydrocarbon content(2)3 - 15% aromatichydrocarbon content(2)15 - 50% aromatichydrocarbon content(2)Up to 3% H2S (hydrogensulfide or sour gas)

1. For differential pressures above 400 psig (27,6 bar) diaphragm temperature is limited to 150°F (66°C).
2. The aromatic hydrocarbon content is based on percent volume.

9Bulletin 71.4:EZR
Table 6. Main Valve Maximum Pressures, Diaphragm Selection Information, and Main Spring Selection(1)BODY SIZE,INCHES(DN)

DIAPHRAGM
MATERIAL
17E68 Nitrile (NBR)
Low temperature

1 (25)

17E97 Nitrile (NBR)
High-pressure and/or
erosion resistance
17E88 Fluoroelastomer (FKM)High aromatic hydrocarbon
content resistance
17E67 Nitrile (NBR)
Distribution andlow pressure industrial
17E68 Nitrile (NBR)
Low temperature

2 (50)

17E97 Nitrile (NBR)
High-pressure and/or
erosion resistance
17E88 Fluoroelastomer (FKM)High aromatic hydrocarbon
content resistance
17E67 Nitrile (NBR)
Distribution andlow pressure industrial
17E68 Nitrile (NBR)
Low temperature

3 (80)

17E97 Nitrile (NBR)
High-pressure and/or
erosion resistance
17E88 Fluoroelastomer (FKM)High aromatic hydrocarbon
content resistance
17E67 Nitrile (NBR)
Distribution andlow pressure industrial
17E68 Nitrile (NBR)
Low temperature

4 (100)

17E97 Nitrile (NBR)
High-pressure and/or
erosion resistance
17E88 Fluoroelastomer (FKM)High aromatic hydrocarbon
content resistance
17E68 Nitrile (NBR)
Low temperature

6 (150)

17E97 Nitrile (NBR)
High-pressure and/or
erosion resistance
17E88 Fluoroelastomer (FKM)High aromatic hydrocarbon
content resistance

MAXIMUM
MAXIMUM OPERATINGOPERATING INLET
DIFFERENTIALPRESSURE
PRESSURE

MAXIMUM
EMERGENCY INLETAND DIFFER-ENTIALPRESSURE

100 psig (6,9 bar)

100 psid (6,9 bar d)

100 psid (6,9 bar d)

White

460 psig (31,7 bar)

400 psid (27,5 bar d)

460 psid (31,7 bar d)Light Blue

500 psig (34,5 bar)

500 psid (34,5 bar d)

1050 psid (72,4 bar d)Light Blue

1050 psig (72,4 bar)

800 psig (55,2 bar d)

1050 psid (72,4 bar d)Black(2)500 psig (34,5 bar)

500 psid (34,5 bar d)(3)750 psid (51,7 bar d)Light Blue

750 psig (51,7 bar)

500 psid (34,5 bar d)(3)750 psid (51,7 bar d)Black(2)100 psig (6,9 bar)

100 psid (6,9 bar d)

100 psid (6,9 bar d)

Yellow

500 psig (34,5 bar)

500 psid (34,5 bar d)

750 psid (51,7 bar d)Green

100 psig (6,9 bar)

100 psid (6,9 bar d)

100 psid (6,9 bar d)

Yellow

460 psig (31,7 bar)

400 psid (27,5 bar d)

460 psid (31,7 bar d)

Green

500 psig (34,5 bar)

500 psid (34,5 bar d)

1050 psid (72,4 bar d)

Green1050 psig (72,4 bar)

800 psid (55,2 bar d)

1050 psid (72,4 bar d)

Red(2)

500 psig (34,5 bar)

500 psid (34,5 bar d)(3)750 psid (51,7 bar d)

Green

750 psig (51,7 bar)

500 psid (34,5 bar d)(3)750 psid (51,7 bar d)

Red(2)

100 psig (6,9 bar)

100 psid (6,9 bar d)

100 psid (6,9 bar d)

Yellow

360 psig (24,8 bar)

300 psid (20,7 bar d)

750 psid (51,7 bar d)Light Blue

100 psig (6,9 bar)

100 psid (6,9 bar d)

100 psid (6,9 bar d)

Yellow

DIAPHRAGM
STYLE

130

130

360 psig (24,8 bar)

300 psid (20,7 bar d)

