Emerson Fisher EZH Series Instruction Manual page 11

S2 S2
L2
70 73 72 69
77 74
75
29
32 31 30
3. Unscrew 8 special screws (key 68). Unscrew eye bolts
L2
(key 35) from the cap and unscrew 8 screws (key 77)
to remove cap (key 70) from the upper actuator casing
(key 5). Attach eye bolts to the upper spring seat
(key 73) and lift up and remove the sleeve assembly
(key 14). Lift off the diaphragm/plates system. Remove
O-ring (key 15) and replace it as needed. Inspect
diaphragm for damage or wear; remove screws
(key 16), lift off inlet plate (key 18) to replace diaphragm
(key 20) and O-ring (key 17).
4. Align screw holes on the cap (key 70) to the sleeve
guide screw (key 66). Remove sleeve guide (key 61)
utilizing cap (key 70) to unscrew. Inspect O-rings
(keys 9 and 64) for damage or wear, replace anti-
friction ring (key 8) and O-ring (key 9) if necessary.
Unscrew 8 cap screws (key 6) and remove crush
washers (key 67). Lift off lower casing (key 5).
Inspect O-ring (keys 7 and 63) for damage or wear.
Replace if necessary.
5. Remove cage (key 78).
6. Remove seat ring (key 2). Inspect seat ring for damage or
wear. If damaged, replace with new parts.
7. Remove O-ring (key 34) from body. Inspect for damage or
wear. If damaged, replace with new parts.
8. Lubricate O-ring (key 34) and replace into the body.
9. Place seat ring (key 2) on top of O-ring (key 34) in body
with the curved side down and seat edge up.
Type EZH Relief or Backpressure Regulator
L2
15 16
17 L2
18
43
19
20
L1
21
10
22
23
8
L2
9 L2
L2
8
8
L2
9 L2
8 L2
27
S1
MLM1945_B
78
Figure 4. Type EZH Main Valve Assembly (continued)
36
37
59 37
NPS 4 / DN 100
10. Place cage (key 78) on the top of seat ring (key 2).
11. Place lower casing (key 5) on top of the body. Replace
washer (key 67) and tighten cap screws (key 6).
Screw sleeve guide (key 61) into lower casing (key 5)
utilizing cap (key 70).
12. Lubricate the sleeve (key 14) in the upper plate contact
area and assemble the diaphragm/plates system on
the sleeve system. Tighten screws (key 16) using
a "star" criss-cross pattern for five times until proper
specified torque is achieved.
13. Screw the special screws (key 68) – already on the
sleeve – to fix the diaphragm/plates system on the
sleeve system. See Torque Specifications (Table 3)
for proper torque values. Tighten screws (key 68)
using a "star" criss-cross pattern for five times until
proper specified torque is achieved.
14. Lubricate lower casing (key 5) on the diaphragm
contact area.
15. Carefully insert the trim system into the sleeve guide
(key 61) utilizing the eye-bolts (key 35)
that fits in the upper spring seat (key 73)
threaded hole.
16. Lubricate the diaphragm (key 20) on the upper casing
contact area.
11