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Types EZH and EZHSO
18. Lubricate threads on bolts (key 21).
19. Bolt together the upper and lower actuator casings
using bolts (key 21), washers (key 22) and nuts
(key 23). See Torque Specification table for
proper torque.
20. Mount O-ring (key 75) on the cap (key 70).
For EZHSO Series: Place the washer (key 193) on the
stem (key 147). Assemble one nut (key 151) to the stem
(key 147) until the specified torque is achieved and then
assemble another nut (key 151) to lock the position of
stem. Screw on the closing cap (key 146).
21. Screw the eye-bolts (key 35) on the cap (key 70).
22. Place travel indicator assembly (keys 138, 139, 140,
141, 142, 143, 144, 145 and 192) in the upper actuator
casing (key 11), if present and tighten the travel
indicator fitting (key 141).
Type EZH OS2 Regulator with
Slam-shut Maintenance (Figure 22)
1. Unscrew the BMS (safety manometric box) impulse
line connector.
2. Remove cover (key 57) from the mechanism box (BM).
3. Unscrew fastening screw (key 51).
4. Remove holding pin.
5. Remove mechanism box.
6. Unscrew screws (key 50) from the connecting part
(key 48).
7. Remove connecting part (key 48), O-rings (keys 56 and
49) and if necessary the two guide rings (key 54).
8. Remove spring (key 55) and valve plug (key 46).
9. Unscrew bypass (key 53) and remove valve O-ring.
10. Removing the seat (key 52) (not recommended) from
the body (key 47) requires a special extraction tool.
Type PRX Pilot Maintenance (Figure 25)
CAUTION
!
Always remove spring (key 7) tension before
performing maintenance on this unit.
To remove spring tension loosen locknut
(key 2) and backout adjusting screw
(key 1) until compression is removed from
the spring.
24
Lower Case Maintenance
1. Disconnect pilot and remove it from the line.
2. Remove screws (key 10) from lower cover (key 21)
and the separate lower cover from the body (key 16).
3. Use a wrench to hold the stem (key 23) and break
loose the stem nut (key 20). Remove the stem nut and
washer (key 11).
4. Remove the diaphragm plate (key 13), diaphragm
(key 14), pad holder (key 22) and O-ring (key 18).
Inspect parts for damage or wear, replace if necessary.
5. 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.
6. Set the pad holder (key 22) in the body (key 16).
7. Lightly lubricate the rims of the diaphragm (key 14)
and place it on top of the pad holder (key 22). Set the
diaphragm plate (key 13) on the diaphragm (key 14).
8. Lightly lubricate the O-ring (key 18) and place it in the
lower case (key 21).
9. Place the washer (key 11) and stem nut (key 20) on
the stem (key 23) and tighten.
If also performing upper case maintenance, skip to
step 2 of "Upper Case Maintenance" section.
10. Insert screws (key 10) in the lower cover (key 21)
and tighten uniformly to ensure proper seal.
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