Emerson Fisher EZL Series User manual

Type EZL
Instruction Manual
D104251X012
August 2019
Introduction
Scope of the Manual
This manual provides installation, startup, maintenance and
parts ordering information for the Type EZL relief valve or
backpressure regulator. Information on other equipment
used with this regulator is found in separate manuals.
Product Description
Type EZL relief valves or backpressure regulators are
accurate pilot-operated, pressure balanced and soft seated
regulators. They are designed for use in natural gas
distribution applications such as district regulating stations
and commercial/industrial meter sets. They provide low
differential, smooth, reliable operation, tight shutoff and
long life.
Type EZL Relief Valve or Backpressure Regulator
W8962
Figure 1. Type EZL Relief or Backpressure Regulator

2
Type EZL
Specifications
The Specifications section lists the specifications for Type EZL relief valve or backpressure regulator. Factory specifications
for specific relief valve or backpressure regulator constructions are stamped on the nameplate fastened to either the main
actuator or the pilot spring case.
Body Sizes, End Connection Styles and
Pressure Ratings(1)
See Table 1
Maximum Pressures(1)
Inlet and Outlet (Design): 290 psig / 20 bar
Emergency (Design Casing): 290 psig / 20 bar
Operating Differential: 290 psid / 20 bar d
Relief Set Pressure Ranges
See Table 2
Minimum Differential Pressure(1)
Temperature Capabilities(1)
Nitrile (NBR) Version: -20 to 180°F / -29 to 82°C
Fluorocarbon (FKM) Version: 0 to 180°F / -18 to 82°C
Options
• Travel Indicator
TRIM, PERCENT
OF CAPACITY
MINIMUM DIFFERENTIAL
FOR FULL STROKE
2 In. /
DN 50
3 and 4 In. /
DN 80 and 100
100 2.9 psid / 0.204 bar d 2.9 psid / 0.204 bar d
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
Table 1. Main Valve Body Sizes, End Connection Styles and Body Ratings
MAIN VALVE BODY SIZE MAIN VALVE BODY MATERIAL END CONNECTION STYLE STRUCTURAL DESIGN RATING(1)
psig bar
2, 3 and 4 in. /
DN 50, 80 and 100
WCC Steel
NPT(2) or SWE(2) 1500 103
CL150 RF 290 20.0
CL300 RF 750 51.7
CL600 RF or BWE 1500 103
Cast iron NPT(2) 400 27.6
CL125 FF 200 13.8
1. Structural design rating is the rating for the main valve body. The Type EZL complete assembly is limited to 290 psig / 20 bar.
2. Available only on 2 in. / DN 50 body.
Table 2. Relief Set Pressure Ranges
PILOT TYPE
RELIEF SET PRESSURE
RANGE(1) SPRING PART
NUMBER
SPRING
COLOR
SPRING WIRE DIAMETER SPRING FREE LENGTH
psig bar In. mm In. mm
6358B
3 to 18 0.21 to 1.2 1B986027212 Green 0.120 3.05 2.12 53.8
15 to 40 1.0 to 2.8 1E392527022 Yellow 0.148 3.76 2.00 50.8
35 to 125 2.4 to 8.6 1K748527202 Red 0.187 4.75 2.19 55.6
6358EB
85 to 140 5.9 to 9.6 17B1261X012 Green 0.225 5.72 3.70 94.0
130 to 200 9.0 to 13.8 17B1263X012 Blue 0.262 6.65 3.85 97.8
180 to 350 12.4 to 24.1 17B1264X012 Red 0.294 7.47 4.22 107
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.

3
Type EZL
Principle of Operation
A pressure relief valve is a throttling pressure control device
that opens and closes to ensure the inlet pressure does not
rise above a predetermined pressure. 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 Valve
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 and registers
as loading pressure on top of the main valve diaphragm and
plug assembly. Force from the main spring, in addition to
pilot loading pressure, 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 the pilot
control spring and opens the pilot valve plug. The pilot then
exhausts the loading pressure from the top of 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.
As the inlet pressure drops below the set pressure, the pilot
control spring closes the pilot valve plug and the exhaust
to atmosphere stops. Force from the main spring, along
with pilot loading pressure, pushes the diaphragm and plug
assembly onto the knife edged seat, producing tight shutoff.
Backpressure Regulator
As long as inlet pressure remains below setpoint, the
pilot control spring keeps the pilot valve plug closed. Inlet
pressure passes through the upper port around the upper
portion of the valve plug and then through the hollow
passage in that valve plug. Force from the main 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 loading pressure from the
top of the main valve diaphragm. Inlet pressure unbalance
overcomes the main spring force to open the diaphragm and
plug assembly.
TYPE 6358 PILOT
TYPE EZL MAIN VALVE
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
LOADING PRESSURE
M1161_08/2015
Figure 2. Type EZL Relief Valve or Backpressure Regulator

