Type 92S
12
9. Unscrew the bellows retainer (key 8) and remove
the bellows (key 9). Replace worn parts as
necessary, and install the bellows and bellows
retainer. Tighten the bellows retainer to between
19 and 25 foot•pounds (26 and 34 N•m).
10. Install the diaphragm gasket. Install both
diaphragms with their raised preformed centers
facing toward the spring case.
11. Lubricate the upper spring seat and the exposed
threads of the adjusting screw. Install the lower
spring seat (key 11, Types 6492H and 6492HT
pilots only) or diaphragm plate assembly (key 24,
Type 6492L pilot only), control spring (key 12),
upper spring seat (key 13), and spring case
(key 14). Insert and tighten the cap screws
(key 17) to between 12 and 18 foot•pounds
(16 and 24 N•m) of torque, using a crisscross
bolting pattern.
12. When pilot maintenance is complete, refer to the
Startup section to put the regulator back in
operation and adjust the pressure setting.
Type 92S Main Valve
Perform these procedures if replacing the piston(s),
cylinder(s), stem(s), seals, valve plug, or seat ring.
All key numbers are referenced in Figure 5 except
where otherwise indicated. Instructions are given for
complete disassembly and assembly. Disassemble
the main valve only as far as necessary to complete
the required maintenance. Then, begin the assembly
procedure at the appropriate step.
note
The regulator may remain in the pipeline
during maintenance procedures unless
the main valve body is replaced or
removed for repairs.
Whenever a gasket seal is disturbed by
removing or shifting gasketed parts, a
new gasket should be installed upon
reassembly. This is necessary to ensure
a good gasket seal.
Disassembly
1. Disconnect all tubing and remove the pilot from
the main valve.
2. Remove the cap screws (key 3, not shown) from a
cast iron body, or stud nuts (key 4) from a steel
body, and lift off the body flange.
3. For the 1, 1-1/2, and 2-inch sizes (DN 25, 40,
and 50), remove the top cylinder (key 17), and
pull out the top piston with attached stem
and other parts. Remove the hex nut (key 41),
lockwasher (key 40), top ring retainer (key 26),
and top piston ring (key 25) from the top piston
(key 24).
4. For the 1, 1-1/2, and 2-inch sizes (DN 25, 40,
and 50), lift off the cylinder spacer (key 21), and
remove the stem seal retainer (key 23) and stem
seal (key 22) from the spacer.
5. Remove the cylinder (key 17), piston (key 24) with
attached parts, and spiral wound gasket (key 8).
6. Remove the cotter pin (key 16, 1, 1-1/2, and 2-inch
(DN 25, 40, and 50) sizes only), stem nut (key 15),
lower stem (key 9) with hex head, valve plug (key 6),
piston ring retainer (key 26), piston ring (key 25),
bottom piston ring retainer (key 26, applicable for all
sizes), piston (key 24), spring (key 12), piston spacer
(key 11), cage (key 5) and seat ring (key 7).
7. If a Whisper Trim® noise attenuator is used, remove
the plug spacer (key 33, 2-inch (DN 50) size only) ,
deflector (key 36, 2-inch size only) (DN 50), and
screen (key 37).
8. Either remove the retaining ring (key 14), or remove
the spring seat, washer, and O-ring (keys 32, 34,
and 38), if it is necessary to remove the baffle
(key 13).
Assembly
1. Inspect and replace parts as necessary, making
sure that the hollow passage in the upper
stem (key 20, 1, 1-1/2, and 2-inch (DN 25,
40, and 50) sizes only) is free from debris.
2. Install a spiral wound gasket (key 8) into the body
(key 1).
3. If installing a new valve plug and/or a new
seat ring, or lower stem, lap the seating surfaces
together outside the body. Use a commercial
lapping compound or a mixture of solidified
vegetable oil and 600-grit or finer silicon carbide
or aluminum oxide.
note
if a Whisper Trim
®
noise attenuator is
used, install the screen (key 37), the
deflector (key 36, 2-inch (DN 50) size
