Type EZH Relief or Backpressure Regulator
13
1. Remove plastic travel indicator cover (key 138).
2. Loosen travel indicator bushing (key 140) and remove it
by sliding it over the travel indicator stem (key 139).
3.
Remove indicator fitting (key 141) and inspect O-ring
(key 143). Remove O-ring (key 142B) and back-up rings
(key 160). Replace and lubricate O-ring if damaged.
Pull up on the travel indicator stem (key 139) to force the
spring collet (key 144) out of the diaphragm head groove.
Examine these parts and the stem for wear and replace
if necessary.
4. Examine the retaining ring (key 145) for wear, and
replace if necessary.
5. Insert the travel indicator stem (key 139) and spring collet
(key 144) back into the diaphragm head groove. Replace
the indicator fitting (key 141) and O-ring (key 143), and
tighten with a referenced torque of 3.7 foot-pounds /
5.0 N•m.
6. Lubricate the O-ring (key 142B) and back-up rings
(key 160, 2 required). Place one back-up ring on the
stem (key 139) followed by the O-ring and then the other
back-up ring. Push into groove of the indicator fitting
(key 141).
7. Slide the travel indicator bushing (key 140) over the travel
indicator stem (key 139) and tighten firmly in place.
8. Replace the travel indicator cover (key 138) and tighten
firmly in place.
Type PRX/182 Maintenance (Figure 7)
CAUTION
Always remove spring (key 7) tension before
performing maintenance on this unit. To
remove spring tension, loosen locknut (key 2)
and back out adjusting screw (key 1) until
compression is removed from the spring.
Lower Diaphragm Maintenance
1. Disconnect pilot and remove it from the line.
2. Remove machine 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), lower diaphragm plate (key 15), and O-ring
(key 18). Inspect parts for damage or wear, replace
if necessary.
5. Lightly lubricate the O-ring (key 25). Place O-ring
over the stem (key 23) and press it down into the body
(key 16).
6. Lightly lubricate the rims of the diaphragm (key 14) and
place it on top of the lower diaphragm plate (key 15). Set
the diaphragm plate (key 13) on the diaphragm (key 14).
7. Lightly lubricate the O-ring (key 18) and place it in the
lower cover (key 21).
8. 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 the Upper Case
Maintenance section.
9. Insert washers (key 11) and machine screws (key 10) in
the lower cover (key 21) and tighten uniformly to ensure
proper seal.
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).
