Emerson Fisher 627 - Diaphragm Maintenance for Specific Models; Maintenance for 627 M;627 HM;627 MR

627 Series
12
7. Apply lubricant to a replacement diaphragm casing
O-ring (key 4, Figure 7, 8, 9, or 12) and install it onto
the boost body (key 6). Skip to step 14.
8. For the Type 627 or 627H regulators, be sure to
insert the pitot tube (tab) into the outlet side of the
body (see Figure 7 or 12). Skip to step 14.
Perform steps 9 through 19 for Types 627M,
627HM, and 627MR Regulators only:
9. Use steps 10 through 14 to remove and replace
the stem assembly.
10. To remove the blocked throat (key 43), insert a
screw driver blade into the groove provided in the
throat and pry it out of the diaphragm casing
(key 5). Inspect and replace parts as necessary.
11. Inspect and, if necessary, replace the blocked
throat O-rings (key 44, Figure 5) and back-up rings
(key 45, Figure 5).
12. Apply lubricant to replacement blocked throat
O-rings (key 44) and back-up rings (key 45).
13. Apply lubricant to the replacement stem O-ring
(key 11) and stem back-up rings (key 12) and
install them on the stem (key 10).
14. For assembly, lubricate the stem (key 10) and
insert the diaphragm casing (key 5) and hook it
on the lever (key 15).
15. Lubricate the contact points of the lever (key 15).
16. Insert parts into the diaphragm casing (key 5)
that were removed in steps 5 and 6 or step 10
(see Figure 5).
17. Install the disk assembly (key 9), line up the hole
in the disk assembly and stem (key 10) and insert
the hair pin clip (key 13).
18. Position the diaphragm casing (key 5) plus
attached parts in relation to the body (key 1) so
that they are correct for the application.
W5433-1
Figure 6. Diaphragm Assemblies
RELIEF VALVE O-RING
(KEY 28)
PUSHER POST
(KEY 19)
DIAPHRAGM
HEAD (KEY 24)
DIAPHRAGM
(KEY 23)
DIAPHRAGM CONNECTOR
NUT (KEY 22)
RELIEF VALVE
SPRING (KEY 27)
RELIEF SEAL
RETAINER (KEY 47)
DIAPHRAGM CONNECTOR
ASSEMBLY (KEY 21)
LOWER SPRING
SEAT (KEY 31)
RELIEF SPRING
SEAT (KEY 25)
W4668
TYPE 627, 627R, 627LR, 627M, OR 627MR
PUSHER POST
(KEY 19)
DIAPHRAGM
(KEY 23)
PUSHER POST
O-RING (KEY 52)
DIAPHRAGM
HEAD (KEY 24)
DIAPHRAGM LIMITER
O-RING (KEY 51)
DIAPHRAGM
LIMITER (KEY 50)
DIAPHRAGM
HEAD CAP
SCREW (KEY 46)
TYPES 627H AND 627HM
GUIDE RETAINER
O-RING (KEY 48)
GUIDE RETAINER
(KEY 26)