16. Lubricate the diaphragm (key 20) on the upper casing
contact area.
17. Lubricate and mount the O-ring (key 69) on the cap
(key 70). Lubricate and mount O-rings (key 9) and
anti-friction rings (key 8) inside the cap. Unscrew the
eye bolts (key 35) from the upper spring seat (key 73)
and carefully place the cap on the upper actuator
casing (key 11). Align the travel indicator hole on the
cap to the upper actuator casing travel indicator hole.
Lubricate cap screws (key 77) and attach cap (key 70)
to the upper casing (key 11) using cap screws (key 77).
Bag diaphragm flat to lower actuator casing diaphragm
flange contact area. Carefully place the upper actuator
casing on the top of the lower actuator casing/trim
system using a stud to guide.
note
rotate the upper casing such that the outer
holes for sensing lines are perpendicular to
gas flow and outer holes of lower casing.
18. Lubricate threads on bolts (key 21).
19. Bolt together the upper and lower actuator casings
(keys 11 and 5) using cap screws (key 21), washers
(key 22) and hex nuts (key 23). Tighten cap screws
using a “star” criss-cross pattern for five times until
proper specified torque is achieved.
20. Mount O-ring (key 75) on the cap (key 70).
21. Screw the eye-bolts (key 35) on the cap (key 70).
22. If present, set the stem (key 139) through the casing
hole and tap it into the groove in the diaphragm plate
(key 18). Slide the travel indicator fitting (key 141) over
the stem and tighten to the cap (key 70).
Type EZH Travel indicator Maintenance
A new and improved travel indicator has been phased in
during 2013. The new version improves the O-ring stem seal
to minimize leakage and extend service life. The components
of the legacy and new versions are not interchangeable. If
maintenance is performed on the new travel indicator, it is
recommended to replace the entire travel indicator assembly
with the new version. Part numbers for the assemblies are
shown in the parts list. Figure 5 shows the difference between
the designs. The spare parts kits will support either design.
Take care to use the correct O-ring (key 142A or 142B) when
performing maintenance, see parts list for the appropriate
part number.
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 20 ft-lbs / 27.1 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 with a
torque of 3.7 ft-lbs / 5.0 N•m.
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.
9
Type EZH Relief
