Type EZR Relief

Instruction ManualForm 5476
03/01

Type EZR Relief Valve or Backpressure Regulator

W7347

Figure 1. Type EZR Relief Valve or Backpressure Regulator

Introduction
Scope of ManualThis instruction manual provides installation, startup,
shutdown, and maintenance procedures, and parts
ordering information for the Type EZR relief valve orbackpressure regulator with a 6358 Series pilot. Any
accessories used with this relief valve or backpressure
regulator are covered in their respective manuals.

as a backpressure regulator. The diaphragm and plugassembly moves in response to the pilot loadingpressure to control upstream system pressure. Forcefrom the main spring provides downward pressure tokeep the main valve tightly shut off.

Specifications

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

Specifications for the Type EZR relief valve or backpressure regulator are listed on page 2. The set
pressure range for a pilot as it comes from the factory
appears on the spring case. Other information for anindividual main valve appears on the nameplate.

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

Regulators

www.FISHERregulators.com

D102629X012

Product Description

Type EZR Relief
Specifications
Main Valve Body Sizes, End Connection Styles, andBody Ratings(1)See table 1

Main Valve Flow Direction
Up through the center of the cage down throughcage slots

Maximum Relief (Inlet) Pressure(1)See tables 3 and 6

Noise Information
See the Noise Information section

Minimum Relief Set Pressure(1)20 psig (1,4 bar)Pressure Registration
External through upstream control line

Set Pressure Ranges
See table 3

Upstream Control Line Connection
1/4-inch NPT screwed in pilot body

Diaphragm Selection
See tables 4, 5, and 6

Pilot Spring Case Vent Connection
1/4-inch NPT screwed tapping

Reseat Pressures
See table 7

Material Temperature Capabilities(1)See table 4

1. The pressure/temperature limits in this manual and any applicable standard or code limitation should not be exceeded.

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

Relief ValveAs 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 and registers as loading pressure on top of
the main valve diaphragm and plug assembly. Forcefrom the main spring, in addition to pilot loadingpressure, provide downward loading pressure to keep
the main valve diaphragm and plug assembly tightly
shut off.
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
pilot continuously exhausts gas when the inlet pressure is above the set pressure. The inlet pressure
unbalance overcomes the main spring force and opens
the diaphragm and plug assembly.

2

As 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.

Backpressure Regulator
As long as inlet pressure remains below setpoint, thepilot control spring keeps the pilot valve plug closed.
Inlet pressure passes through the upper port aroundthe upper portion of the valve plug and then throughthe hollow passage in that valve plug. Force from themain spring, in addition to pilot loading pressure,provide downward loading pressure to keep the main
valve diaphragm and plug assembly tightly shut off.
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 exhausts loadingpressure from the top of the main valve diaphragm.
Inlet pressure unbalance overcomes the main springforce to open the 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 theType EZR Relief
DIAPHRAM AND PLUG ASSEMBLY

MAIN SPRING

TYPE 6358EB PILOTINLET PRESSURE
LOADING PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE

W7350

Figure 2. Type EZR Relief Valve or Backpressure Regulator Operational Schematic

main spring, along with pilot loading pressure, pushes
the diaphragm and plug assembly onto the knife edgedseat, producing tight shutoff.

restriction; and L for the blue, large-diameter, low gain
restriction. The high gain restriction has the lowest
buildups and fastest speed of response.

Pilot Descriptions

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.

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

Type 6358EB—Set pressure range of 75 to 350 psig
(5,2 to 24,1 bar) in three ranges. This pilot is available
with a high or low gain restriction.

Relief Valve

Type 6358EBH—Set pressure range of 250 to 600 psig
(17,2 to 41,4 bar) in two ranges. This pilot is available
with a high or low gain restriction.

The 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

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 be usedin backpressure applications. Pilot exhaust can be piped
into the downstream system when no bleed is required.

3

Type EZR Relief
Optional Travel Indicator

typically not used on relief valves because debris canclog the strainer, restricting the flow through the body.

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.

Optional Pilot Supply Filter

Optional 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. Inlet strainers are

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. Pilot supply filters are nottypically used on relief valves because debris can plugthe filter, hampering pilot operation.

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)

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

WCB Steel

STRUCTURAL DESIGN RATING(2)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. 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. 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
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)

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)

30% Trim

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).

4

For 100% Capacity

Type EZR Relief
Table 3. 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 4. Diaphragm Material Selection and Pressure Ratings
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

Up to 3% aromatichydrocarbon content(2)Excellent

Good

Excellent

Excellent

3 - 15% aromatichydrocarbon content(2)

Fair

Poor

Good

Excellent

15 - 50% aromatichydrocarbon content(2)Not recommended

Not recommended

Poor

Excellent

Up to 3% H2S (hydrogensulfide or sour gas)

Good

Good

Good

Good

Natural Gas With:

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

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.

STYLE(IMPRINT)
MATERIAL(IMPRINT)STYLE (INK MARK)(MAY BE IN EITHERLOCATION)

Table 5. Diaphragm Imprint Codes

Imprint Ink Mark Imprint Ink Mark

2

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)

130

1

DIAPHRAGM MATERIALS

1

11
1

MATERIAL

1

STYLE

1

1

MATERIAL(INK MARK)DOMEIDENTIFICATIONSTYLE (INK MARK)(MAY BE IN EITHERLOCATION)

Figure 3. Diaphragm Markings

5Type EZR Relief
Table 6. Main Valve Maximum Pressure Ratings, 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).

6MAIN
SPRING
COLOR

130

Type EZR Relief
Table 7. Pilot Information
PILOT
TYPE

SET PRESSURE
RANGE, SPRINGPART NUMBER, AND
COLOR, PSIG (bar)
20 to 40
(1,4 to 2,8)
1E392527022
Yellow

6358

35 to 125
(2,4 to 8,6)
1K748527202
Red
20 to 40
(1,4 to 2,8)
1E392527022
Yellow

6358B

6358EB

35 to 125
(2,4 to 8,6)
1K748527202
Red
75 to 140
(5,2 to 9,7)
17B1261X012
Green
130 to 200(9,0 to 13,8)
17B1263X012
Blue
180 to 350(12,4 to 24,2)
17B1264X012
Red

6358EBH

250 to 450(4)(17,3 to 31,0)(4)
17B1263X012
Blue
400 to 600(4)(27,6 to 41,4)(4)
17B1264X012
Red

SET PRESSURE(1),PSIG (bar)
20
25
30
40
40
60
80
100
125
20
25
30
40
40
60
80
100
125
75
100
125
140
140
150
175
200
200
225
250
275
300
325
350
350
375
400
425
450
450
500
550
600

(1,4)
(1,7)
(2,1)
(2,8)
(2,8)
(4,1)
(5,5)
(6,9)
(8,6)
(1,4)
(1,7)
(2,1)
(2,8)
(2,8)
(4,1)
(5,5)
(6,9)
(8,6)
(5,2)
(6,9)
(8,6)
(9,7)
(9,7)
(10,3)(12,1)(13,8)(13,8)(15,5)(17,2)(19,0)(20,7)(22,4)(24,1)(24,1)(25,9)(27,6)(29,3)(31,0)(31,0)(34,5)(37,9)(41,4)

