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Upper Case Maintenance
1. Disconnect pilot and remove it from the line.
2. Loosen locknut (key 2) and backout adjusting screw
(key 1) until compression is removed from the spring.
Remove cap (key 3).
3. Lift the spring carrier (key 6) the spring (key 7) and
O-ring (key 4) out of the upper cover (key 8). Inspect
the O-ring and replace if necessary.
4. Remove screws (key 10) from lower cover (key 21) and
separate lower cover from the body (key 16), unless
removed during lower diaphragm maintenance. Use a
wrench to hold stem (key 19) securely while removing
the stem nut (key 26).
5. Remove remaining loose components: washer, upper
diaphragm plate, diaphragm, lower diaphragm plate
and O-rings (keys 11, 13, 14, 15, 18 and 25). Inspect
diaphragm and O-rings for damage or wear and
replace if necessary.
6. Lightly lubricate the O-ring (key 25). Place the O-ring
over the stem (key 19) and press it down into the body
(key 16).
7. Set the lower diaphragm plate (key 15) into the body
(key 16).
8. Lightly lubricate the rims of the diaphragm (key 14)
and place it in the body (key 16) on top of the lower
diaphragm plate (key 15).
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. Set the spring carrier (key 6).
Damper and Restrictor Maintenance
1. Remove the screw (key 31) and plate (key 29).
2. Remove bolts (key 30).
3. Remove the damper adjusting screw (key 27). Remove
and inspect O-ring (key 28) for damage or wear and
replace if necessary. Lightly lubricate O-ring before
placing on the adjusting screw. Insert damper adjusting
screw into the body (key 16) and tighten. Insert ring nut
(key 30) and tighten. Back out damper adjusting screw
until it stops.
Types EZH and EZHSO
4. Remove restrictor adjusting screw with hole (key 32).
Remove and inspect O-ring (key 28) for damage
or wear and replace if necessary. Lightly lubricate
O-ring before placing on the adjusting screw. Insert
restrictor adjusting screw into the body (key 16)
and completely tighten. Insert ring nut (key 30) and
completely tighten. Back out restrictor adjusting screw
1/2 turn.
When using a Type PRX/120 pilot with
a Type PRX/125 pilot as monitor, follow
these steps:
•
Restrictor: completely tighten and then
back out three full turns,
•
Damper: back out until it stops.
5. Install plate (key 29) and screw (key 31).
Note
25
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