4. Remove machine screws (key 10) from lower cover
(key 21) and the separate lower cover from the body
(key 16), unless removed during lower diaphragm
maintenance. Use a wrench to hold stem (key 23)
securely while removing the upper diahragm nut
(key 26).
5. Remove remaining loose components: washer
(key 11), upper diaphragm plate (key 13),
diaphragm (key 14), lower diaphragm plate
(key 15) and O-rings (keys 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 O-ring
over the stem (key 23) 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 upper diaphragm nut
(key 26) on the stem (key 23) and tighten using a
wrench to hold the stem.
11. Set the upper spring seat (key 6).
Damper and Restrictor Maintenance
1. Remove screw (key 31, Figure 26) and plate (key 29).
2. Remove ring nuts (key 30).
3. Remove 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.
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.
Note
When using a Type PRX/120 pilot with a
Type PRX/125 pilot as a monitor, use the
following settings:
• 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).
Type 112 Restrictor
Perform this procedure only if O-rings are leaking.
Key numbers are referenced in Figure 21.
1. Unscrew the groove valve (key 22) and retainer
(key 23) just enough to loosen them, but do not
completely separate.
2. As shown in Figure 13, push on the retainer
(key 23) to push the groove valve (key 22) out of
the body (key 21), then complete disassembly.
3. Replace the groove valve O-rings (key 24) if
necessary, being sure to lightly apply lubricant to
the replacement O-rings before installing them in
the groove valve and retainer.
4. Install the groove valve (key 22) into the same
side of the body where the scale appears. Install
the retainer into the opposite side of the body and
tighten until both are secure.
5. When all maintenance is complete, refer to the
Startup and Adjustment section to
p
ut the regulator
back into operation.
Parts Ordering
When corresponding with your local Sales Ofce about
this equipment, reference the equipment serial number
found on a nameplate attached to the bonnet. When
ordering replacement parts, reference the key number
of each needed part as found in the following parts list.
Separate kits containing all recommended spare parts
are available.
Figure 13. Pushing Groove Valve Up With Retainer
23
Type EZR
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