BUILDUP OVER SET
PRESSURE NEEDED TO
BEGIN OPENING MAIN
VALVE(2), PSIG (bar)

BUILDUP OVER SET
PRESSURE NEEDED TO
FULLY OPEN MAIN
VALVE(3), PSIG (bar)1.0 (0,069)
1.0 (0,069)
1.0 (0,069)
1.0 (0,069)
1.4 (0,10)
1.4 (0,10)
1.5 (0,10)
1.6 (0,11)
1.6 (0,11)
1.0 (0,069)
1.0 (0,069)
1.0 (0,069)
1.0 (0,069)
1.4 (0,10)
1.4 (0,10)
1.5 (0,10)
1.6 (0,11)
1.6 (0,11)
1.7 (0,12)
1.7 (0,12)
2.1 (0,14)
2.4 (0,17)
3.0 (0,21)
3.5 (0,24)
4.5 (0,31)
5.0 (0,34)
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)
6.0 (0,41)
6.0 (0,41)
6.5 (0,45)
7.0 (0,48)
7.5 (0,52)
7.5 (0,52)
8.0 (0,55)
8.5 (0,59)
9.0 (0,62)

2.0 (0,14)
2.0 (0,14)
2.0 (0,14)
2.0 (0,14)
2.5 (0,17)
2.5 (0,17)
2.8 (0,19)
3.0 (0,21)
3.0 (0,21)
2.0 (0,14)
2.0 (0,14)
2.0 (0,14)
2.0 (0,14)
2.5 (0,17)
2.5 (0,17)
2.8 (0,19)
3.0 (0,21)
3.0 (0,21)
3.0 (0,21)
3.0 (0,21)
3.5 (0,24)
4.0 (0,28)
5.0 (0,34)
5.5 (0,38)
6.5 (0,45)
7.5 (0,52)
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)
9.5 (0,66)
9.5 (0,66)
10 (0,69)
10.5 (0,72)
11 (0,76)
11.5 (0,79)
12 (0,83)
13 (0,90)
14 (0,97)

PRESSURE DROP BELOWSET PRESSURE NEEDEDTO RESEAT PILOT,
PSIG (bar)
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
2.0
2.0
2.0
2.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0

(0,34)(0,34)(0,34)(0,34)(0,34)(0,34)(0,34)(0,34)(0,34)(0,069)(0,069)(0,069)(0,069)(0,069)(0,069)(0,069)(0,069)(0,069)(0,14)(0,14)(0,14)(0,14)(0,21)(0,21)(0,21)(0,21)(0,21)(0,21)(0,21)(0,21)(0,21)(0,21)(0,21)(0,41)(0,41)(0,41)(0,41)(0,41)(0,41)(0,41)(0,41)(0,41)

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 diaphragms is limited to 450 psig (31,0 bar).

7

Type EZR Relief
NONRESTRICTIVE
VENTS AND PIPING

ALTERNATE PILOT
EXHAUST PIPING
TYPE EZR
MAIN VALVEBLOCK VALVETYPE EZR
MAIN VALVEBLOCK VALVEPILOTCONTROL LINE
ALTERNATE
CONTROL LINEBLOCK VALVEHAND VALVECONTROL LINE
PILOT
ALTERNATE PILOT
EXHAUST PIPING

MAIN PRESSURE LINE
B2615

Figure 4. Relief Pressure Control Installation Schematics

Installation

Personal injury, equipment damage, orleakage due to escaping gas or bursting ofpressure-containing parts may result if theType EZR is installed where its capabilities
can be exceeded or where conditions
exceed any ratings of the adjacent piping
or connections. To avoid this, install a
Type EZR relief valve or backpressure
regulator where:• Service conditions are within unit
capabilities (including those in the Specifications section).
• Service conditions are within applicable
codes, regulations, or standards.
Additionally, physical damage to the relief
valve or backpressure regulator could
break the pilot off the main valve, causing
personal injury and property damage due
to escaping gas. To avoid such injury or
damage, install the unit in a safe location.
1. Only personnel qualified through training andexperience should install, operate, and maintain a relief
valve or backpressure regulator. Before installation,
make sure that there is no damage to, or debris in the8

Figure 5. Backpressure Control Installation Schematics

main valve body or pilot. Also, make sure that all
tubing and piping are clean and unobstructed.

When installing Type EZR trim in anexisting Fisher E-body, damage canresult if flow is not in the correct direction. Look at the body web to confirm
that flow is in the correct direction—up
through the center of the cage and down
through the cage slots. Change theexisting flow arrow if necessary.
After assembly, check for shutoff andleakage to atmosphere.
2. A Type EZR relief valve or backpressure regulator
may be installed in any orientation, as long as flow
through it matches the direction of the arrow on themain valve body.
3. Figure 1 shows the standard mounting position.
Rotate the bonnet (key 2, figure 8) or the pilot(figures 15, 16, or 17) for other mounting positions.
4. An upstream control line is required and must be
installed—as shown in figure 5 drawing—into the 1/4inch NPT connection in the pilot body assembly(figure 16), if required. Do not make the upstream
pipeline connection in or directly downstream of a

Type EZR Relief
turbulent area such as a swage, or elbow. A filter may
be installed in the control line upstream of the pilot toprovide clean operating gas. Inspect and clean thisfilter regularly to make sure it is not plugged, which
can prevent proper pilot operation.
5. Apply a good grade of pipe compound to the malepipeline threads for a screwed body, or use suitableline gaskets for a flanged body. Use approved piping
procedures when installing the regulator.

Startup and Shutdown

If pressure is introduced first to the main
valve before the pilot, the main valve may
go wide-open and subject the downstream
system to full inlet pressure.
Note

When used in relief valve service, theType EZR main valve and pilot both
exhaust gas. In hazardous or flammablegas service, personal injury, death, orproperty damage may occur due to fireor explosion of vented gas that has
accumulated. To prevent such injury or
damage, provide piping or tubing to vent
the gas to a safe location. The exhaust
piping must be designed and installed toguard against excessive flow restriction.
This piping must be protected against
condensation or debris that could clog it.
For safety during shutdown, vent valves
are required immediately upstream anddownstream of the main valve on a
backpressure or bypass installation.

The maximum inlet pressure for specificconstructions are given in tables 1, 2, and6 or 7. Use a pressure gauge to monitor
inlet pressure during startup.

Relief Installation (Figure 4)
Startup
1. Close vent valve (not shown).
2. Slowly open block valve and hand valve, if
installed.
3. Adjust the pilot as needed.

Shutdown
1. Close block valve and hand valve, if installed.
2. Slowly open vent valve (not shown).

