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627B Series
RELIEF VALVE O-RING (KEY 28)
PUSHER POST (KEY 19)
RELIEF SEAL RETAINER (KEY 47)
W4668
W5433-1
Diaphragm and Spring Case Area
Maintenance Procedures
These procedures are for gaining access to the control spring,
diaphragm assembly and lever assembly. All spring pressure
must be released from the diaphragm casing before these
steps can be performed.
While using the following procedures, refer to
Figures 6 through 8 for key number locations.
1. Remove the adjusting screw cap (key 36), loosen the
lock nut (key 34) and turn the adjusting screw (key 35)
counterclockwise until all compression is removed from the
control spring (key 32).
2. Remove the spring case cap screws (key 37), the
nameplates and lift off the spring case (key 29). If changing
the control spring (key 32) or repositioning the spring
case (key 29) is the only maintenance required, install the
replacement control spring or rotate the spring case so it is
correct for the application. Skip to step 21. For diaphragm
area maintenance, continue with step 3.
3. Remove the diaphragm limiter O-ring and diaphragm limiter
(keys 51 and 50, on the Type 627BHM only). Remove the
diaphragm assembly by tilting it so that the pusher post
(key 19) slips off the lever (key 15).
4. If it is necessary to replace the lever assembly, remove the
lever cap screws (key 18).
5. Install the replacement lever (key 15) into the lever retainer
(key 16) by inserting the lever pin (key 17). Secure the lever
assembly into the diaphragm casing with the cap screws
(key 18) and torque the cap screws to torque values shown
in Table 4.
8
DIAPHRAGM (KEY 23)
DIAPHRAGM CONNECTOR
ASSEMBLY (KEY 21)
DIAPHRAGM (KEY 23)
PUSHER POST (KEY 19)
PUSHER POST O-RING (KEY 52)
Figure 5. Diaphragm Assemblies
DIAPHRAGM HEAD (KEY 24)
DIAPHRAGM CONNECTOR NUT (KEY 22)
LOWER SPRING
SEAT (KEY 31)
TYPES 627BM AND 627BMR
DIAPHRAGM
HEAD CAP
SCREW (KEY 46)
TYPE 627BHM
Perform steps 6 through 11 for Types 627BM and 627BHM
Variations Regulators only:
6. For Types 627BM and 627BHM Regulators
(Figures 6 and 8), use steps 7 through 11 to disassemble
and reassemble the diaphragm assembly.
7. Remove the diaphragm head cap screw (key 46), lower
spring seat (key 31, Type 627BM) and diaphragm head
(key 24). On the Type 627BHM, remove the pusher post
O-rings (key 52). Separate the diaphragm (key 23) from the
pusher post (key 19).
8. Install the diaphragm (key 23), in reverse order in step 7,
on the pusher post (key 19), insert and finger tighten the
diaphragm head cap screw (key 46).
9. Hook the pusher post on the lever (key 15), then turn the
diaphragm (key 23) to match the holes in the diaphragm
with the holes in the spring casing.
10. Unhook the pusher post from the lever (key 15) and torque
the diaphragm head cap screw (key 46) to torque values
shown in Table 4.
11. Hook the pusher post on the lever (key 15) and check the
hole alignment. If necessary, loosen the cap screw (key 46)
and reposition the diaphragm (key 23) on the pusher post
(key 19). Retorque the screw (see step 10). Skip to step 20.
Perform steps 12 through 19 for Type 627BMR Variation
Regulator only:
12. For Type 627BMR Regulator (Figure 7), use
steps 13 through 19 to disassemble and reassemble
the diaphragm assembly.
13. Remove the guide retainer (key 26) and separate the
diaphragm parts. Refer to Figure 7 for the sequence
of parts.
RELIEF VALVE SPRING (KEY 27)
GUIDE RETAINER O-RING (KEY 48)
RELIEF SPRING
GUIDE RETAINER
SEAT (KEY 25)
(KEY 26)
DIAPHRAGM LIMITER (KEY 50)
DIAPHRAGM LIMITER O-RING (KEY 51)
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