4
Type EZL
WARNING
!
WARNING
!
CAUTION
While the main valve is throttling, the upper port of the pilot
stays closed. The pilot exhausts only when it repositions the
main valve. As inlet pressure drops below setpoint, the pilot
control spring overcomes the diaphragm force to stroke the
valve plug down to close the lower port and open the upper
port. Force from the main spring, along with pilot loading
pressure, pushes the diaphragm and plug assembly onto the
knife edged seat, producing tight shutoff.
Installation
Personal injury or equipment damage, due
to bursting of pressure-containing parts may
result if this relief valve or backpressure
regulator is overpressured or is installed
where service conditions could exceed the
limits given in the Specification section and
on the appropriate nameplate or where
conditions exceed any rating of the adjacent
piping or piping connections. Also, be sure
the installation is in compliance with all
applicable codes and regulations.
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 bursting
of pressure-containing parts. To avoid such
injury and damage, install the relief valve or
backpressure regulator in a safe location.
1. Only personnel qualified through training and
experience should install, operate and maintain a relief
valve or bakpressure regulator. Before installation, make
sure that there is no damage to or debris in the main
valve body or pilot. Also, make sure that all tubing and
piping are clean and unobstructed.
2. Install the relief valve or backpressure regulator so
that the flow arrow on the main valve matches the
flow direction of process fluid through the regulator.
Type EZL may be installed in any position, but it is
normally installed in a horizontal pipeline with the pilot or
pilots above the body.
3. Apply pipe compound to the external pipeline
threads before installing a regulator with threaded
end connections. Use gaskets between pipeline and
regulator flanges when installing a relief valve or
backpressure regulator with flanged end connections.
When installing buttweld end connections, remove trim
before welding and make sure to use approved welding
practices. Use approved piping procedures when
installing the relief valve or backpressure regulator.
When used in relief valve service, the
Type EZL main valve and pilot both exhaust
gas. In hazardous or flammable gas service,
personal injury, death or property damage
may occur due to fire or 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 to
guard 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
and downstream of the main valve on a
backpressure or bypass installation.
4. A relief valve always must be installed so that the pilot
will exhaust properly and into a safe place. The pilot
spring case vent must be kept open to atmospheric
pressure. Protect this vent from icing, moisture or other
blockage as required. If the pressed-in vent assembly
remains in the pilot exhaust port, it must be pointed
down if possible or otherwise protected.
5. If the exhaust is to be piped to the main valve outlet or
remotely vented, remove the vent assembly and install
obstruction-free tubing or piping with a minimum number
of bends into the 1/4 in. NPT pilot exhaust connection.
Provide protection on a remote vent by installing a
screened vent cap into the remote end of the vent pipe.
6. If using pipe, apply a good grade of pipe compound
to the male pipe threads before making the
connection. Install tubing or piping into the appropriate
pilot connection.
7. Set pressure is defined as the pressure at which the
pilot starts-to-discharge. The set pressure of a unit is
adjusted by changing the control spring compression on
the pilot.
8. The pilot is factory-set for the set pressure specified
on the order. If no setting is specified, set pressure is
factory-set at midrange of the spring range.
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.

5
Type EZL
CAUTION
WARNING
!
CAUTION
Note
The maximum inlet pressure for specific
constructions are given in Specifications
section. Use a pressure gauge to monitor
inlet pressure during startup.
Relief Installation
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
Startup
1. Close upstream and downstream vent valves
(not shown).
2. Slowly open upstream block valve first and then slowly
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 close the
downstream block valve.
2. Open downstream and upstream vent valves
(not shown).
Pilot Adjusment (Figures 5 and 6)
If set pressure adjustment is necessary, monitor relief (inlet)
pressure with a gauge during the adjustment procedure.
Remove the pilot closing cap (key 12) and loosen the locknut
(key 11). Turn the adjusting screw (key 10) into the spring
case to increase the set pressure. Turn the adjusting screw
out of the spring case to decrease the set pressure. When
adjustment is completed, tighten the locknut to lock the
adjusting screw in position and replace the pilot closing cap.
Maintenance
Relief valve or backpressure regulator parts are subject
to normal wear and must be inspected periodically 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 Emerson. 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 and company standards.
To avoid personal injury or property
damage from sudden release of pressure,
isolate the regulator from the pressure
system and release all pressure from the
pilot and main valve before performing
maintenance operations.
When disassembling the upper and lower
actuator, always remove the long cap screws
(key 39) last to allow spring tension force to
be released in a slow and controlled manner.
Use proper lifting techniques, when lifting
the upper and lower actuator casings
(keys 11 and 5) off the Type EZL body (key 1).
The 2 in. / DN 50 actuator assembly weighs
more than 40 lbs / 18 kg.
Type EZL (Figure 4)
Seat Maintenance
1. Make a mark on the lower actuator casing (key 5),
intermediate flange (key 25) and body (key 1) to indicate
proper alignment.
2. Remove stud nuts (key 26).
Use proper care in moving actuator to
ensure no damage occurs to the pins or
actuator casings.
3. Carefully lift the actuator assembly (keys 11 and 5) off
the body (key 1).
4. Remove O-ring (key 34) from lower actuator casing
(key 5). Inspect the O-ring for damage or wear and
replace if necessary. Lightly lubricate O-ring before
placing on lower actuator casing (key 5).
5. Remove the hex socket cap screws (key 33) and spring
lock washers (key 32). Lift off the disk holder assembly
(key 30) and disk retainer (key 31).