Backpressure Installation (Figure 5)
Startup

6. If system operation during maintenance isrequired, install isolating and vent valves as needed.
7. If the vent assembly (key 16, figure 13, 14, or 16)
remains in the pilot body (key 1, figure 13 or 15), thenit must be pointed down if possible or otherwise
protected. If the exhaust is to be piped to the main
valve exhaust or remotely vented, remove the ventassembly and install tubing or piping into the 1/4-inch
NPT pilot exhaust connection. Protect the open end of
the exhaust pipe by installing a screened vent cap.
8. The pilot spring case vent (key 16, figure 13, 14
or 16) must be kept open to atmospheric pressure.
Protect the vent assembly from icing, moisture, ordebris that may cause blockage, as required. Tochange the vent orientation, twist the vent assembly inthe spring case. To remotely vent the pilot spring case,remove the vent assembly and install tubing or piping
into the 1/4-inch NPT spring case vent tapping.
Protect the open end of the vent line by installing ascreened vent cap.

1. Close upstream and downstream vent valves(not shown).
2. Slowly open upstream block valve first and thenslowly open downstream block valve.
3. Adjust the pilot as needed. If the pilot is not piped
downstream, make sure the pilot exhaust is pointed in
the correct direction.

Shutdown
1. Close upstream block valve first and then closethe downstream block valve.
2. Open downstream and upstream vent valves(not shown).

Pilot Adjustment (See figure 13 or 14)
If set pressure adjustment is necessary, monitor relief(inlet) pressure with a gauge during the adjustment
procedure. Remove the pilot closing cap (key 12) andloosen the locknut (key 11). Turn the adjusting screw(key 10) into the spring case to increase the set

9Type EZR Relief
pressure. Turn the adjusting screw out of the springcase to decrease the set pressure. When adjustment iscompleted, tighten the locknut to lock the adjustingscrew in position and replace the pilot closing cap.

Maintenance
Relief valve and backpressure regulator parts are
subject to normal wear and must be inspectedperiodically and replaced as necessary. Due to the care
Fisher takes in meeting all manufacturing requirements(heat treating, dimensional tolerances, etc.), use only
replacement parts manufactured or furnished by Fisher.
Also when lubrication is required, use a good quality
lubricant and sparingly coat the recommended parts.
The frequency of inspection and replacement depends
upon the severity of service conditions and upon
applicable codes, government regulations, andcompany standards. Table 8 lists various regulator
problems and possible solutions.

to monitor inlet and outlet pressureswhile releasing these pressures.
Note
The regulator may remain in the pipeline
during maintenance procedures.
Disassembly
1. Shutdown, isolate, and depressurize the main
valve and pilot.
2. Remove the cap screws (key 3). Lift up andremove the bonnet (key 2) from the body (key 1).
3. Remove the diaphragm and plug assembly (key 9)and bonnet O-ring (key 28).
4. Pull out the cage (key 7), O-ring (key 8), and inlet
strainer or strainer shim (if strainer is not used) (key 23).
5. Clean parts and replace if necessary.

Converting a Fisher E-Body to Type EZR:

Avoid personal injury or damage toproperty from sudden release of pressure or uncontrolled gas or other process fluid. Before starting to disassemble, carefully release all pressuresaccording to the appropriate shutdown
procedure. Use a gauge to monitor relief(inlet) pressure while releasing it.

Type EZR Main Valve Maintenance
Trim Parts
Instructions are given for complete disassembly andassembly. Key numbers are referenced in figures 8
through 12 unless otherwise noted.

Remove all trim parts from the main valve and clean the
body interior. Then follow procedure in Assembly
section to convert a Fisher E-body to a Type EZR.

When installing a Type EZR trim package
make sure flow is up through the centerof the cage and down through the cageslots. In some cases, correct flow path isachieved by removing the body from theline and turning it around. If this is done,change the flow arrow to indicate thecorrect direction. Damage may result ifflow is not in the correct direction. Afterassembly, check the regulator for shutoff
and leakage to atmosphere.
Assembly
1. Install the inlet strainer or shim (key 23) into thebody (key 1).

Avoid personal injury or damage toproperty from sudden release of pressureor uncontrolled gas or other process
fluid. Before starting to disassemble,
carefully release all pressures according
to the shutdown procedure. Use gauges

10

Note
For installation in a vertical orientation,
lubricant can be applied to the bottom of
the inlet strainer or shim (key 23) to help
hold parts in place while the cag assembly is installed.

Type EZR Relief
Table 8. Maintenance Tips
PROBLEMPOSSIBLE SOLUTION (SEE FIGURE 6 FOR PARTS LOCATION)

Unit does not provide tight shutoff when
inlet pressure is below set pressure

Check for :• damage or improper installation of the main valve O-rings• erosion or trapped debris on the cage and diaphragm surfaces• damage or debris on the surfaces of the pilot plug and seat

Main valve is wide-open when inlet
pressure is below set pressure

Check for :• debris in the pilot or pilot supply filter• debris in the main valve• main valve and pilot diaphragms for damage

Gas escapes from pilot spring case

• Replace diaphragm assemblyGas escapes from travel indicator• Replace indicator stem O-ring, if indicator is not desired, conver t to a non-travel indicator assemb

Unit does not open when inlet pressure
is above set pressure

Check for :• clogged main valve inlet strainer (if used) or pilot supply filter (if used)• pilot icing or blockage, Types 6358B, 6358EB, and 6358EBH pilots should be exhausting gas• main valve diaphragm damage• proper control line connection, and make sure control line hand valve (if used) is open

Inlet pressure rises higher than expected

Check for :• correct main valve sizing• clogged main valve inlet strainer• restrictive inlet or outlet piping• plugged or restricted control line
• proper control line location (should not be installed in or directly downstream of an elbow or swage)• proper springs in the main valve and pilot

Relief valve opens properly thencloses unexpectedly

Check for :• icing inside the pilot

2. Lightly lubricate and install the cage O-ring (key 8).
3. Apply lubricant lightly to all O-rings or the mating
part before installing them.

bonnet (key 2). See Travel Indicator Assembly Maintenance for maintenance.
7. Install the bonnet (key 2) in proper orientation.

4. Install the cage (key 7) and lightly lubricate andinstall the bonnet O-ring (key 6).
Note
For the 6-inch, secure the cage (key 7) tothe restrictor plate (key 71) using the cap
screws (key 126), using a torque of 10 to
12 foot-pounds (14 to 16 N•m).
5. Lubricate the top and bottom of the outer edge
(bead area) of the diaphragm and place diaphragm andplug assembly (key 9) on the cage (key 7).
6. If travel indicator was removed, lightly lubricate thetravel indicator assembly threads and screw it into theMake sure to use a Type EZR bonnet. The
Type EZR bonnet is NOT interchangeablewith other Fisher E-body bonnets.
Installing an improper bonnet can resultin stem assembly breakage and unit
failure. The bonnet can be identified by
the EZR markings on the top.
8. Lubricate cap screws (key 3) and secure the bonnet(key 2), using an even criss-cross pattern. It may benecessary to push down on the bonnet to start the cap
screws. Tighten cap screws to the proper torque (seetable 9).

