EZH and EZHSO Series
13
1. If the pilot setting must be changed, 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:
a. Inlet block valve
b. Outlet block valve
c. Control line valve(s), if used.
3. Open the vent valves to depressurize the system.
Maintenance
!
WARNING
For both EZH and EZHSO Series, 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 federal, state and local
codes and regulations.
!
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) off the
EZH or EZHSO Series body (key 1).
The actuator assembly weighs more
than 100 lbs / 45 kg.
CAUTION
Customer cannot use another type of
eyebolt in the regulator. Only Emerson™
parts can be used to repair the unit.
CAUTION
Eyebolts are installed to aid in the
handling and installation of the Regulator
Assembly only. Do not attempt to lift
more weight than the regulator with
these eyebolts.
Polyurethane (PU) Disk Conversion
A new Polyurethane (PU) disk is being phased in
during 2014. The new material offers improved
durability in abrasive environments. To convert
EZH and EZHSO Series units currently in service, the
user will need to order three parts; retainer (key 31),
disk assembly (key 30) and seat ring (key 2). Please
contact your local Sales Ofce with any questions
about parts selection.
Main Valve and Actuator Maintenance
NPS 1 through 3 / DN 25 through 80
Disk Maintenance (Refer to Figures 8 and 9)
For EZH Series:
1. Remove nuts (key 26).
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
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.
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 lock washers (key 32) and hex socket
cap screws (key 33) and tighten. See Torque
Specications (Table 4) for proper torque values.
(24 Seiten)
(170 Seiten)
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