500 psid (34,5 bar d)Light Blue

500 psig (34,5 bar)

500 psid (34,5 bar d)

1050 psid (72,4 bar d)Light Blue

1050 psig (72,4 bar)

800 psid (55,2 bar d)

1050 psid (72,4 bar d)Black(2)500 psig (34,5 bar)

500 psid (34,5 bar d)(3)750 psid (51,7 bar d)Light Blue

750 psig (51,7 bar)

500 psid (34,5 bar d)(3)750 psid (51,7 bar d)Black(2)130

100 psig (6,9 bar)

100 psid (6,9 bar d)

100 psid (6,9 bar d)

Yellow

360 psig (24,8 bar)

300 psid (20,7 bar d)

750 psid (51,7 bar d)Green

100 psig (6,9 bar)

100 psid (6,9 bar d)

100 psid (6,9 bar d)

Yellow

360 psig (24,8 bar)

300 psid (20,7 bar d)

500 psid (34,5 bar d)

Green

500 psig (34,5 bar)

500 psid (34,5 bar d)

1050 psid (72,4 bar d)

Green1050 psig (72,4 bar)

800 psid (55,2 bar d)

1050 psid (72,4 bar d)

Red(2)

500 psig (34,5 bar)

500 psid (34,5 bar d)(3)750 psid (51,7 bar d)

Green

750 psig (51,7 bar)

500 psid (34,5 bar d)(3)750 psid (51,7 bar d)

Red(2)

130

100 psig (6,9 bar)

100 psid (6,9 bar d)

100 psid (6,9 bar d)

Yellow

360 psig (24,8 bar)

300 psid (20,7 bar d)

500 psid (34,5 bar d)

Green

500 psig (34,5 bar)

500 psid (34,5 bar d)

1050 psid (72,4 bar d)

Green1050 psig (72,4 bar)

800 psid (55,2 bar d)

1050 psid (72,4 bar d)

Red(2)

500 psig (34,5 bar)

500 psid (34,5 bar d)(3)750 psid (51,7 bar d)

Green

750 psig (51,7 bar)

500 psid (34,5 bar d)(3)750 psid (51,7 bar d)

Red(2)

1. See table 1 for main valve structural design ratings and table 3 for pilot ratings.
2. The red and black springs are recommended for applications where the maximum inlet pressures can exceed 500 psig (34,5 bar).
3. For differential pressures above 400 psid (27,6 bar d) diaphragm temperatures are limited to 150°F (66°C).

10

MAIN
SPRING
COLOR

130

Bulletin 71.4:EZR
Table 7. Pilot Information

PILOT
TYPE

6358

6358B

6358EB

6358EBH

BUILDUP OVER SET BUILDUP OVER SET PRESSURE DROPBELOW SETPRESSURE NEEDED PRESSURE NEEDEDTO FULLY OPEN
PRESSURE NEEDEDTO BEGIN OPENING
(
2
)
(
3
)
MAIN VALVE ,TO RESEAT PILOT,
MAIN VALVE ,PSIG (bar)PSIG (bar)PSIG (bar)SET PRESSURE
RANGE, SPRINGPART NUMBER,
AND COLOR,
PSIG (bar)MAIN VALVESPRING COLOR

SET PRESSURE(1),20 to 40
(1,4 to 2,8)
1E392527022
Yellow

Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue20 (1,4)25 (1,7)30 (2,1)
40 (2,8)

1.0 (0,069)
1.0 (0,069)
1.0 (0,069)
1.0 (0,069)

2.0 (0,14)
2.0 (0,14)
2.0 (0,14)
2.0 (0,14)

5.0 (0,34)
5.0 (0,34)
5.0 (0,34)
5.0 (0,34)

35 to 125
(2,4 to 8,6)
1K748527202
Red

Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue40 (2,8)60 (4,1)
80 (5,5)100 (6,9)125 (8,6)

1.4 (0,10)
1.4 (0,10)
1.5 (0,10)
1.6 (0,11)
1.6 (0,11)

2.5 (0,17)
2.5 (0,17)
2.8 (0,19)
3.0 (0,21)
3.0 (0,21)

5.0 (0,34)
5.0 (0,34)
5.0 (0,34)
5.0 (0,34)
5.0 (0,34)

20 to 40
(1,4 to 2,8)
1E392527022
Yellow

Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue20 (1,4)25 (1,7)30 (2,1)
40 (2,8)