11

Type EZR Relief
DIAPHRAGM(KEY 9)BOTTOM PLUG
(KEY 11)

O-RING(KEY 14)

FLANGEDLOCKNUT(KEY 13)
O-RING(KEY 70)

TOP PLUG(KEY 5)O-RING(KEY 10)
W7394

Figure 6. Diaphragm and Plug Assembly Components

Diaphragm and Plug Assembly
MaintenanceThe diaphragm and plug assembly can be replaced
as a single unit (a diaphragm cartridge), or individualcomponents within the assembly can be replaced. Whenreplacing individual components, inspect each component for damage and wear, and replace parts as needed.
Key numbers for the following assembly and disassembly procedure are referenced in figures 6 and 8.
1. Place a screwdriver or similar tool through the holein the top plug (key 5).
2. Remove the flanged locknut (key 13) from thebottom plug (key 11). This loosens the entire assembly.

9. Reassemble in the reverse order. Tighten flange
locknut (key 13) to the proper torque (see table 9).

Travel Indicator Assembly MaintenanceTravel indicator assembly key numbers are referenced
in figures 7, 8, and 12. The indicator assembly can beremoved and installed without removing the bonnet(key 2) from the body (key 1). Travel indicator maintenance is performed for two reasons:a. When damaged or worn parts need replacing.
b. When travel indicator is removed and replacedwith a travel indicator plug assembly.
ug
p.l

Note
On 1-inch bodies, remove the socket headscrew (key 129) and lock washer (key 130)
from the bottom plug.
3. Remove the bottom plug (key 11) and the bottom
plug O-ring (key 10).
4. Remove the diaphragm (key 9).
5. Remove the top plug O-rings (keys 14 and 70).
6. Check all components for damage or wear andreplace as necessary.
7. When reassembling, be sure to lubricate all
O-rings before installing.
8. Hold the top plug (key 5). Place the parts on the
top plug in the following order.
• O-Ring (key 14)• O-Ring (key 70)• Diaphragm (key 9)• O-Ring (key10)• Bottom Plug (key 11)• Flanged Locknut (key 13)

12

Avoid personal injury or damage toproperty from sudden release of pressureor uncontrolled gas or other process fluid.
Before starting to disassemble, carefully
release all pressures according to the
shutdown procedure. Use gauges tomonitor inlet, loading, and outlet pressures while releasing these pressures.
1. Remove the indicator protector (key 22, figure 8)
and indicator cover (key 21).
2. Remove the first hex nut (key 4) and the indicator
washer (key 20).
3. Unscrew the second hex nut (key 4) to the top of
the indicator stem (key 15). Do not remove.
4. Use a wrench to remove indicator fitting (key 19).
5. Lift out travel indicator assembly. If replacing travelindicator with travel indicator plug, skip to step 9.
6. Compress the main spring (key 12). Remove thesecond hex nut (key 4). Parts will separate easily
when the hex nut is removed.

Type EZR Relief
INDICATOR FITTING(KEY 19)
O-RING(KEY 18)

INDICATOR COVER(KEY 21)

UPPER SPRINGSEAT (KEY 17)

MAIN SPRING(KEY 12)
INDICATOR STEM(KEY 15)HEX NUTS(KEY 4)BACKUP RINGS(KEY 16)
W7400_1

INDICATORWASHER (KEY 20)

INDICATOR
O-RING (KEY 6)WASHER (KEY 79)(6-INCH SIZE ONLY)

Figure 7. Travel Indicator Parts
Table 9. Torque Values
BODY SIZE, INCHES
1 (25)TORQUE, FOOT-POUNDS (N•M)
Cap Screws

Flange Lock Nut

Indicator Fitting

Indicator Plug

75 to 95 (102 to 129)

4 to 6 (5,4 to 10,8)

90 to 160 (122 to 217)

90 to 160 (122 to 217)

2 (50)

55 to 70 (75 to 95)

6 to 8 (8 to 10,8)

90 to 160 (122 to 217)

90 to 160 (122 to 217)

3 (80)

100 to 130 (136 to 176)

19 to 25 (25,8 to 33,9)200 to 300 (271 to 407)

200 to 300 (271 to 407)

4 (100)160 to 210 (217 to 285)

19 to 25 (25,8 to 33,9)200 to 300 (271 to 407)

200 to 300 (271 to 407)

6 (150)375 to 425 (509 to 577)

50 to 100 (68 to 136)

300 to 425 (407 to 577)

300 to 425 (407 to 577)

7. Slide the indicator stem (key 15) out of the indicator fitting (key 19). The main spring (key 12) andupper spring seat (key 17) will be free.
8. If necessary, use the indicator stem (key 15) to pry
the backup rings (key 16) and O-ring (key 18) out of
the indicator fitting (key 19).
9. Check the indicator fitting O-ring (key 6). Lubricate
and replace if necessary.
10. To replace travel indicator parts, lubricate all
O-rings, backup rings, and threads. To reassemble,
hold the indicator stem (key 15) and place the parts on
the stem in the following order:• Washer (key 79 for 6-inch size only)• Main Spring (key 12), small end first• Upper Spring Seat (key 17), make sure to place thelarge end toward the spring• First Backup Ring (key 16)• O-Ring (key18)• Second Backup Ring (key 16)• Indicator Fitting (key 19), the backup rings (key 16)
and O-ring (key 18) should slide into the indicatorfitting and the small end of the upper spring seat(key 17) should slide into the indicator fitting.
• First Hex Nut (key 4)• Indicator Washer (key 20)• Second Hex Nut (key 4)

Install the indicator fitting (key 19) into the bonnet (key 2,
figure 8), tighten using the proper torque (see table 9).
To set the travel indicator, hold the indicator cover(key 21) next to the indicator fitting (key 19). Screw
the hex nuts (key 4) and the indicator washer (key 20)
down on the indicator stem (key 15) until the washer iseven with the lowest marking on the indicator cover.
Lightly lubricate the indicator cover threads and install.
Replace the indicator protector (key 22).
To replace the travel indicator with the non-travelindicator option on a 2-inch body, lubricate all
O-rings and threads. Hold the stem (key 15) and installparts on the stem in the following order:• Main Spring (key 12)• Upper Spring Seat (key 17)• Machine Screw (key 83), insert and tighten• Indicator Plug (key 19)
Install the indicator plug (key 19) into the bonnet using
the proper torque (see table 9).
To replace the travel indicator with the non-travelindicator option on a 1, 3, 4, or 6-inch body, place
the main spring (key 12) into the bonnet and install theindicator plug (key 19) using the proper torque (seetable 9).

13

Type EZR Relief
Note6358 Series Pilots
Key numbers are referenced in figure 12, 13, 14 and 15
unless otherwise noted. Unless replacing or removing
the body assembly (key 1), the pilot may remain on
the pipe nipple (key 29, figure 15) during maintenance.