6
Type EZL
6. Remove the O-ring (key 29). Inspect for damage or wear
and replace if necessary. Lightly lubricate O-ring before
placing in the sleeve adaptor (key 27).
7. Remove the O-ring (key 29). Inspect for damage or wear
and replace if necessary. Lightly lubricate O-ring before
placing in the sleeve adaptor (key 27).
7a. On the 2 and 3 in. / DN 50 and 80 sizes remove the seat
ring (key 2), spring washer (key 72) and O-ring (key 34)
(see Figure 4, Detail A.2). Inspect the O-ring for damage
or wear, replace if necessary.
7b. On the 4 in. / DN 100 size remove the intermediate
flange (key 25), seat ring (key 2) and O-ring (key 75)
(see Figure 4, Detail A.2). The seat ring (key 2) can
be moved out of the way and the O-ring (key 75) can
be removed without removing the intermediate flange
(key 25). Inspect the O-ring for damage or wear, replace
if necessary.
8a. For the 2 and 3 in. / DN 50 and 80 sizes reinstall the
spring washer (key 72) with the inside edge pointing up.
Lightly lubricate O-ring (key 34) before placing on top of
the spring washer (key 72) in the body (key 1).
8b. For the 4 in. / DN 100 size lightly lubricate the O-ring
(key 75) and place it in the body (key 1).
9. Set the seat ring (key 2) back in the body (key 1) with
the curved side down and the seat edge up.
10. Place the disk holder assembly (key 30) and disk
retainer (key 31) on the sleeve adaptor (key 27).
11. Insert the spring lock washers (key 32) and hex socket
cap screws (key 33) and tighten. See
Torque Specification table for proper torque.
12. Lubricate surface between lower casing and
intermediate flange. Carefully lift the upper actuator
casing and lower actuator casing assembly (keys 11
and 5) and place on the body (key 1). Secure with
stud nuts (key 26). See Torque Specification table for
proper torque.
Intermediate Flange O-ring Maintenance
1. Make a mark on the lower actuator casing (key 5),
intermediate flange (key 25) and body (key 1) to indicate
proper alignment.
2. Remove stud nuts (key 26).
3. Carefully lift the upper actuator casing and lower
actuator casing assembly (keys 11 and 5) off the
body (key 1).
4. Remove cap screws (key 6).
5. Lift off intermediate flange (key 25).
6. Remove O-ring (key 7). Inspect the O-ring for damage
or wear and replace if necessary. Lightly lubricate O-ring
before placing in the body (key 1).
7. Replace the intermediate flange (key 25), make sure to
position the stud bolt (key 24) holes on the outsides of
the body (key 1). Secure with cap screws (key 6). See
Torque Specification table for proper torque.
8. Lubricate the surface between the lower casing and
the intermediate flange. Reinstall actuator assembly
to body.
Actuator Assembly Maintenance
1. Make a mark on the upper actuator casing (key 11),
lower actuator casing (key 5), intermediate flange
(key 25) and body (key 1) to indicate proper alignment.
2. Remove travel indicator assembly, if present, by
loosening the travel indicator fitting (key 56) and lifting
out the indicator assembly. Refer to Travel Indicator
Maintenance section for maintenance procedure.
3. Remove cap screws (key 21), washers (key 22) and
hex nuts (key 23). Remove all the short cap screws first,
then evenly remove the two long cap screws (key 39)
and brackets (key 35). Take care to balance the upper
actuator casing while removing the spring tension.
Carefully lift the upper actuator casing (key 11) off the
lower actuator casing (key 5). Remove spring (key 13).
4. Remove the hex socket cap screws (key 16). Lift off the
diaphragm (key 20) and the inlet plate (key 18). Remove
O-rings (keys 15 and 17). Inspect the diaphragm and
O-rings for damage or wear and replace if necessary.
5. Inspect the upper actuator casing (key 11), O-ring
(key 9), anti-friction split rings (key 8) and anti-friction
ring (key 4) for damage or wear. If damaged, remove
the O-ring and split rings and replace with new parts.
Lightly lubricate the O-ring and split rings. Place the split
rings in the body first, then slide the O-ring between the
split rings.
6. Remove hex nuts (key 26) from the stud bolts (key 24).
Lift off the lower actuator casing (key 5). Remove the
hex socket cap screws (key 33) and spring lock washers
(key 32). Lift off the disk holder assembly (key 30) and
disk retainer (key 31).
7. Slide the sleeve (key 14) out of the lower actuator
casing (key 5) and slide the outlet plate (key 19) off of
the sleeve. Check the sleeve for scratches, burrs or
other damage and replace if necessary.
8. Inspect the lower actuator casing (key 5), O-ring
(key 9), anti-friction split rings (key 8) and anti-friction
ring (key 4) for damage or wear. If damaged, remove
the O-ring and split rings and replace with new parts.
Lightly lubricate the O-ring and split rings. Place the split
rings in the body first, then slide the O-ring between the
split rings.