1.0 (0,069)
1.0 (0,069)
1.0 (0,069)
1.0 (0,069)

2.0 (0,14)
2.0 (0,14)
2.0 (0,14)
2.0 (0,14)

1.0 (0,069)
1.0 (0,069)
1.0 (0,069)
1.0 (0,069)

35 to 125
(2,4 to 8,6)
1K748527202
Red

Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue40 (2,8)60 (4,1)
80 (5,5)100 (6,9)125 (8,6)

1.4 (0,10)
1.4 (0,10)
1.5 (0,10)
1.6 (0,11)
1.6 (0,11)

2.5 (0,17)
2.5 (0,17)
2.8 (0,19)
3.0 (0,21)
3.0 (0,21)

1.0 (0,069)
1.0 (0,069)
1.0 (0,069)
1.0 (0,069)
1.0 (0,069)

75 to 140
(5,2 to 9,7)
17B1261X012
GreenGreen or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue75 (5,2)
100 (6,9)125 (8,6)140 (9,7)

1.7 (0,12)
1.7 (0,12)
2.1 (0,14)
2.4 (0,17)

3.0 (0,21)
3.0 (0,21)
3.5 (0,24)
4.0 (0,28)

2.0 (0,14)
2.0 (0,14)
2.0 (0,14)
2.0 (0,14)130 to 200(9,0 to 13,8)
17B1263X012
Blue

Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue140 (9,7)150 (10,3)
175 (12,1)200 (13,8)

3.0 (0,21)
3.5 (0,24)
4.5 (0,31)
5.0 (0,34)

5.0 (0,34)
5.5 (0,38)
6.5 (0,45)
7.5 (0,52)

3.0 (0,21)
3.0 (0,21)
3.0 (0,21)
3.0 (0,21)

180 to 350(12,4 to 24,2)
17B1264X012
Red

Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue200 (13,8)225 (15,5)250 (17,2)
275 (19,0)300 (20,7)
325 (22,4)350 (24,1)

5.0 (0,34)
5.0 (0,34)
5.0 (0,34)
5.5 (0,38)
5.5 (0,38)
5.5 (0,38)
5.5 (0,38)

8.0 (0,55)
8.0 (0,55)
8.5 (0,59)
8.5 (0,59)
8.5 (0,59)
9.0 (0,62)
9.0 (0,62)

3.0 (0,21)
3.0 (0,21)
3.0 (0,21)
3.0 (0,21)
3.0 (0,21)
3.0 (0,21)
3.0 (0,21)250 to 450(4)(17,2 to 31,0)(4)
17B1263X012
Blue

Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue
Green or Lt. Blue350 (24,1)
375 (25,9)400 (27,6)425 (29,3)
450 (31,0)

6.0 (0,41)
6.0 (0,41)
6.5 (0,45)
7.0 (0,48)
7.5 (0,52)

9.5 (0,66)
9.5 (0,66)
10.0 (0,69)
10.5 (0,72)
11.0 (0,76)

6.0 (0,41)
6.0 (0,41)
6.0 (0,41)
6.0 (0,41)
6.0 (0,41)

400 to 600(4)(27,6 to 41,4)(4)
17B1264X012
Red

Green or Lt. Blue
Red or BlackRed or BlackRed or Black450 (31,0)500 (34,5)550 (37,9)600 (41,4)

7.5 (0,52)
8.0 (0,55)
8.5 (0,59)
9.0 (0,62)

11.5 (0,79)
12.0 (0,83)
13.0 (0,90)
14.0 (0,97)

6.0 (0,41)
6.0 (0,41)
6.0 (0,41)
6.0 (0,41)

PSIG (bar)

1. Set pressure is defined as the pressure at which the pilot starts to discharge.
2. Crack point pressure of the main valve or the inlet pressure buildup over the set pressure at which the main valve starts audible flow.
3. Inlet pressure buildup over the set pressure for the main valve to achieve wide-open flow capacity.
4. The maximum operating pressure for fluoroelastomer pilot diaphragms is limited to 450 psig (31,0 bar).