In step 3, if installing a different size
restriction, be sure to remove the code
letter on the bottom of the pilot andindicate the new letter.
3. If the restriction or restriction plug (key 20) wasremoved, coat the threads with lubricant and install it.

Avoid personal injury or damage toproperty from sudden release of pressure or uncontrolled gas or other process fluid. Before starting to disassemble, carefully release all pressuresaccording to the shutdown procedure.
Use gauges to monitor inlet, loading,and outlet pressures while releasingthese pressures.

Disassembly
1. If necessary to check the outlet end of the body
cavity and the seating surfaces for moisture or debris,remove the body plug (key 3) and body plug O-ring(key 13) from the body (key 1).

4. If replacing the stem O-ring (key 37), sparingly
apply lubricant and install the O-ring over the valve
plug (key 4).
5. If removed, install the valve plug (key 4) and valve
spring (key 14) into the diaphragm assembly (key 5).
Install a replacement connector cap O-ring or gasket(key 36) on the diaphragm assembly, and secure withthe connector cap (key 6).
6. Install the diaphragm assembly (key 5) and pushdown on it to see if the valve plug (key 4) moves
smoothly. The diaphragm assembly should stroke
approximately 1/16-inch (2 mm) after the valve plug
contacts the port.
Note

2. Remove the closing cap (key 12), loosen the
locknut (key 11), and back out the adjusting screw(key 10) until compression is removed from the control
spring (key 7).

In step 7, if installing a control spring of adifferent set pressure range, be sure to
remove the set pressure range on thespring case and indicate the new range.

3. Remove the machine screws (key 17) andseparate the spring case (key 2) from the bodyassembly. Remove the control spring seat (key 8), thecontrol spring (key 7), and, if used, the diaphragm
limiter (key 40).

7. Stack the control spring (key 7), the control springseat (key 8), and, if used, the diaphragm limiter(key 40) onto the diaphragm assembly (key 5). Make
sure to install the diaphragm limiter beveled side up.

4. Lift out the diaphragm assembly (key 5) and valve
plug (key 4). Check the stem guide (key 9) and
restriction (key 20) for damage or plugging. The
Type 6358 has a restriction plug, not a restriction.

8. Install the spring case (key 2) on the body (key 1)
with the vent assembly (key 16) oriented to prevent
clogging or entrance of moisture. Install the machine
screws (key 17) and tighten in a crisscross pattern,using 5 to 7 foot-pounds (7 to 9 N•m) of torque.

5. If necessary to replace the diaphragm assembly,
the valve plug (key 4), the valve spring (key 14), or
the stem O-ring (key 37), remove the connector cap(key 6) and connector cap O-ring or gasket (key 36)
from the top of the diaphragm assembly.

Assembly
1. If removed, install the body plug O-ring (key 13)
over the body plug (key 3), and install the body plug
into the body (key 1).
2. Install the stem guide (key 9), if removed, andmake sure to install the connector cap O-ring or gasket(key 36) between the body (key 1) and the stem guide.

14

9. Replace the closing cap gasket (key 19) if
necessary, and install the closing cap (key 12). When
all maintenance is complete, refer to the Startup andShutdown section to put the relief valve orbackpressure regulator into operation and adjust thepressure setting.

Parts Ordering
When corresponding with your Fisher Sales Office orSales Representative about this unit, provide the serial
number or FS number from the nameplate (key 24,
figure 8). When ordering replacement parts, reference
the eleven digit part number of each part.

Type EZR Relief
Parts List

Key

Description

6*

O-Ring1-inch (DN 25) body
Nitrile (NBR)
Fluoroelastomer (FKM)
2-inch (DN 50) body
Nitrile (NBR)
Fluoroelastomer (FKM)
3-inch (DN 80) body
Nitrile (NBR)
Fluoroelastomer (FKM)
4-inch (DN 100) body
Nitrile (NBR)
Fluoroelastomer (FKM)
6-inch (DN 150) body
Nitrile (NBR)
Fluoroelastomer (FKM)Cage
1-inch (DN 25) body2-inch (DN 50) body
3-inch (DN 80) body4-inch (DN 100) body
6-inch (DN 150) bodyCage O-Ring
1-inch (DN 25) body
Nitrile (NBR)
Fluoroelastomer (FKM)
2-inch (DN 50) body
Nitrile (NBR)
Fluoroelastomer (FKM)
3-inch (DN 80) body
Nitrile (NBR)
Fluoroelastomer (FKM)
4-inch (DN 100) body
Nitrile (NBR)
Fluoroelastomer (FKM)
6-inch (DN 150) body
Nitrile (NBR)
Fluoroelastomer (FKM)
Diaphragm
1-inch (DN 25) body
17E97 Nitrile (NBR), high-pressure
2-inch (DN 50) body
17E67 Nitrile (NBR), general purpose
17E68 Nitrile (NBR), low temperature
17E97 Nitrile (NBR), high-pressure
17E88 Fluoroelastomer (FKM)
3-inch (DN 80) body
17E67 Nitrile (NBR), general purpose
17E68 Nitrile (NBR), low temperature
17E97 Nitrile (NBR), high-pressure
17E88 Fluoroelastomer (FKM)
4-inch (DN 100) body
17E67 Nitrile (NBR), general purpose
17E68 Nitrile (NBR), low temperature
17E97 Nitrile (NBR), high-pressure
17E88 Fluoroelastomer (FKM)
6-inch (DN 100) body
17E97 Nitrile (NBR)
O-Ring1-inch (DN 25) body
Nitrile (NBR)
Fluoroelastomer (FKM)
2-inch (DN 50) body
Nitrile (NBR)
Fluoroelastomer (FKM)
3 and 4-inch (DN 80 and 100) body
Nitrile (NBR)
Fluoroelastomer (FKM)
6-inch (DN 100) body
Nitrile (NBR)
Fluoroelastomer (FKM)
Bottom Plug
1-inch (DN 25) body2-inch (DN 50) body
3-inch (DN 80) body4-inch (DN 100) body
6-inch (DN 150) bodyType EZR Main Valve (figures 8 - 12)
Parts Kits
Diaphragm Cartridge and O-Rings
1-inch (DN 25)
17E68 Nitrile (NBR)
17E97 Nitrile (NBR)
17E88 Fluoroelastomer (FKM)
2-inch (DN 50)
17E67 Nitrile (NBR)
17E68 Nitrile (NBR)
17E97 Nitrile (NBR)
17E88 Fluoroelastomer (FKM)
3-inch (DN 80)
17E67 Nitrile (NBR)
17E68 Nitrile (NBR)
17E97 Nitrile (NBR)
17E88 Fluoroelastomer (FKM)
4-inch (DN 100)
17E67 Nitrile (NBR)
17E68 Nitrile (NBR)
17E97 Nitrile (NBR)
17E88 Fluoroelastomer (FKM)
6-inch (DN 150)
17E97 Nitrile (NBR)
17E68 Nitrile (NBR)
17E88 Fluoroelastomer (FKM)
Diaphragm and O-Rings (Included arekeys 6, 8, 9, 10, 13, 14, 18, 28, and 70)
1-inch (DN 25)
17E68 Nitrile (NBR)
17E97 Nitrile (NBR)
17E88 Fluoroelastomer (FKM)
2-inch (DN 50)
17E67 Nitrile (NBR)
17E68 Nitrile (NBR)
17E97 Nitrile (NBR)
17E88 Fluoroelastomer (FKM)
3-inch (DN 80)
17E67 Nitrile (NBR)
17E68 Nitrile (NBR)
17E97 Nitrile (NBR)
17E88 Fluoroelastomer (FKM)
4-inch (DN 100)
17E67 Nitrile (NBR)
17E68 Nitrile (NBR)
17E97 Nitrile (NBR)
17E88 Fluoroelastomer (FKM)
6-inch (DN 150)
17E97 Nitrile (NBR)
1
2