7
Type EZL
9. Slide the outlet plate (key 19) onto the sleeve
(key 14) and slide the sleeve into the lower actuator
casing (key 5). Place the disk holder (key 30) and
disk retainer (key 31) on the sleeve adaptor (key 27).
Insert the spring lock washers (key 32) and hex
socket cap screws (key 33) and tighten. See Torque
Specification table for proper torque. If seat was
removed, make sure to reinstall.
10. Lightly lubricate the O-rings (keys 15 and 17) and the
inner and outer diaphragm (key 20) edges. Make sure
O-rings (keys 15 and 17) are correctly positioned. Place
the inlet plate (key 18) and the diaphragm (key 20) on
the sleeve (key 14). Insert and tighten the hex socket
cap screws (key 16). See Torque Specification table for
proper torque.
11. Lubricate surface between lower casing and
intermediate flange. Carefully lift the lower actuator
casing assembly (key 5) and place on the body (key 1).
Take care to match up the alignment marks. Secure
with stud bolts and nuts (keys 24 and 26). See Torque
Specification table for proper torque.
12. Lightly lubricate the spring (key 13) and place on the
inlet plate (key 18).
13. Carefully place the upper actuator casing (key 11) on
the lower actuator casing (key 5). Take care to match
up the alignment marks. Insert the two long cap screws
(key 39) and brackets (key 35) 180° apart and away
from flanges. Place the washers (key 22) and hex nuts
(key 23) on the long cap screws and evenly tighten.
Using proper bolting techniques, install remaining small
cap screws (key 21), washers and hex nuts. See Torque
Specification table for proper torque.
14. Place travel indicator assembly in the upper actuator
casing (key 11), if present and tighten the travel
indicator fitting (key 56).
Type EZL Travel Indicator Maintenance
A new and improved version of the travel indicator has
been phased in during 2013. The new version improves
the O-ring seal to minimize leakage and extend service life.
The components of the legacy and new versions are not
interchangeable. If maintenance is performed on the travel
indicator, it is recommended to replace the entire travel
indicator assembly with the new version. Part numbers for
the assemblies are shown in the parts list. Figure 3 shows
the difference between the designs. The spare parts kits will
support either design. Take care to use the correct O-ring
(key 12A or 12B) when performing maintenance, see parts
list for the appropriate part number.
1. Remove plastic travel indicator cover (key 53).
2. Loosen travel indicator bushing (key 55) and remove it
by sliding it over the travel indicator stem (key 54).
3. Remove indicator fitting (key 56) and inspect O-ring
(key 70). Remove O-ring (key 12B) and back-up rings
(key 76). Replace and lubricate O-ring if damaged. Pull
up on the travel indicator stem (key 54) to force the
spring collet (key 57) out of the diaphragm head groove.
Examine these parts and the stem for wear and replace
if necessary.
4. Insert the travel indicator stem (key 54) and spring collet
(key 57) back into the diaphragm head groove. Replace
the indicator fitting (key 56) and O-ring (key 70) and
tighten with a referenced torque of 20 ft-lbs / 27.1 N•m.
5. Lubricate the O-ring (key 12B) and backup rings
(key 76, 2 required). Place one back-up ring on the stem
(key 54) followed by the O-ring and then the other back-
up ring. Push into groove of the indicator fitting (key 56).
Slide the travel indicator bushing (key 55) over
the travel indicator stem (key 54) and tighten
firmly in place with a torque of 3.7 ft-lbs / 5.0 N•m.
6. Replace the travel indicator cover (key 53) and tighten
firmly in place.
Pilot Maintenance
6358 Series Pilots
Key numbers are referenced in Figures 5 and 6 unless
otherwise noted. Unless replacing or removing the body
assembly (key 1), the pilot may remain on the pipe nipple
(key 47) during maintenance.
Table 3. Torque Specications
BODY SIZE
INDICATOR
FITTING (KEY 56)
OR PLUG (KEY 38),
FT-LBS / N•m
STUD NUTS
(KEY 26),
FT-LBS / N•m
SOCKET HEAD CAP
SCREWS (KEY 16)(1)(2),
FT-LBS / N•m
CAP SCREWS
(KEYS 21 AND 39),
FT-LBS / N•m
CAP SCREWS
(KEY 6),
FT-LBS / N•m
SOCKET HEAD CAP
SCREWS (KEY 33)(1),
FT-LBS / N•m
2 in. / DN 50 10 to 15 / 15 to 20 45 to 50 / 60 to 70 55 to 60 / 75 to 80 35 to 45 / 50 to 60 50 to 60 / 70 to 80 55 to 60 / 75 to 80
3 and 4 in. /
DN 80 and 100
10 to 15 /
15 to 20
80 to 95 /
110 to 130
90 to 100 /
120 to 135
31 to 34 /
42 to 46
70 to 95 /
95 to 130
80 to 90 /
110 to 120
1. Socket head cap screw (keys 16 and 33) torque specications are given in in-lbs.
2. Apply torque to each screw in star pattern, 5 complete rounds.

55 55
53
54
55
56
53
54
55
56
76
70
L1 12B
L1 12A
L1 70 L1
57 S1 57 S1
8
Type EZL
WARNING
!
Avoid personal injury or damage to
property from sudden release of pressure
or uncontrolled gas or other process fluid.
Before starting to disassemble, carefully
release all pressures according to the
shutdown procedure. Use gauges to monitor
inlet, loading and outlet pressures while
releasing these 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).
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).
3. Remove the machine screws (key 17) and separate the
spring case (key 2) from the body assembly. Remove
the control spring seat (key 8), the control spring (key 7)
and, if used, the diaphragm limiter (key 40).
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 6358 Series has a
restriction plug, not a restriction.
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 make sure
to install the connector cap O-ring or gasket (key 36)
between the body (key 1) and the stem guide.
Note
In step 3, if installing a different size
restriction, be sure to remove the code letter
on the bottom of the pilot and indicate the
new letter.
LEGACY TRAVEL INDICATOR DETAIL
TOP VIEW TOP VIEW
IMPROVED TRAVEL INDICATOR DETAIL
P1765
APPLY LUBRICANT (L) OR SEALANT (S)(1)
L1 = LITHIUM HYDROXYSTEGRATE NLGI 2 GRADE GREASE
S1 = ANAEROBIC METHACRYLATE SEALANT FOR NUTS AND BOLTS
1. Lubricant and sealant must be selected such that they meet the temperature requirements.
Figure 3. Travel Indicator Assembly Drawings