11Bulletin 71.4:EZR
Table 8. Main Valve Flow Coefficients(1)MAIN
CAGE STYLE,VALVEPERCENT OF
BODY SIZE,CAPACITY
INCH (DN)
1-inch(25)
2-inch(50)
3-inch(80)
4-inch(100)
6-inch
(150)

100%
60%
30%
100%
60%
30%
100%
60%
30%
100%
60%
30%
100%
60%
30%

LINE SIZE EQUALS BODY SIZE PIPING

2:1 LINE SIZE TO BODY SIZE PIPING

With Inlet Strainer

Without Inlet Strainer

With Inlet Strainer

Cg

Cv

C1

Cg

Cv

C1

Cg

Cv

C1

Without Inlet Strainer
Cg

Cv

C1

494
290
145
1890
1040
570
3550
2000
980
5690
3360
1710
11,600
7,120
3,560

14.8
10.1
5.0
50.8
35.6
21.4
91.4
70.3
38.0
147
124
66.5
325
239
135

33.4
28.7
28.8
37.2
29.2
26.6
38.8
28.5
25.8
38.7
27.1
25.7
35.7
29.8
26.4

494
282
141
1970
1050
570
3720
2000
980
5830
3360
1710
12,000
7,200
3,560

15.3
9.8
4.9
54.6
36.3
21.4
99.9
70.3
38.0
154
124
66.5
337
241
134

32.4
28.9
28.7
36.1
28.9
26.6
37.2
28.5
25.8
37.9
27.1
25.7
35.6
29.9
26.6

481
286
144
1800
1020
560
3390
1970
970
5540
3300
1690
11,200
7,150
3,570

14.4
9.9
5.0
50.4
35.9
21.5
90.6
67.5
36.9
145
122
66.3
314
240
135

33.4
29.0
28.6
35.7
28.4
26.0
37.4
29.2
26.3
38.2
27.0
25.5
35.7
29.8
26.4

478
275
139
1840
1020
560
3510
1970
970
5640
3300
1690
11,700
7,230
3,590

14.6
9.5
4.9
53.0
35.9
21.5
97.1
68.3
36.9
151
121
66.8
329
242
135

32.7
28.9
28.5
34.7
28.4
26.0
36.1
28.8
26.3
37.4
27.3
25.3
35.6
29.9
26.6

1. Km for the 1-inch (DN 25) body size at 100% capacity is 0.88, the 2-inch (DN 50) is 0.92, the 3-inch (DN 80) is 0.94, the 4-inch (DN 100) is 0.84, and the 6-inch (DN 150) is 0.82.

Table 9. Capacities
SET PRESSURE
SETRANGE, SPRING PARTPRESSURE(1),NUMBER, AND COLOR,
PSIG (bar)PSIG (bar)

CAPACITIES IN THOUSANDS OF SCFH (m3/h(n)) OF 0.6 SPECIFIC GRAVITY NATURAL GASWITH 2:1 LINE SIZE TO BODY SIZE PIPING AND WITHOUT INLET STRAINER
1-inch (DN 25)

2-inch (DN 50)

3-inch (DN 80)

4-inch (DN 100)6-inch (DN 150)

20 to 40
(1,4 to 2,8)
1E392527022, Yellow

20 (1,4)25 (1,7)30 (2,1)
40 (2,8)24 (0,6)27 (0,7)31 (0,8)38 (1,0)87 (2,33)
99 (2,65)
111 (2,98)
135 (3,62)

166 (4,45)
189 (5,07)
211 (5,66)
257 (6,89)

267 (7,16)
303 (8,12)340 (9,11)413 (11,1)

496 (13,3)
576 (15,4)563 (15,0)806 (21,6)

35 to 125
(2,4 to 8,6)
1K748527202, Red

40 (2,8)60 (4,1)
80 (5,5)100 (6,9)125 (8,6)38 (1,0)52 (1,4)
67 (1,8)81 (2,2)
99 (2,7)140 (3,75)
183 (4,92)
231 (6,21)279 (7,50)
339 (9,09)267 (7,16)350 (9,38)
441 (11,8)533 (14,3)646 (17,3)

429 (11,5)562 (15,1)
709 (19,0)856 (22,9)1038 (27,8)806 (21,6)1102 (29,5)1392 (37,3)
1677 (44,9)2029 (54,4)

75 to 140
(5,2 to 9,7)
17B1261X012, Green75 (5,2)
100 (6,9)125 (8,6)140 (9,7)63 (1,7)
81 (2,2)
99 (2,7)110 (2,9)220 (5,91)
279 (7,50)
340 (9,12)377 (10,1)420 (10,3)533 (14,3)
648 (17,4)
719 (19,3)