3

4
5

19B2408X022
REZRX00CS12
19B2408X042
REZRX00CS22
18B5959X012
18B5959X022
18B5959X032
REZRX00CS32
18B9884X022
18B9884X032
18B9884X042
REZRX00CS42
18B8508X022
18B8508X032
18B8508X042

78*

REZRX00CS62
19B2840X012
19B2840X032

19B2412X022
REZRX000S12
19B2412X042
REZRX000S22
18B5952X012
18B5952X022
18B5952X032

9*

REZRX000S32
18B9885X022
18B9885X032
18B9885X042
REZRX000S42
18B8507X022
18B8507X032
18B8507X042
REZRX00CS62

Valve Body
See table 11
Bonnet Assembly
1-inch (DN 25) body
39B2403X022
2-inch (DN 50) body
38B2122X022
3-inch (DN 80) body
38B5963X022
4-inch (DN 100) body
38B2133X022
6-inch (DN 150) body
49B0355X022
Cap Screw
1-inch (DN 25) body (4 required)
1R281124052
2-inch (DN 50) body (8 required)
1A453324052
3-inch (DN 80) body (8 required)
1A454124052
4-inch (DN 100) body (8 required)
1A440224052
6-inch (DN 150) body (12 required)
1U513124052
Hex Nut (2 required)
1 and 2-inch (DN 25 and 50) body
1H322228982
3, 4, and 6-inch (DN 80, 100, and 150) body 1L286338992
Top Plug
1-inch (DN 25) body
29B2404X012
2-inch (DN 50) body
28B2130X012
3-inch (DN 80) body
28B8511X012
4-inch (DN 100) body
28B5964X012
6-inch (DN 150) body
39B0370X012

10*

11

Part Number

18B3438X012
1N430306382
18B3438X012
1N430306382
10A8931X012
10A8931X052
10A8931X012
10A8931X052
10A3800X012
1R727606382
39B2413X012
37B9748X012
48B5961X012
48B2135X012
49B0353X012
14A5713X012
13A2351X012
10B4428X012
10B4428X022
10B4366X012
10B4366X022
10B4373X012
10B4373X022
1H862306992
1H8623X0022
39B2397X012
29B2715X022
29B1909X012
28B2123X052
29B2715X012
39B2726X022
38B9886X012
39B2726X012
38B8512X022
38B5965X012
38B8509X012
38B5965X042
39B1154X012
49B0357X012
1E216306992
1L949306382
1E216306992
1L949306382
1J4888X0052
1J4888X0032
11A8741X052
11A8741X012
19B2407X012
18B2127X012
18B8513X012
18B5966X012
29B0763X012*Recommended Spare Part15

Type EZR Relief
Key

Description

Part Number

Key

Description

12

Main Spring
1-inch (DN 25) bodyWhite
19B2399X012
Light Blue
19B2400X012
Black
19B2401X012
2-inch (DN 50) body
Yellow
19B0951X012
Green
18B2126X012
Red
18B5955X012
3-inch (DN 80) body
Yellow
T14184T0012
Light Blue
19B0781X012
Black
19B0782X012
4-inch (DN 100) body
Yellow
T14184T0012
Green
18B8501X012
Red
18B8502X012
6-inch (DN 150) body
Yellow
19B0364X012
Green
19B0366X012
Red
19B0365X012
Flanged Locknut
2-inch (DN 50) body
18B2139X012
3 and 4-inch (DN 80 and 100) body
15A7591X012
6-inch (DN 150) body
19B0361X012
Top Plug O-Ring
1-inch (DN 25) body
Nitrile (NBR)
13A1584X052
Fluoroelastomer (FKM)
13A1584X022
2-inch (DN 50) body
Nitrile (NBR)
13A1584X052
Fluoroelastomer (FKM)
13A1584X022
3 and 4-inch (DN 80 and 100) body
Nitrile (NBR)
10A3803X062
Fluoroelastomer (FKM)
10A3803X032
6-inch (DN 150) body
Nitrile (NBR)
T12050X0012
Fluoroelastomer (FKM)
T12050X0022
Stem
1-inch (DN 25) body
18B2125X012
2-inch (DN 50) bodywith travel indicator
18B2125X012
without travel indicator
18B5957X012
3 and 4-inch (DN 80 and 100) body
28B5967X012
6-inch (DN 150) body
29B0366X012
Backup Ring (2 required)
1 and 2-inch (DN 25 and 50) body
1N659106242
3, 4, and 6-inch (DN 80, 100, and 150) body 1J418806992
Upper Spring Seat
1-inch (DN 25) body
18B2129X012
2-inch (DN 50) bodywith Travel Indicator
18B2129X012
without Travel Indicator
18B5958X012
3 and 4-inch (DN 80 and 100) body
18B5968X012
6-inch (DN 150) body
29B0764X012
O-Ring1 and 2-inch (DN 25 and 50) body
Nitrile (NBR)
1H2926X0032
Fluoroelastomer (FKM)
1H2926X0022
3, 4, and 6-inch (DN 80, 100, and 150) body
Nitrile (NBR)
1D191706992
Fluoroelastomer (FKM)
1N423906382
Indicator Fitting
1 and 2-inch (DN 25 and 50) body
28B2128X012
3 and 4-inch (DN 80 and 100) body
28B5969X012
6-inch (DN 150) body
39B0358X012
Indicator Plug
1-inch (DN 25) body
19B2409X012
2-inch (DN 50) body
28B2137X012
3 and 4-inch (DN 80 and 100) body
28B5970X012
6-inch (DN 150) body
39B0767X012
Indicator Washer
1 and 2-inch (DN 25 and 50) body
18B2138X012
3, 4, and 6-inch (DN 80, 100, and 150) body 18B8503X012

