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Type EZH Relief
Upper Diaphragm Maintenance
1. Disconnect pilot and remove it from the line.
2. Loosen locknut (key 2) and back out adjusting screw
(key 1) until compression is removed from the spring.
Remove cap (key 3).
3. Lift the upper spring seat (key 6), spring (key 7) and O-ring
(key 4) out of the spring case (key 8). Inspect O-ring and
replace if necessary.
4. Remove the machine screws (key 10) and the washers
(key 11), separate the spring case (key 8) from the body
(key 16) and lift the lower spring seat (key 9) away from
upper diaphragm nut (key 26). Use a wrench to hold stem
(key 23) securely while removing the upper diaphragm nut.
5. Remove remaining loose components: washer (key 11),
upper diaphragm plate (key 13), diaphragm (key 14), disk
holder (key 22) and O-ring (key 18). Inspect diaphragm
and O-ring for damage or wear and replace if necessary.
6. Remove orifice (key 19) and O-ring (key 17). Inspect the
parts for damage or wear and replace if necessary. Lightly
lubricate the O-ring and place in the body (key 16). Install
the orifice.
7. Set the disk holder (key 22) in the body (key 16).
8. Lightly lubricate the rims of the diaphragm plate (key 14).
Position the diaphragm convolution facing down, make sure
that the diaphragm is not deformed and is properly installed.
Take the diaphragm (key 14) and place it in the body (key 16)
on top of the disk holder (key 22).
9. Set the upper diaphragm plate (key 13) on top of the
diaphragm (key 14).
10. Place washer (key 11) and stem nut (key 26) on the stem
(key 23) and tighten using a wrench to hold the stem.
11. Place the upper spring seat (key 9) on the upper
diaphragm nut (key 26) and mount the spring case (key 8)
on top of the body (key 24) and the diaphragm (key 14).
12. Place washers (key 11) and uniformly tighten the machine
screws (key 10) to hold the body (key 24) and spring case
(key 8) together.
13. Install spring (key 7) and upper spring seat (key 6) on top
of the lower spring seat (key 9) inside the spring case
(key 8). Install Cap (key 3).
14. Screw in adjusting screw (key 1) at desired spring
compression and use the lock nut (key 2) to lock the
adjusting screws position.
Parts Ordering
Each Type EZH relief valve or backpressure regulator
is assigned a serial number, which can be found on the
nameplate. Refer to the serial number when contacting
your local Sales Office for technical information or when
ordering parts.
10
When ordering replacement parts, reference the key
number of each needed part as found in the following parts
list. Separate kit containing all recommended spare parts
is available.
Parts Lists
Type EZH Main Valve (Figure 4)
Key
Description
Disk Parts Kits
NPS 1, 2 and 3 / DN 25, 50 and 80 Bodies
(include keys 29, 30, 32, 33, 34 and 62)
NPS 4, 6, 8 and 12 x 6 / DN 100, DN 150, 200 and
300 x 150 (include keys 29, 30, 32, 33, 69, 71 and 75)
NPS 1 / DN 25 Body
Nitrile (NBR) and Fluorocarbon (FKM)
Fluorocarbon (FKM)
Polyurethane (PU)
NPS 2 / DN 50 Body
Nitrile (NBR) and Fluorocarbon (FKM)
Fluorocarbon (FKM)
Polyurethane (PU)
NPS 3 / DN 80 Body
Nitrile (NBR) and Fluorocarbon (FKM)
Fluorocarbon (FKM)
Polyurethane (PU)
NPS 4 / DN 100 Body
Nitrile (NBR) and Fluorocarbon (FKM)
Fluorocarbon (FKM)
Polyurethane (PU)
NPS 6, 8 and 12 x 6 / DN 150, 200 and
300 x 150 Bodies
Nitrile (NBR)
Fluorocarbon (FKM)
Polyurethane (PU)
Full Repair Kits
NPS 1, 2 and 3 / DN 25, 50 and 80 Bodies
(include keys 4, 7, 8, 9, 15, 17, 20, 28,
29, 30, 32, 33, 34, 62, 142B and 143)
NPS 4 / DN 100 Body (include keys 7, 8,
9, 15, 17, 20, 29, 30, 32, 33, 34, 63, 64,
67, 69, 71, 75, 142B and 143)
NPS 6, 8 and 12 x 6 / DN 150, 200 and 300 x 150
(include keys 7, 8, 9, 15, 17, 20, 29, 30, 32, 33,
34, 64, 69, 71, 75, 142, 143, 160 and 198)
NPS 1 / DN 25 Body
Nitrile (NBR) and Fluorocarbon (FKM)
Fluorocarbon (FKM)
Polyurethane (PU)
NPS 2 / DN 50 Body
Nitrile (NBR) and Fluorocarbon (FKM)
Fluorocarbon (FKM)
Polyurethane (PU)
NPS 3 / DN 80 Body
Nitrile (NBR) and Fluorocarbon (FKM)
Fluorocarbon (FKM)
Polyurethane (PU)
NPS 4 / DN 100 Body
Nitrile (NBR) and Fluorocarbon (FKM)
Fluorocarbon (FKM)
Polyurethane (PU)
NPS 6 and 12 x 6 / DN 150 and
300 x 150 Bodies
Nitrile (NBR)
Fluorocarbon (FKM)
Polyurethane (PU)
NPS 8 / DN 200 Body
Nitrile (NBR)
Fluorocarbon (FKM
Polyurethane (PU)
Part number
REZH1X00N12
REZH1X00F12
REZH1X00P12
REZH2X00N12
REZH2X00F12
REZH2X00P12
REZH3X00N12
REZH3X00F12
REZH3X00P12
REZH4X00N12
REZH4X00F12
REZH4X00P12
REZH6X00N12
REZH6X00F12
REZH6X00P12
REZH1X00N22
REZH1X00F22
REZH1X00P22
REZH2X00N22
REZH2X00F22
REZH2X00P22
REZH3X00N22
REZH3X00F22
REZH3X00P22
REZH4X00N22
REZH4X00F22
REZH4X00P22
REZH6X00N22
REZH6X00F22
REZH6X00P22
REZH8X00N22
REZH8X00F22
REZH8X00P22
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