674 (18,0)856 (22,9)1042 (27,9)1155 (31,0)1320 (34,4)
1677 (44,9)2029 (54,4)
2237 (60,0)

130 to 200(9,0 to 13,8)
17B1263X012, Blue140 (9,7)150 (10,3)
175 (12,1)200 (13,8)110 (2,9)117 (3,1)
136 (3,6)
154 (4,1)

379 (10,2)404 (10,8)466 (12,5)527 (14,2)

723 (19,4)
771 (20,7)888 (23,8)1006 (27,0)1162 (31,1)
1238 (33,2)
1427 (38,2)
1617 (43,3)

2237 (60,0)2375 (63,6)2716 (72,8)3052 (81,8)

180 to 350(12,4 to 24,2)
17B1264X012, Red

200 (13,8)225 (15,5)250 (17,2)
275 (19,0)300 (20,7)
325 (22,4)350 (24,1)

154 (4,1)
173 (4,6)
193 (5,2)
212 (5,7)232 (6,2)
252 (6,8)272 (7,3)

529 (14,2)
588 (15,8)648 (17,4)
708 (19,0)
767 (20,6)
828 (22,2)
887 (23,8)

1008 (27,0)1122 (30,0)1237 (33,2)1350 (36,2)
1463 (39,2)
1579 (42,3)
1692 (45,3)

1620 (43,4)
1802 (48,3)
1988 (53,3)2170 (58,2)2351 (63,0)2537 (68,0)2719 (72,9)3052 (81 8)3382 (90 6)3708 (99 4)4029 (108)4345 (116)4656 (125)4962 (133)

250 to 450(17,2 to 31,0)(2)
17B1263X012, Blue350 (24,1)
375 (25,9)400 (27,6)425 (29,3)
450 (31,0)272 (7,3)
292 (7,8)313 (8,4)334 (8,9)355 (9,5)888 (23,8)948 (25,4)
1008 (27,1)
1069 (28,7)1129 (30,3)

1694 (45,5)
1808 (48,5)
1923 (51,5)2038 (54,6)2154 (57,7)2732 (73,0)2904 (77,8)3090 (82,8)3275 (87,8)3461 (92,8)4962 (133)5263 (141)5559 (149)5850 (157)6137 (165)

400 to 600(27,6 to 41,4)(2)
17B1264X012, Red

450 (31,0)500 (34,5)550 (37,9)600 (41,4)355 (9,5)398 (10,7)442 (11,8)487 (13,0)1130 (30,3)1250 (33,6)
1371 (36,8)1492 (40,1)2156 (57,8)2385 (63,7)2616 (70,1)
2847 (76,3)

3465 (92,9)3832 (103)4203 (113)4574 (123)6137 (165)
6695 (179)7233 (194)7752 (208)

1. Set pressure is defined as the pressure at which the pilot star ts to discharge.
2. The maximum operating pressure for fluoroelastomer pilot diaphragms is limited to 450 psig (31,0 bar).

12Bulletin 71.4:EZR
E
1/4-INCH NPT PILOT
EXHAUST
CONNECTION WITHREMOVABLE VENTC (INDICATOR
COVER REMOVALCLEARANCE)
R (TRIMREMOVAL
CLEARANCE)G

1/4-INCH NPTUPSTREAMCONTROL LINE
CONNECTION

D
1/4-INCH NPTPILOT EXHAUSTCONNECTION
WITH REMOVABLE
VENT
A/2

A
B2018_1

A

BODY SIZE,INCHES (DN) SWE or NPT

125B FFor 150 RF

250B or
300 RF

600 RFor BWE

C

D
(MAX)

E

G

R

8.65 (220)9.87 (251)

1 (25)

8.25 (210)7.25 (184)7.75 (197)

8.25 (210)2.00 (51)2.38 (60)

7.44 (176)

2 (50)

11.25 (286)

10.00 (254)

10.50 (267)

11.25 (286)2.00 (51)3.06 (78)7.44 (176)

9 (229)11 (279)

3 (80)---

11.75 (298)12.5 (317)13.25 (337)

3.75 (95)

3.81 (97)8.19 (208)13.3 (338)

5.9 (150)