21

Indicator Cover
1 and 2-inch (DN 25 and 50) body
14A6759X012
3 and 4-inch (DN 80 and 100) body
19B2270X012
6-inch (DN 150) body
14A5647X012
Indicator Protector
1 and 2-inch (DN 25 and 50) body
24B1301X012
3, 4, and 6-inch (DN 80, 100, and 150) body 29B2269X012
Inlet Strainer
1-inch (DN 25) body
20B8004X012
2-inch (DN 50) body
10B4409X012
3-inch (DN 80) body
20B4367X012
4-inch (DN 100) body
20B4374X012
6-inch (DN 150) body
20B7853X012
Strainer Replacement Shim
1-inch (DN 25) body
13B8061X012
2-inch (DN 50) body
13B8062X012
3-inch (DN 80) body
13B8063X012
4-inch (DN 100) body
13B8064X012
6-inch (DN 150) body
13B8065X012
Nameplate----------Flow Arrow
1V105938982
Drive Screw (5 required)
1A368228982
O-Ring1-inch (DN 25) body
Nitrile (NBR)
19B2838X012
Fluoroelastomer (FKM)
19B2838X022
2-inch (DN 50) body
Nitrile (NBR)
18B2124X012
Fluoroelastomer (FKM)
18B2124X022
3-inch (DN 80) body
Nitrile (NBR)
18B8514X012
Fluoroelastomer (FKM)
18B8514X022
4-inch (DN 100) body
Nitrile (NBR)
18B2140X012
Fluoroelastomer (FKM)
18B2140X022
6-inch (DN 150) body
Nitrile (NBR)
19B0359X012
Fluoroelastomer (FKM)
10A3591X012
Pilot Supply Pipe Plug (2 required)
1A767524662
Bonnet Pipe Plug
1A767524662
O-Ring2-inch (DN 50) body
Nitrile13A1584X052
Fluoroelastomer
13A1584X022
3 and 4-inch (DN 80 and 100) body
Nitrile (NBR)
10A3803X062
Fluoroelastomer (FKM)
10A3803X032
6-inch (DN 150) body
Nitrile (NBR)
T12050X0012
Fluoroelastomer (FKM)
T12050X0022
Restrictor Plate
1-inch (DN 25) body
For 60% Capacity Trim
19B2835X012
For 30% Capacity Trim
19B2836X012
2-inch (DN 50) body
For 60% Capacity Trim
18B2144X012
For 30% Capacity Trim
18B2145X012
3-inch (DN 80) body
For 60% Capacity Trim
28B8516X012
For 30% Capacity Trim
28B8517X012
4-inch (DN 100) body
For 60% Capacity Trim
28B8504X012
For 30% Capacity Trim
28B8505X012
6-inch (DN 150) body
For 100% Capacity Trim
49B0367X012
For 60% Capacity Trim
49B0368X012
For 30% Capacity Trim
49B0369X012
E-Ring, for Restricted Trim
1-inch (DN 25) body
19B2411X012
2-inch (DN 50) body
16A7882X012
3-inch (DN 80) body
18B8518X012
4-inch (DN 100) body
18B8506X012
Washer (6-inch body only)
19B0362X012
Machine Screw (2-inch only)
18B5956X012
Cap Screw (4 required) (6-inch body only)
1L7325X0042
Socket Head Screw
1D6170X0012
Lock Washer
1K623638992

13

14*

15

16

17

18*

19

19

20

16

22
23

23

24
25
26
28*

63
64
70*

71

72

79
83
126
129
130

Part Number

Type EZR Relief
Table 10. Type EZR Main Valve Body Part Numbers (Key 1)
BODY STYLE
BODY SIZE

1-inch
(DN 25)

BODY MATERIALWCB SteelCast iron2-inch
(DN 50)WCB SteelCast iron3-inch
(DN 80)WCB SteelCast iron4-inch(DN 100)
WCB SteelCast iron6-inch(DN 150)
WCB SteelEND CONNECTION STYLE

Standard

Tapped Inlet(Pilot Supply)

Tapped Inlet andTapped Outlet
---

NPT

2R271222012

11B5668X022

SWE

2R271122012

11B5668X032---

ANSI Class 150 RF

2R270322012

11B5669X032

14B5623X032

ANSI Class 300 RF

2R270522012

11B5669X042

14B5623X042

ANSI Class 600 RF

2R270722012

11B5669X052

14B5623X052

SCH 40 BWE

2R270922012

11B6273X012---

SCH 80 BWE

2R271022012

11B6273X022

---

NPT

2R319019022

11B0751X012---

ANSI Class 125 FF

2R318819012

11B0752X012

14B5834X012

ANSI Class 250 RF

2R318919022

11B0752X022

14B5834X022

NPT

2R315422012

11B0751X022

---

SWE

2R315322012

11B0751X032---

ANSI Class 150 RF

2R314522012

11B0752X032

14B5834X032

ANSI Class 300 RF

2R314722012

11B0752X042

14B5834X042

ANSI Class 600 RF

2R314922012

11B0752X052

14B5834X052

SCH 40 BWE

2R315122012

11B6274X012

14B5834X072

SCH 80 BWE

2R315322012

11B6274X022---

ANSI Class 125 FF

2R340919022

11B0753X012

14B5835X012

ANSI Class 250 RF

2R341019022

11B0753X022

14B5835X022

ANSI Class 150 RF

2R337522012

11B0753X032

14B5835X032

ANSI Class 300 RF

2R337722012

11B0753X042

14B5835X042

ANSI Class 600 RF

2R337922012

11B0753X052

14B5835X052

SCH 40 BWE

2R338122012

11B6275X012

14B5835X062

SCH 80 BWE

2R338222012

11B6275X022---

ANSI Class 125 FF

2R356719022

11B0754X012

14B5836X012

ANSI Class 250 RF

2R356819022

11B0754X022

14B5836X022

ANSI Class 150 RF

2R352722012

11B0754X032

14B5836X032

ANSI Class 300 RF

2R352922012

11B0754X042

14B5836X042

ANSI Class 600 RF

2R353322012

11B0754X052

14B5836X052

SCH 40 BWE

2R353522012

11B6276X012---

SCH 80 BWE

2R353622012

11B6276X022---

ANSI Class 125 FF

2U503019022

11B0755X012

24B5837X012

ANSI Class 250 RF

24A7700X012

11B0755X022

24B5837X022

ANSI Class 150 RF

2U501222012

11B0755X032

24B5837X032

ANSI Class 300 RF

2U501322012

11B0755X042

24B5837X042

ANSI Class 600 RF

2U501522012

11B0755X052

24B5837X052

SCH 40 BWE

2U501022012

11B6277X012

24B7756X012

SCH 80 BWE

2U501122012

11B6277X022

27B7259X012

17

Type EZR Relief
TOP PLUG (KEY 5)
O-RING (KEY 14)
O-RING (KEY 70)
DIAPHRAGM (KEY 9)

BOTTOM PLUG (KEY 11)
O-RING (KEY 10)
LOCK WASHER (KEY 130)
SOCKET HEAD SCREW (KEY 129)

1-INCH DIAPHRAGM ASSEMBLY

MAIN VALVE ASSEMBLY FOR 1, 2, 3, and 4-INCH BODY SIZES
B2617_2

Figure 8. Type EZR Main Valve with Travel Indicator18Type EZR Relief

MAIN VALVE ASSEMBLY FOR 6-INCH BODY SIZES

Figure 8. Type EZR Main Valve with Travel Indicator (continued)

