Types 6492Hm And 6492Htm Pilots; Type 92B High Pressure Pilot Exploded View - Emerson Fisher 92B Instruction Manual

Type 92B
W0070_2_1A
Figure 7. Type 92B High Pressure Pilot Exploded View

Types 6492HM and 6492HTM Pilots

These procedures are to be performed if inspecting,
cleaning or replacing any pilot parts or of cycling,
erratic control or too high or too low an outlet (control)
pressure is noted. Perform only those procedures
in this section required to correct the problem. Key
numbers are referenced in Figure 15.
Before performing any maintenance,
loosen the hex nut (key 16), if used,
and turn the set screw (key 15)
counterclockwise until all compression
is removed from the control spring
(key 12). Remove the pilot from the pipe
nipple and connectors.
12
SET SCREW
JAM NUT
SCREWS (8)
SPRING CASE
UPPER SPRING SEAT
SPRING
LOWER SPRING SEAT
DIAPHRAGMS (2)
DIAPHRAGM GASKET
BELLOWS RETAINER
BELLOWS
VALVE STEM
VALVE BODY
PIPE PLUG
CHECK VALVE ASSEMBLY
ORIFICE
VALVE PLUG
VALVE PLUG SPRING
STRAINER SCREEN
VALVE PLUG GUIDE
Note
1. Unscrew the valve guide (key 2). Remove the
screen (key 77), inner valve (key 4), valve spring
(key 3) and stem (key 7). Unscrew the orifice
(key 5). Examine the orifice and plug seating
surfaces for damage.
2. Clean and replace parts as necessary. Apply high
temperature sealant to the orifice threads. Thread
the seat ring into place and tighten using 19 to
25 ft-lbs / 26 to 34 N•m of torque.
3. Handle the parts carefully, and place the valve
spring (key 3) in the valve guide (key 2). Slide the
inner valve (key 4) over the spring and into the
valve guide. Place the screen (key 77) onto the
valve guide. Place the stem (key 7) in the center
hole of the valve guide. Apply sealant to the valve
guide threads, and screw the guide plus attached
parts into the body (key 1).
4. Remove the pipe plug (key 74). Then remove the
pipe plug (key 94). Clean and replace the pipe
plugs as necessary.
5. Apply high temperature sealant to the threads of
the pipe plug (key 94) and install into the body
(key 1).
6. Apply high temperature sealant to the threads of
the pipe plug (key 74). Install into the body (key 1).
7. Remove the cap screws (key 17), spring case
(key 14), control spring (key 12) and upper spring
seat (key 13) from the body (key 1).
8. Remove the lower spring seat (key 11),
diaphragms (key 10) and diaphragm gasket
(key 18) from the body. Inspect and clean the
diaphragm gasket. Replace if necessary.
9. Unscrew the bellows retainer (key 8) and remove
the bellows (key 9). Replace worn parts as
necessary. Apply high temperature sealant to the
bellow retainer threads. Install the bellows and
bellows retainer. Tighten the bellows retainer using
19 to 25 ft-lbs / 26 to 34 N•m of torque.
10. Install the diaphragm gasket. Install both
diaphragms with their raised performed 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), control spring (key 12), upper
spring seat (key 13) and spring case (key 14).
Insert and tighten the cap screws (key 17) in a
crisscross bolting pattern using 12 to 18 ft-lbs /
16 to 24 N•m of torque.