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SPRING SEAT AND
SPRING SEAT RETAINER
(KEYS 77 AND 78)
LOWER CASING
KEY (KEY 5)
4. To remove the disk assembly (key 9) once the stem
assembly has been removed from the lower casing, hold
the stem (key 10) in place by securing a wrench on the
spring seat retainer (key 78) and loosen the disk assembly
with a 5/32 in. / 3.97 mm allen wrench inserted into the
center of the disk. Inspect and, if necessary, replace the
static O-ring (key 80) if the disk assembly is removed.
5. Verify that the passageway through the center of the disk
assembly (key 9) is clear of any blockages.
6. Once disk maintenance is complete, slide stem assembly
into diaphragm casing (key 5), skip to Diaphragm and
Spring Case Area Maintenance Procedure section to build
the actuator.
Stem Assembly Maintenance
7. Use steps 8 through 22 to remove and replace the
stem assembly.
8. 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).
9. Remove the spring case cap screws (key 37) and lift off the
spring case (key 29).
10. Remove the diaphragm limiter O-ring and diaphragm limiter
(keys 51 and 50, on Type 627BHM only). Remove the
diaphragm assembly by tilting it so that the pusher post
(key 19) slips off the lever (key 15).
11. Unhook the lever (key 15) from the spring retainer (key 78)
to free the stem assembly.
12. To remove stem assembly, insert a screw driver blade into
the groove provided in the blocked throat (key 43) and pry
it out of the diaphragm casing (key 5). Inspect and replace
parts as necessary.
BLOCK THROAT (KEY 43)
STEM O-RINGS
(KEYS 81, 82 AND 88)
SPRING (KEY 79)
STEM BACK UP RINGS
STEM GUIDE
(KEY 8)
Figure 4. Stem Assemblies
BLOCK THROAT
BACK-UP RINGS
STEM KEY
(KEY 10)
(KEYS 83, 84 AND 89)
BLOCK THROAT
O-RINGS (KEY 44)
13. To disassemble stem assembly, hold spring seat retainer
(key 78) while loosening the disk assembly with a
5/32 in. / 3.97 mm allen key insterted into the center of the
disk assembly (key 9). Slide blocked throat (key 43) off
of stem.
14. While holding stem (key 10) from where the disk assembly
attaches, unscrew spring seat retainer (key 78) which will
loosen the spring (key 79) and allow the stem to slide out of
the stem guide (key 8).
15. Inspect and if necessary, replace blocked throat O-rings
(key 44) and back-up rings (key 45).
16. Apply lubricant to replacement blocked throat O-rings
(key 44) and back-up rings (key 45).
17. Apply lubricant to the replacement stem O-rings
(keys 81, 82 and 88) and stem back-up rings
(keys 83, 84 and 89) and install on the stem (key 10).
18. To assemble stem assembly, insert stem (key 10) into stem
guide (key 8).
19. Apply a small amount of threadlock to the spring seat
retainer (key 78). Compress spring (key 79) with spring
seat (key 77) and torque spring seat retainer (key 78) to
torque values shown in Table 4 while holding stem. Excess
threadlock can interfere with the operation of the regulator
and potentially create unsafe conditions.
20. Insert stem assembly into blocked throat (key 43).
21. Place disk assembly O-ring (key 80) on disk assembly
(key 9). Install disk assembly on stem (key 10) and torque
to torque values shown in Table 4 while holding spring
seat retainer (key 78).
22. Slide stem assembly into diaphragm casing (key 5).
23. Continue to Diaphragm and Spring Case Area
Maintenance Procedures.
627B Series
DISK ASSEMBLY (KEY 9)
BODY (KEY 1)
(KEY 45)
STATIC O-RING
(KEY 80)
ORIFICE (KEY 2)
7
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