4 (100)---13.9 (353)

14.5 (368)15.5 (394)3.75 (95)

5.06 (129)8.45 (215)14.7 (373)

20.7 (526)

6 (150)---17.8 (451)18.6 (473)20.0 (508)

3.8 (95)

5.5 (140)

10.88 (276)15.2 (386)32.8 (579)

Figure 7. Dimensions

Table 10. Approximate Weights
BODY SIZE,INCHES (DN)WCB STEEL MAIN VALVE BODY,
POUNDS (KG)

CAST IRON MAIN VALVE BODY, POUNDS (KG)
NPT

125B FF

250B RF

NPT, SWE,
or BWE

150 RF

300 RF

600 RF

1 (25)

23 (10)22 (10)29 (13)23 (10)22 (10)28 (13)32 (15)2 (50)

52 (24)50 (23)59 (27)51 (23)54 (25)58 (26)65 (30)123 (56)

3 (80)---

89 (40)106 (48)103 (47)

107 (49)

110 (50)

4 (100)---140 (63)

155 (70)

139 (63)145 (66)

159 (72)

192 (87)

6 (150)---205 (94)225 (103)

200 (91)

210 (96)235 (107)350 (160)

1. Add an additional 15 pounds (6,8 kg) to get the weight with a 161AY Series pilot.

13

Bulletin 71.4:EZR
Installation

If system operation is necessary during maintenance,
install block and vent valves as needed.

Not all codes or regulations permit a Type EZR relief
valve to be used as a final overpressure protection
device. Make sure the installation will comply with allapplicable codes and regulations.

Ordering Information

A Type EZR relief valve or backpressure regulator
may be installed in any orientation as long as flow
through the body matches the flow arrow on the main
valve. An upstream control line must be installed in
the 1/4-inch NPT port on the pilot body.

Refer to the Specifications on page 4. Carefully review
each specification then complete the Ordering Guide on
pages 14 and 15 and send it to your Fisher Sales
Representative or Sales Office. If not otherwise specified, the pilot is factory set in the middle of the set
pressure range.

NONRESTRICTIVE
VENTS AND PIPING

ALTERNATE PILOT
EXHAUST PIPING
TYPE EZR
MAIN VALVEPILOTCONTROL LINE
ALTERNATE
CONTROL LINEBLOCK VALVEHAND VALVE

MAIN PRESSURE LINE

RELIEF PRESSURE CONTROLBLOCK VALVETYPE EZR
MAIN VALVECONTROL LINE
PILOT

B2615

ALTERNATE PILOT
EXHAUST PIPINGBACKPRESSURE CONTROL

Figure 8. Optional Installation Schematics

14

BLOCK VALVE

Bulletin 71.4:EZR
Ordering Guide
Main Valve Body Size (Select) 1-Inch (DN 25) (Available in steel only***
 2-Inch (DN 50)*** 3-Inch (DN 80)*** 4-Inch (DN 100)*** 6-Inch (DN 150)***Main Valve Diaphragm Material (Select One)
 17E67 Nitrile (NBR)(standard)*** 17E68 Nitrile (NBR)(low temperature)*** 17E89 Nitrile (NBR)(high-pressure/erosion resistance)*** 17E88 Fluoroelastomer (FKM)(high aromatic hydrocarbons)***Main Valve O-Ring Material (Select One)
 Nitrile (NBR) (standard)*** Fluoroelastomer (FKM)***

Main Valve Body Material and End Connection
Style (Select One)

Inlet Strainer (Select One)

Cast Iron Body
 NPT (2-inch body size only)*** 125B FF*** 250B RF***

Inlet Body Tap (Select One)WCB Steel Body
 NPT (1 or 2-inch body size only)*** 150 RF*** 300 RF*** 600 RF*** SWE (1 or 2-inch body size only)* BWE 40**
 BWE 80*
 PN 16/25/40* specify

Main Valve Main Spring (Select One)
1-inch (DN 25) Main Valve White, for inlet pressures under 100 psig (6,9 bar)*** Light Blue, for inlet pressures up to 500 psig (34,5 bar)*** Black, for inlet pressures over 500 psig (34,5 bar)***2-inch (DN 50) Main Valve Yellow, for inlet pressures under 100 psig (6,9 bar)***
 Green, for inlet pressures up to 500 psig (34,5 bar)*** Red, for inlet pressures over 500 psig (34,5 bar)*** No (standard)*** Yes***

