Type EZH Relief or Backpressure Regulator
12
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 5) 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). See Torque
Specifications (Table 3) for proper torque values.
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.
Figure 5. Type EZH Travel Indicator Assembly
APPLY LUBRICANT (L) / SEALANT (S)
(1)
:
L2 = SILICONE-BASED GREASE
S2 = ANAEROBIC METHACRYLATE SEALANT FOR THREADS
1. Lubricant and sealant must be selected such that they meet the temperature requirements.
P1766
IMPROVED TRAVEL INDICATOR DETAIL
TOP VIEW
138
139
140
141
LEGACY TRAVEL INDICATOR DETAIL
143
L2
140
140
142A
138
139
140
141
143
L2
160
L2
145
144
S2
145
144
S2
TOP VIEW
142B
L2