19

Type EZR Relief

B2617_A2

Figure 9. Type EZR Nameplate and Flow Arrow

B2617_D

B2617_C

Figure 10. Type EZR Restricted Trim

Figure 11. Type EZR Cage O-Ring Placement

3

B2517_B

2-INCH BODY SIZE

33

B2617_E

1, 3, AND 4-INCH BODY SIZES

Figure 12. Type EZR Travel Indicator Plug Option

20

6-INCH BODY SIZEType EZR Relief

A6920
B2619-2

TYPE 6358 PILOT INTERIOR VIEWTYPE 6358B PILOT INTERIOR VIEW

Figure 13. Type 6358 and 6358B Pilots

6358 Series Pilots (figures 13, 14, 15
and 16)
Key

Description

Part Number

1
2

Pilot Body, CF8M Stainless steel
Spring Case, CF8M Stainless steel
Types 6358 and 6358B
Types 6358EB and 6358EBH
Body Plug, S30300 Stainless steel
Valve Plug
Types 6358 and 6358B
Nitrile plug with stainless steel stem
Fluoroelastomer plug with stainlesssteel stem
Types 6358EB or 6358EBH
Nitrile plug with stainless steel stem
Fluoroelastomer plug with stainlesssteel stem
Diaphragm Assembly
Types 6358 and 6358B
Nitrile (NBR)
Fluoroelastomer (FKM)
Type 6358EB
Nitrile (NBR)
75 to 200 psig (5,2 to 13,8 bar)
180 to 350 psig (12,4 to 24,2 bar)
Fluoroelastomer (FKM)
75 to 200 psig (5,2 to 13,8 bar)
180 to 350 psig (12,4 to 24,2 bar)
Type 6358EBH, Nitrile

39A5972X012

3
4*

5*

28A9277X012
27B9722X012
1B7975X0052

Key

Description

6

Connector Cap, Stainless steel
Types 6358 and 6358B
Types 6358EB or 6358EBH
Control Spring
Type 6358
20 to 40 psig (1,4 to 2,8 bar), Yellow
35 to 125 psig (2,4 to 8,6 bar), Red
Type 6358B
20 to 40 psig (1,4 to 2,8 bar), Yellow
35 to 125 psig (2,4 to 8,6 bar), Red
Type 6358EB
75 to 140 psig (5,2 to 9,7 bar), Green
130 to 200 psig (9,0 to 13,8 bar), Blue
180 to 350 psig (12,4 to 24,1 bar), Red
Type 6358EBH
250 to 450 psig (17,3 to 31,1 bar), Blue
400 to 600 psig (27,6 to 41,4 bar), Red
Spring Seat, Zinc-plated steel
Types 6358 and 6358B
Types 6358EB or 6358EBH
Stem Guide, Stainless steel
Adjusting Screw
Type 6358B
Type 6358EB
75 to 200 psig (5,2 to 13,8 bar)
180 to 350 psig (12,4 to 24,1 bar)
Type 6358EBH

7

14B6372X012
16A2924X012
18B3427X012
18B3427X022

15A6216X072
15A6216X172

18B3428X012
18B3428X022
18B3428X042
18B3428X052
18B3429X012

8

9
10

Part Number
16A2921X012
14B9813X012

1E392527022
1K748527202
1E392527022
1K748527202
17B1261X012
17B1263X012
17B1264X012
17B1263X012
17B1264X012
1B798525062
17B0515X012
16A2923X012

17B1227X012
10B3081X012
10B3081X012*Recommended Spare Part21

Type EZR Relief

B2620-2
B2621-2

TYPE 6358EB PILOT INTERIOR VIEWTYPE 6358EBH PILOT INTERIOR VIEW

A6920

DETAIL OF TYPE 6358EB PILOT DIAPHRAGM LIMITER
FOR 180 TO 350 PSIG (12,4 TO 24,1 bar)
SET PRESSURE RANGE INTERIOR VIEW

Figure 14. Type 6358EB and 6358EBH Pilots

22

Type EZR Relief

B2619-1

TYPE 6358 AND 6358B PILOTS EXTERIOR VIEW

B2620-1

B2621-1

TYPE 6358EB PILOT EXTERIOR VIEWTYPE 6358EBH PILOT EXTERIOR VIEW

Figure 15. 6358 Series Pilots Exterior View

23

Type EZR Relief
Key

Description

11

Locknut
Types 6358 and 6358B
Types 6358EB or 6358EBH
Closing Cap
Types 6358 and 6358B
Types 6358EB or 6358EBH
Body Plug O-ring
Nitrile (NBR)
Fluoroelastomer (FKM)
Valve SpringO-ring (Type 6358EBH only)
Vent Assembly, Y602X1-A12 (2 required)
Machine Screw (6 required)
Types 6358 and 6358B
Type 6358EB
Type 6358EBH
O-ring (Types 6358EB and 6358EBH)
Nitrile (NBR)
Fluoroelastomer (FKM)
Closing Cap Gasket (Types 6358 and 6358B)
Restriction Plug (Type 6358)
Restriction
Type 6358B
High gain, Brass
Medium gain, Stainless steel
Low gain, Carbon steel
Type 6358EB or 6358EBH
High gain
Low gain
Stem Guide Gasket, Fluoroelastomer (FKM)
Connector Cap O-ring or Gasket
Fluoroelastomer (FKM)
Stem O-ring
Nitrile (NBR)
Fluoroelastomer (FKM)
Lower Spring Seat, Thermoplastic
Types 6358EB and 6358EBH
Diaphragm Limiter for Type 6358EB at
180 to 350 psig (12,4 to 24,1 bar)

12

13*

14
15*
16
17

18*

19*
20
20

36*
36*
37

38
40

Part Number
1A946324122
1D667728982
1H2369X0032
24B1301X012
1F113906992
1N463906382
17A2328X012
10A7777X012
27A5515X012
10B6189X022
1A7641X0022
1C8559X0022
10A0904X012
10A0904X032
15A6218X012
1A346128982

B2044-3

VENT ASSEMBLY

17A7270X012
17A2029X022
17A7277X012

29

17A7279X012
17A2030X012
1U1716X0012
1U1716X0012
16A2920X012
16A2920X022
18B1248X012
10B4407X012

Pilot Mounting Parts (figure 16)
30B4383

Key

Description

Part Number

STANDARD PILOT MOUNTINGSTANDARD PILOT MOUNTING
29

Mounting Pipe Nipple

1N624026232

OPTIONAL QUICK DISCONNECT UNION PILOT MOUNTING
29
80
81

Mounting Pipe Nipple
Union
Nipple1C559926232
1B860799012
1C678926232

29
80
34B7733A81

OPTIONAL QUICK DISCONNECT
UNION PILOT MOUNTING*Recommended Spare Part

Figure 16. Pilot Mounting Parts©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