9
Type EZL
3. If the restriction or restriction plug (key 20) was
removed, coat the threads with lubricant and install it.
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 with
the connector cap (key 6).
6. Install the diaphragm assembly (key 5) and push down
on it to see if the valve plug (key 4) moves smoothly.
The diaphragm assembly should stroke approximately
1/16 in. / 1.6 mm after the valve plug contacts the port.
Note
In step 7, if installing a control spring of
a different set pressure range, be sure to
remove the set pressure range on the spring
case and indicate the new range.
7. Stack the control spring (key 7), the control spring seat
(key 8) and, if used, the diaphragm limiter (key 40) onto
the diaphragm assembly (key 5). Make sure to install
the diaphragm limiter bevelled side up.
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 ft-lbs / 7 to 9 N•m of torque.
9. Replace the closing cap gasket (key 19) if necessary
install the closing cap (key 12). When all maintenance
is complete, refer to the Startup and Shutdown section
to put the relief valve or backpressure regulator into
operation and adjust the pressure setting.
Parts Ordering
Each Type EZL relief valve or backpressure regulator
is assigned a serial number, which can be found on the
nameplate. Refer to the number when contacting your local
Sales Office for technical information or ordering parts. Also
be sure to include the complete 11-character part number
from the following Parts List.
Parts List
Type EZL Main Valve (Figure 4)
Key Description Part Number
Disk Parts Kits
2 and 3 in. / DN 50 and 80 (includes key numbers: 29, 30 and 34)
4 in. / DN 100 (includes key numbers: 29, 30, 34 and 75)
2 in. / DN 50, Nitrile (NBR) and
Fluorocarbon (FKM) REZL2X00N12
Key Description Part Number
Disk Parts Kits (continued)
2 in. / DN 50, Fluorocarbon (FKM) REZL2X00F12
3 in. / DN 80, Nitrile (NBR) and
Fluorocarbon (FKM) REZL3X00N12
3 in. / DN 80, Fluorocarbon (FKM) REZL3X00F12
4 in. / DN 100, Nitrile (NBR) and
Fluorocarbon (FKM) REZL4X00N12
4 in. / DN 100, Fluorocarbon (FKM) REZL4X00F12
Full Repair Kits
2 and 3 in. / DN 50 and 80 (includes key numbers:
4, 7, 8, 9, 12B, 15, 17, 20, 28, 29, 30, 34, 70 and 76)
4 in. / DN 100 (includes key numbers:
4, 7, 8, 9, 12B, 15, 17, 20, 28, 29, 30, 34, 70, 75 and 76)
2 in. / DN 50, Nitrile (NBR) and
Fluorocarbon (FKM) REZL2X00N22
2 in. / DN 50, Fluorocarbon (FKM) REZL2X00F22
3 in. / DN 80, Nitrile (NBR) and
Fluorocarbon (FKM) REZL3X00N22
3 in. / DN 80, Fluorocarbon (FKM) REZL3X00F22
4 in. / DN 100, Nitrile (NBR) and
Fluorocarbon (FKM) REZL4X00N22
4 in. / DN 100, Fluorocarbon (FKM) REZL4X00F22
Travel Indicator Parts Kits
2 in. / DN 50 (includes key numbers:
12B, 53, 54, 55, 56, 57, 58, 70 and 76) ERSA01550A0
3 and 4 in. / DN 80 and 100 (includes
key numbers: 12B, 53, 54, 55, 56,
57, 58, 70 and 76) ERSA01555A0
1 Body
2 in. / DN 50
Cast iron
NPT GE10583X012
CL125 FF GE10585X012
Steel
NPT GE10588X012
CL150 RF
Standard GE10676X032
Tapped inlet and outlet 14B5834X032
CL300 RF
Standard GE10676X012
Tapped inlet and outlet 14B5834X042
CL600 RF
Standard GE10679X012
Tapped inlet and outlet 14B5834X052
BWE, Schedule 40 GE10680X012
SWE GE10682X012
3 in. / DN 80
Cast iron
CL125 FF GE10689X012
Steel
CL150 RF
Standard GE10699X012
Tapped inlet and outlet 14B5835X032
CL300 RF
Standard GE10700X012
Tapped inlet and outlet 14B5835X042
CL600 RF
Standard GE10701X012
Tapped inlet and outlet 14B5835X052
BWE, Schedule 40 GE10702X012
- continued -

