Table of Contents
Advertisement
Pilot Adjustment
Remove closing cap, if necessary. Loosen the
locknut. Turn the adjusting screw into the spring
case to increase the downstream pressure. Turn the
adjusting screw out of the spring case to decrease
the downstream pressure. Use a pressure gauge to
monitor the outlet pressure until the desired pressure
is reached. When the required downstream pressure
is maintained for several minutes, tighten the locknut
to lock the adjusting screw in position. Replace the
pilot closing cap, if necessary.
Shutdown
CAUTION
If the pilot bleed control line pressure is
shutdown first, the downstream system
may be subjected to full inlet pressure.
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:
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
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
When disassembling the upper and
lower actuator, always remove the long
cap screws (key 39) last to allow spring
tension force to be released in a slow
and controlled manner.
Use proper lifting techniques, when
lifting the upper and lower actuator
casings (keys 11 and 5) off the Type EZL
body (key 1). The 2-inch / DN 50
actuator assembly weighs more than
40 pounds / 18 kg.
Type EZL (Figure 7)
Seat Maintenance
1. Make a mark on the lower actuator casing (key 5),
intermediate flange (key 25) and body (key 1) to
indicate proper alignment.
2. Remove stud nuts (key 26).
CAUTION
Use proper care in moving actuator to
ensure no damage occurs to the pins or
actuator casings.
3. Carefully lift the actuator assembly (keys 11 and 5)
off the body (key 1).
4. Remove O-ring (key 34) from lower actuator casing
(key 5). Inspect the O-ring for damage or wear,
and replace if necessary. Lightly lubricate O-ring
before placing on lower actuator casing (key 5).
5. 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).
6. Remove the O-ring (key 29). Inspect for damage
or wear, and replace if necessary. Lightly lubricate
O-ring before placing in the sleeve adaptor (key 27).
7a. On the 2 and 3 inch / DN 50 and 80 sizes remove
the seat ring (key 2), spring washer (key 72), and
O-ring (key 34) (see Figure 7, Detail A.2). Inspect
the O-ring for damage or wear, replace if necessary.
Type EZL
9
Advertisement
Table of Contents
