Diaphragm Parts; Body Area; Diaphragm And Spring Case Area - Fisher EZR Instruction Manual

Type EZR

Diaphragm Parts

1. Remove the closing cap (key 16), loosen the
locknut (key 12), and back out the adjusting screw
(key 11) until compression is removed from the
control spring (key 9).
2. Remove the machine screws (key 13, not shown)
and separate the spring case (key 2) from the
body (key 1). Remove the control spring seat
(key 8), the control spring (key 9). If used,
remove the diaphragm limiter (key 10). Replace
if necessary.
3. Remove the diaphragm assembly (key 7) and
inspect the diaphragm.
4. On Type 161EBM pilots, inspect the stem guide
seal assembly (key 19) and, if damaged, replace
the complete assembly. Inspect the outer O-ring
(key 22) and replace if necessary.
5. Install the diaphragm assembly (key 7) and push
down on it to see if the valve plug (key 4) strokes
smoothly and approximately 1/16-inch (1,6 mm).
6. Stack the control spring (key 9), control spring
seat (key 8), and diaphragm limiter (key 10)
(if used) on the diaphragm assembly (key 7). If
used, make sure the diaphragm limiter is installed
beveled side up on Types 161EB and 161EBM pilots
with 200 to 350 psig (13,8 to 24,1 bar) outlet
pressure range. Lightly apply lubricant to
the control spring seat.
7. Install the spring case (key 2) on the body (key 1)
with the vent (key 18) properly oriented. Make sure
the vent is not directly over inlet or outlet piping due
to possible icing. Install the machine screws
(key 13, not shown), using a crisscross pattern,
torque them to 5 to 7 foot-pounds (6,8 to 9,5 N•m)
for stainless steel bodies and 2 to 3 foot-pounds
(2,7 to 4,1 N•m) for aluminum bodies. Lubricate the
adjusting screw threads.
8. When maintenance is complete, refer to the
Startup and Adjustment section to put the regulator
back into operation, and adjust the pressure
setting. Tighten the locknut (key 12), replace the
closing cap gasket (key 17) if necessary, and
install the closing cap (key 16).
161AY Series Pilots (Figure 20)

Body Area

Use this procedure to gain access to the disk
assembly, orifice, and body O-ring. All pressure must
be released from the diaphragm casing, and the disk
assembly must be open, before these steps can
be performed.
20
W4570-1
Figure 11. 161EB Series Pilot Trim Removal/Installation
1. Remove the cap screws (key 2) and separate the
diaphragm casing (key 4) from the body (key 1).
2. Remove body seal O-ring (key 11) and the back-up
ring (key 50). Inspect the body seal O-ring and
replace if necessary.
3. Inspect and replace the orifice (key 5) if necessary.
Lubricate the threads of the replacement orifice
with a good grade of light grease and install with
29 to 37 foot-pounds (39 to 50 N•m) of torque.
4. Remove the cotter pin (key 15) if it is necessary to
replace the disk assembly (key 13) or the throat
seal O-ring (key 31) of a Type 161AYM.
5. For a Type 161AYM, inspect the throat seal O-ring
(key 31) and remove the machine screw (key 33).
Replace O-ring if necessary.
6. Install the disk assembly (key 13) and secure it
with the cotter pin (key 15).
7. Place back-up ring (key 50) into the body (key 1)
then place the body seal O-ring (key 11) into the body.
8. Place the diaphragm casing (key 4) on the body
(key 1). Secure the diaphragm casing to the body
with the cap screws (key 2).

Diaphragm and Spring Case Area

Use this procedure to change the control spring and to
inspect, clean, or replace parts in the spring case and
diaphragm assembly.
To Change the Control Spring:
1. Remove the closing cap (key 22), and turn the
adjusting screw (key 35) counterclockwise until
all compression is removed from the control
spring (key 6).
2. Change the control spring (key 6) to match the
desired spring range.
3. Replace the adjusting screw (key 35).