10
Type EZL
Type EZL Main Valve (Figure 4) (continued)
Key Description Part Number
1 Body (continued)
4 in. / DN 100
Cast iron
CL125 FF GE10707X012
Steel
CL150 RF
Standard GE10835X012
Tapped inlet and outlet 14B5836X032
CL300 RF
Standard GE10839X012
Tapped inlet and outlet 14B5836X042
CL600 RF
Standard GE10842X012
Tapped inlet and outlet 14B5836X052
BWE, Schedule 40 GE10843X012
2 Seat Ring
2 in. / DN 50 GE10271X012
3 in. / DN 80 GE11213X012
4 in. / DN 100 GE17779X012
3* Pin
2 in. / DN 50 (6 required) M0295820X12
3 and 4 in. / DN 80 and 100 (8 required) M0297310X12
4* Anti-Friction Ring (2 required)
2 in. / DN 50 M0272760X12
3 and 4 in. / DN 80 and 100 M0272810X12
5 Actuator Lower Casing
2 in. / DN 50 GE05003X012
3 and 4 in. / DN 80 and 100 GE07988X012
6 Cap Screws (8 required)
2 in. / DN 50 1A340924052
3 and 4 in. / DN 80 and 100 M4696002X12
4 in. / DN 100 1N462324052
7* O-ring
2 in. / DN 50
Nitrile (NBR) 12A1297X022
Fluorocarbon (FKM) 12A1297X012
3 in. / DN 80
Nitrile (NBR) 18B8514X012
Fluorocarbon (FKM) 18B8514X022
4 in. / DN 100
Nitrile (NBR) 18B2140X012
Fluorocarbon (FKM) 18B2140X022
8* Anti-Friction Rings (4 required)
2 in. / DN 50 M0194690X12
3 and 4 in. / DN 80 and 100 M0192170X12
9* O-ring (2 required)
2 in. / DN 50
Nitrile (NBR), -20 to 180°F / -29 to 82°C 1C3342X0042
Fluorocarbon (FKM) M6020036X12
3 and 4 in. / DN 80 and 100
Nitrile (NBR), -20 to 180°F / -29 to 82°C 1D2658X0012
Fluorocarbon (FKM) 1D2658X0022
10 Pipe Plug (up to 3 required), All sizes 1A767524662
11 Actuator Upper Casing
2 in. / DN 50 GE04968X012
3 and 4 in. / DN 80 and 100 GE07514X012
12A* O-ring
Nitrile (NBR) M6010001X12
Fluorocarbon (FKM) M6020066X12
12B* O-ring
Nitrile (NBR) 1H2926X0032
Fluorocarbon (FKM) 1H2926X0022
13 Spring
2 in. / DN 50 M0195000X12
3 and 4 in. / DN 80 and 100 M0196880X12
14 Sleeve
2 in. / DN 50 M0272600X12
3 and 4 in. / DN 80 and 100 M0276310X12
Key Description Part Number
15* O-ring
2 in. / DN 50 M6020095X12
3 and 4 in. / DN 80 and 100 M6020073X12
16 Socket Head Cap Screw (6 required)
2 in. / DN 50 M5011119X12
3 and 4 in. / DN 80 and 100 FA402512X12
17* O-ring
2 in. / DN 50 M6020096X12
3 and 4 in. / DN 80 and 100 M6020127X12
18 Inlet Plate
2 in. / DN 50 M0300260X12
3 and 4 in. / DN 80 and 100 M0196800X12
19 Outlet Plate
2 in. / DN 50 M0279180X12
3 and 4 in. / DN 80 and 100 M0276570X12
20* Diaphragm
2 in. / DN 50 GE07400X012
3 and 4 in. / DN 80 and 100 GE09204X012
21 Cap Screw
2 in. / DN 50 (14 required) 18B3065X012
3 and 4 in. / DN 80 and 100 (22 required) 1A514724052
22 Plain Washer
2 in. / DN 50 (32 required) 1A5196X0012
3 and 4 in. / DN 80 and 100 (48 required) 1A518925072
23 Hex Nut
2 in. / DN 50 (16 required) 1E944624112
3 and 4 in. / DN 80 and 100 (24 required) 1A3412A0022
24 Continuous Thread Stud Bolt (4 required)
2 in. / DN 50 GE00808X012
3 and 4 in. / DN 80 and 100 M4693003X12
25 Intermediate Flange
2 in. / DN 50 GE10308X012
3 in. / DN 80 GE11210X012
4 in. / DN 100 GE17777X012
26 Hex Nut (4 required)
2 in. / DN 50 1A341224122
3 and 4 in. / DN 80 and 100 1A368124122
27 Sleeve Adaptor
2 in. / DN 50 M0272570X12
3 and 4 in. / DN 80 and 100 GD27634X012
28* O-ring
2 in. / DN 50 M6020079X12
3 and 4 in. / DN 80 and 100 M6020151X12
29* O-ring
2 in. / DN 50 M6020112X12
3 and 4 in. / DN 80 and 100 M6020005X12
30* Disk Holder Assembly
2 in. / DN 50
Nitrile (NBR) M0279110X12
Fluorocarbon (FKM) M0281870X12
3 and 4 in. / DN 80 and 100
Nitrile (NBR) M0276830X12
Fluorocarbon (FKM) M0282120X12
31 Disk Retainer
2 in. / DN 50
100% Capacity M0272750X12
80% Capacity M0297340X12
50% Capacity M0297430X12
30% Capacity M0297440X12
31 Disk Retainer (continued)
3 and 4 in. / DN 80 and 100
100% Capacity M0276250X12
80% Capacity M0297630X12
50% Capacity M0297640X12
30% Capacity M0297650X12
32 Lock Washer (2 required)
2 in. / DN 50 M5077004X12
3 and 4 in. / DN 80 and 100 M5077001X12
*Recommended spare part - continued -

