Maintenance - Emerson FISHER EZH Series Instruction Manual

MAINTENANCE

For both Types EZH and EZHSO DN 100, 150 and 200,
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 casings (keys
11 and 5, Figure 16) off the body (key 1,
Figure 16).
The actuator assembly weighs more
than 45 kg.
Main Valve and Actuator Maintenance
Disk Maintenance DN 25, 50 and 80 (Figure 16)
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. For EZH Series: 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).
For EZHSO Series: Remove the hex socket cap screw
(key 154). Lift off the disk holder assembly (key 30).
Do not attempt to remove the sleeve adaptor (key 27).
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).
Types EZH and EZHSO
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. For EZH Series: Insert the spring lock washers
(key 32) and hex socket cap screws (key 33)
and tighten.
For EZHSO Series: Insert the hex socket cap screw
(key 154) and tighten.
See Torque Specification 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 Specification table for proper torque.
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