 No body tap* (standard)*** Inlet body tap only*** Inlet body tap with prepiped pilot supply*** Inlet and outlet body taps only*** Inlet and outlet body taps with prepiped pilot supply andpilot bleed***Travel Indicator (Select One)
 No (standard)*** Yes***

Pilot Diaphragm and Valve Plug Material (Select One)
 Nitrile (NBR)(standard)*** Fluoroelastomer (FKM)**

Pilot O-Ring Material (Select One)
 Nitrile (NBR) (standard)*** Fluoroelastomer (FKM)***

Pilot Mounting (Select One)
 Standard*** Quick Disconnect Union**

3-inch (DN 80) Main Valve Yellow, for inlet pressures under 100 psig (6,9 bar)*** Light Blue, for inlet pressures up to 500 psig (34,5 bar)*** Black, for inlet pressures over 500 psig (34,5 bar)***4-inch (DN 100) Main Valve Yellow, for inlet pressures under 100 psig (6,9 bar)***
 Green, for inlet pressures up to 500 psig (34,5 bar)*** Red, for inlet pressures over 500 psig (34,5 bar)***6-inch (DN 150) Main Valve Yellow, for inlet pressures under 100 psig (6,9 bar)***
 Green, for inlet pressures up to 500 psig (34,5 bar)*** Red, for inlet pressures over 500 psig (34,5 bar)***Fisher Regulators Quick Order Guide***

Standard - Readily Available for Shipment**

Non-Standard - Allow Additional Time for Shipment*

Special Order, Constructed from Non-Stocked Parts.
Consult Your Fisher Sales Representative for Availability.

Specification Worksheet
Application:
Specific UseLine Size
Gas Type and Specific Gravity
Gas Temperature
Upstream Regulator Specifications:
Brand of upstream regulator?
Orifice size of the upstream regulator?
Wide-open coefficient of the upstream regulator?
Maximum Inlet Pressure (P1max)
Downstream Pressure Setting(s) (P2)
Maximum Flow (Qmax)
Relief Valve Specifications:
Relief Valve Setpoint
Accuracy Requirements?
Need for Extremely Fast Response?
Other Requirements:

Availability of the product being ordered is determined by the component with the longest
shipping time for the requested construction.

15

Bulletin 71.4:EZR
Pilot Type and Outlet Pressure Range (Select One)6358
 20 to 40 psig (1,4 to 2,8 bar)*** 35 to 125 psig (2,4 to 8,6 bar)***6358B
 20 to 40 psig (1,4 to 2,8 bar)*** 35 to 125 psig (2,4 to 8,6 bar)***6358EB 75 to 140 psig (5,2 to 9,7 bar)*** 130 to 200 psig (9,0 to 13,8 bar)*** 180 to 350 psig (12,4 to 24,1 bar)***6358EBH
 250 to 450 psig (17,2 to 31,0 bar)*** 400 to 600 psig (27,6 to 41,4 bar)***Type 252 Pilot Supply Filter (Optional)
Material
 Stainless steel*** Aluminum**
Length Standard*** Extended**
Drain Valve Yes***
 No**

Trim Package (Optional) Yes, send one Type EZR trim package. (If ordering replacement trim package for change-out of existing Fisher E-body to a
Type EZR, be sure to mark selection of the following items on
this page: body size, diaphragm material, inlet srainer option, andtravel indicator option. If other components are required, they
may be selected on this page.)

Main Valve Replacement Parts Kit (Optional) Yes, send one diaphragm cartridge and O-rings parts kit tomatch this order.
 Yes, send one diaphragm and O-rings parts kit to match
this order.

Pilot Replacement Parts Kit (Optional) Yes, send one replacement parts kit to match this order.

©Fisher Controls International, Inc., 1999, 2001; All Rights Reserved
Fisher and Fisher Regulators are marks owned by Fisher Controls International, Inc. The Emerson logo is a trade mark and service mark of Emerson Electric Co.
All other marks are the property of their respective owners.

The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express
or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.

For information, contact Fisher Controls:
Marshalltown, Iowa 50158 USA
28320 Gallardon, France
Sao Paulo 05424 Brazil
Singapore 128461
Printed in U.S.A.

www.FISHERregulators.com

Regulators