11
Type EZL
Type EZL Main Valve (Figure 4) (continued)
Key Description Part Number
33 Socket Head Cap Screw (2 required)
2 in. / DN 50 M5011006X12
3 and 4 in. / DN 80 and 100 M5011017X12
34* O-ring (2 required)
2 in. / DN 50
Nitrile (NBR) 10B4428X012
Fluorocarbon (FKM) 10B4428X022
3 and 4 in. / DN 80 and 100
Nitrile (NBR) 10B4366X012
Fluorocarbon (FKM) 10B4366X022
35 Bracket (2 required)
2 in. / DN 50 M0278570X12
3 and 4 in. / DN 80 and 100 M0220960X12
36 Nameplate - - - - - - - - - - -
37 Drive Screw (5 required), All sizes 1A368228982
38 Travel Indicator Plug, All sizes M0297680X12
39 Bolt (2 required)
2 in. / DN 50 GE07223X012
3 and 4 in. / DN 80 and 100 GE07221X012
43 Caution Label (2 required) GE00835X012
44 Adjusting Screw Cap, All sizes 24B1301X012
53 Indicator Cover
2 in. / DN 50 M0196770X12
3 and 4 in. / DN 80 and 100 M0192220X12
54 Travel Indicator Stem
2 in. / DN 50 ERSA01799A0
3 and 4 in. / DN 80 and 100 ERSA01806A0
55 Indicator Bushing, All sizes ERSA02798A0
56 Travel Indicator Fitting, All sizes ERSA02569A0
57 Spring Collet, All sizes M0192180X12
58 Travel Indicator Scale, All sizes M0201990X12
59 Flow Arrow, All sizes - - - - - - - - - - -
60 Protective Cap
2 in. / DN 50 T13659T0112
3 in. / DN 80 T13659T0092
70* O-ring M6020005X12
72 Belleville Washer
2 in. / DN 50 GE10273X012
3 and 4 in. / DN 80 and 100 GE11214X012
75* O-ring
4 in. / DN 100
Nitrile (NBR) 10B4373X012
Fluorocarbon (FKM) 10B4373X022
76* Back Up Ring (2 required) 1N659106242
Mounting Parts
Type 6358
Key Description Part Number
47 Pipe Nipple 1F730226012
48 Tube Elbow - - - - - - - - - - -
49 External Tube Connector - - - - - - - - - - -
52 Tubing - - - - - - - - - - -
61 Coupling 1H724028992
62 Bushing 1C379026232
63 1/4 in. / 6.35 mm, Pipe Nipple 1C488226232
64 1/4 in. / 6.35 mm, Coupling 1C911728992
6358 Series Pilot (Figures 5 and 6)
Key Description Part Number
Parts Kit (included are keys 4, 5, 13, 14, 19,
36, 37 and P590 Series Filter, keys 2 and 7)
Type 6358 Parts Kit R6358X00012
1 Body
Aluminum (NACE) (only available for
Types 6358 and 6358B) 39A0138x012
Stainless steel (NACE) 39A5972x012
2 Spring Case
Types 6358 and 6358B
Aluminum 25A6220x012
Stainless steel 28A9277x012
Types 6358EB and 6358EBH
Stainless steel 27B9722x012
3 Body Plug
Aluminum (NACE) 1B797509032
Stainless steel 1B7975x0052
Stainless steel (NACE) 1B797535072
4* Valve Plug Assembly, Stainless steel plug with
Types 6358 and 6358B
Nitrile (NBR) plug 14B6372x012
Fluorocarbon (FKM) plug 16A2924x012
Types 6358EB and 6358EBH
Nitrile (NBR) plug 18B3427x012
Fluorocarbon (FKM) plug 18B3427x022
5* Diaphragm Assembly
Types 6358 and 6358B
Nitrile (NBR) 15A6216X072
Nitrile (NBR) (NACE) 15A6216X212
Fluorocarbon (FKM) 15A6216X172
Type 6358EB
Nitrile (NBR)
75 to 200 psig / 5.17 to 13.8 bar 18B3428X012
180 to 350 psig / 12.4 to 24.1 bar 18B3428X022
Fluorocarbon (FKM)
75 to 200 psig / 5.17 to 13.8 bar 18B3428X042
180 to 350 psig / 12.4 to 24.1 bar 18B3428X052
Type 6358EBH
Nitrile (NBR) 18B3429X012
Fluorocarbon (FKM) 18B3429X022
6 Connector Cap, Stainless steel
Types 6358 and 6358B
Standard 16A2921X012
NACE 16A2921X022
Type 6358EB or 6358EBH
Standard 14B9813X012
NACE 14B9813X022
7 Control Spring
Type 6358
10 to 40 psig / 0.69 to 2.76 bar, Yellow 1E392527022
35 to 125 psig / 2.41 to 8.62 bar, Red 1K748527202
Type 6358B
10 to 30 psig / 0.69 to 2.07 bar, Silver 1B788327022
30 to 60 psig / 2.07 to 4.14 bar, Blue 1B788427022
60 to 125 psig / 4.14 to 8.62 bar, Red 1K748527202
Type 6358EB
85 to 140 psig / 5.86 to 9.65 bar, Green 17B1261X012
130 to 200 psig / 8.96 to 13.8 bar, Blue 17B1263X012
180 to 350 psig / 12.4 to 24.1 bar, Red 17B1264X012
Type 6358EBH
250 to 400 psig / 17.2 to 27.6 bar, Blue 17B1263X012
*Recommended spare part - continued -

