17
Shutdown
CAUTION
If the pilot bleed control line pressure
system may be subjected to full inlet
pressure (Pu).
1. If the pilot setting must be disturbed, be sure to
keep some tension on the spring. This will prevent
trapping inlet pressure during blow down.
2. Slowly close the valves in the following order:
- Inlet block valve,
- Outlet block valve,
- Control line valve(s), if used.
3. Open the vent valves to depressurize the system.
Maintenance
For both Types EZH and EZHSO DN 100, never
remove or disconnect the check valve installed
between the two casings.
The regulator parts are subject to normal wear
and must be inspected periodically and replaced
as necessary.
The frequency of inspection and replacement depends
on the severity of service conditions and on applicable
codes and regulations.
Use silicone grease for O-rings and diaphragm,
molybdenum graphite grease for spring and
mechanical parts.
WARNING
To avoid personal injury or property
damage from sudden release of
pressure, isolate the regulator
from the pressure system and
release all pressure from the pilot
and main valve before performing
maintenance operations.
CAUTION
Use proper lifting techniques, when
lifting the upper and lower actuator
The actuator assembly weighs more
than 45 kg.
Main Valve and Actuator Maintenance
Disk Maintenance DN 25, 50 and 80
(Figure 16)
Type EZH Disk Maintenance
1. Remove screws (key 24).
2. Carefully lift the upper actuator casing and lower
actuator casing assembly (keys 11 and 5) off the
body (key 1).
3. Remove the hex socket cap screws (key 33) and
spring lock washers (key 32). Lift off the disk holder
assembly (key 30) and disk retainer (key 31).
4. Remove the O-ring (key 29). Inspect the O-ring for
damage or wear and replace if necessary. Lightly
lubricate O-ring before placing in the sleeve adaptor
(key 27).
5. Remove the cage (key 3), seat ring (key 2) and
O-ring (key 34). Inspect the O-ring for damage or
wear and replace if necessary. Lightly lubricate O-ring
before placing in the body (key 1).
6. Set the seat ring (key 2) back in the body (key 1) with
the curved side down and the seat edge up. To check
O-ring (key 7), skip to the Intermediate Flange O-ring
Maintenance section. Place the cage (key 3) on top
of seat ring. The cage will engage the step on the
seat ring.
7. Place the disk holder assembly (key 30) and disk
retainer (key 31) on the sleeve adaptor (key 27).
8. Insert the spring lock washers (key 32) and hex
socket cap screws (key 33) and tighten. See Torque
Specication table for proper torque.
9. Carefully lift the upper actuator casing and lower
actuator casing assembly (keys 11 and 5) and place
on the body (key 1). Secure the screws (key 24). See
Torque Specication table for proper torque.
Type EZHSO Disk Maintenance
1. Remove screws (key 24).
2. Carefully lift the upper actuator casing and lower
actuator casing assembly (keys 11 and 5) off the
body (key 1).
3. Remove the hex socket cap screw (key 154). Lift off
the disk holder assembly (key 30).
4. Remove the O-ring (key 29). Inspect the O-ring for
damage or wear and replace if necessary. Lightly
lubricate O-ring before placing in the sleeve adaptor
(key 27).
5. Remove the cage (key 3), seat ring (key 2) and
O-ring (key 34). Inspect the O-ring for damage or
wear and replace if necessary. Lightly lubricate O-ring
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