12
Type EZL
6358 Series Pilot
(Figures 5 and 6) (continued)
Key Description Part Number
8 Spring Seat, Zinc-plated steel
Types 6358 and 6358B 1B798525062
Type 6358EB or 6358EBH 17B0515X012
9 Stem Guide
Stainless steel 16A2923X012
Stainless steel (NACE) 16A2923X022
10 Adjusting Screw
Types 6358 and 6358B 10B7192X012
Type 6358EB
75 to 140 psig / 5.17 to 9.65 bar 17B1227X012
130 to 200 psig / 8.96 to 13.8 bar 10B3081X012
180 to 350 psig / 12.4 to 24.1 bar 10B3080X012
Type 6358EBH 10B3080X012
11 Locknut
Types 6358 and 6358B 1A946324122
Type 6358EB or 6358EBH 1D667728982
12 Closing Cap
Types 6358 and 6358B
Aluminum 23B9152X012
Aluminum (NACE) 1H2369X0012
Stainless steel (NACE) 1H2369X0032
Types 6358EB and 6358EBH
Stainless steel (NACE) 24B1301X012
13* Body Plug O-ring, Nitrile (NBR) (for use with
Stainless steel bodies)
Nitrile (NBR) 1F113906992
Fluorocarbon (FKM) 1N463906382
13* Body Plug Gasket (for use with aluminum bodies
on Types 6358 and 6358B only) 1C495704022
14 Valve Plug Spring
Types 6358, 6358EB and 6358EBH
Standard 1E701337022
Stainless steel (NACE) 19A8179X012
Type 6358B
Stainless steel 17A2328X012
Stainless steel (NACE) 19A8179X012
15 O-ring (for Type 6358EB only) 10A7777X012
16 Vent Assembly, Type Y602X1-A12 (2 required) 27A5515X012
17 Machine Screw (6 required)
Type 6358EB
Aluminum 1V4360X0022
Stainless Steel 1V4360X0112
Type 6358EBH T12980T0012
18 Connector Cap O-ring
(for Types 6358EB and 6358EBH)
Nitrile (NBR) 10A0904X012
Fluorocarbon (FKM) 10A0904X032
19* Closing Cap Gasket (for use with stainless
steel Types 6358 and 6358B) 15A6218X012
20 Restriction Plug (for Type 6358 only)
Standard 1A346128982
NACE 1V7435X0012
20 Restriction
Type 6358B
High Gain 17A7279X012
Medium Gain 17A2029X012
Low Gain 17A7277X012
Types 6358EB and 6358EBH
High Gain
Standard 17A7279X012
Low Gain
Standard 17A2030X012
36* Connector Cap O-ring or Gasket (2 required)
Fluorocarbon (FKM) 1U1716X0012
6358 Series Pilot
(Figures 5 and 6) (continued)
Key Description Part Number
37 Stem O-ring
Nitrile (NBR) 16A2920X012
Fluorocarbon (FKM) 16A2920X022
38 Lower Spring Seat, thermoplastic
Types 6358EB and 6358EBH 18B1248X012
40 Diaphragm Limiter for Type 6358EB at
180 to 350 psig / 12.4 to 24.1 bar 10B4407X012
42 NACE Tag - - - - - - - - - - -
43 Tag Wire - - - - - - - - - - -
P590 Series Filter (Figure 7)
Key Description Part Number
1 Filter Body
Type P594-1, Brass 1E312414012
Type P593-1, Aluminum 1E312409012
2* Filter Element, Cellulose 1E312606992
3 Filter Head
Type P594-1, Brass 1E312514012
Type P593-1, Aluminum 1E312509012
4 Machine Screw
Type P594-1, Brass 1J500218992
Type P593-1, Aluminum 1J500209012
5 Washer (2 required)
Type P594-1, Brass 1J500018992
Type P593-1, Aluminum 1J500010062
6 Spring Washer, Plated carbon steel 1H885128982
7* Gasket, Composition 1F826804022
Type 252 Pilot Supply Filter (Figure 8)
Key Description Part Number
1 Filter Head Assembly
Aluminum (A92011 T3) 17B7978X012
316 Stainless steel 17B7978X022
2 Filter Body
Aluminum (A92011 T3)
Standard 27B6811X022
Extended 27B7488X022
316 Stainless steel
Standard 27B6811X012
Extended 27B7488X012
3 Lower Seat, Delrin®17B6816X012
4 Filter Cartridge, Polyethylene 17B6813X012
5 O-ring, Nitrile (NBR) 1F269206992
6 Pipe Plug, 316 Stainless steel 1A767535072
7 Drain Valve (Optional),
316 Stainless steel 16A8280X362
8 Upper Seat, Delrin®17B6814X012
*Recommended spare part
Delrin®is a mark owned by E.I. du Pont de Nemours and Co.

A
2
1
72
22
23
24
25
34
26
6
27
28
29
30
31
32
33
34
32
33
21
20
1918
17
16
15
891084
1413
3
4
5
6
7
8
9
8
11
L1
L1 L1 L1 S3 L1 L1 L1 S1 L1 L1
L1
L1
L1
L1
L1
L1
S1
S1
L1
L1
L1
L1
L1
L1
S2
S1
S1
75
2
2
L1
34
72
L1
13
Type EZL
DETAIL A.1
4 IN. / DN 100 BODY SIZE ONLY
DETAIL A.2
2 AND 3 IN. / DN 50 AND 80
BODY SIZES ONLY
APPLY LUBRICANT (L) OR SEALANT (S)(1)
L1 = LITHIUM HYDROXYSTEGRATE NLGI 2 GRADE GREASE
S1 = ANAEROBIC METHACRYLATE SEALANT FOR NUTS AND BOLTS
S2 = ANAEROBIC METHACRYLATE SEALANT FOR THREADS
S3 = MULTI-PURPOSE POLYTETRAFLUOROETHYLENE (PTFE) THREAD SEALANT
1. Lubricant and sealants must be selected such that they meet the temperature requirements.
Figure 4. Type EZL Main Valve Assembly
GE10987

37
36
43
39
60
3759
35
10
19
8
6
5
14
9
37
S
313
1
4
20
16
36
7
2
11
S
12
14
Type EZL
GE10987-8
B2619-2_6365
Figure 4. Type EZL Main Valve Assembly (continued)
Figure 5. Types 6358B Pilot Assembly
APPLY SEALANT (S)
TYPE 6358B PILOT INTERIOR VIEW

10 12
11
S
14
20
16
13
2
6
4
1
18
38
8
7
5
9
3
36
37
16
S
S
40
15
Type EZL
48B4849_A
48B3430_A
APPLY SEALANT (S)
TYPE 6358EB PILOT INTERIOR VIEW
TYPE 6358EB PILOT WITH DIAPHRAGM LIMITER
FOR 180 TO 350 psig / 12.4 TO 24.1 bar
SET PRESSURE RANGE INTERIOR VIEW
Figure 6. Types 6358EB Pilot Assembly

6 5 2 5
7 1 4 3
7
3 4 5
1826
Type EZL
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D104251X012 © 2017, 2019 Emerson Process Management Regulator
Technologies, Inc. All rights reserved. 08/19.
The Emerson logo is a trademark and service mark of Emerson Electric
Co. All other marks are the property of their prospective owners.
Fisher™ is a mark owned by Fisher Controls International LLC, a business
of Emerson Automation Solutions.
The contents of this publication are presented for informational purposes
only, and while every e󰀨ort 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. All sales are governed by our terms and conditions, which
are available upon request. We reserve the right to modify or improve the
designs or specications of such products at any time without notice.
Emerson Process Management Regulator Technologies, Inc does not
assume responsibility for the selection, use or maintenance of any
product. Responsibility for proper selection, use and maintenance of any
Emerson Process Management Regulator Technologies, Inc. product
remains solely with the purchaser.
Figure 8. Type 252 Filter
A7013
EXTENDED BODY
STANDARD BODY
OPTIONAL DRAIN VALVE
Figure 7. P590 Series Filter
A7008