5
IOM-5400
13. Lower the upper diaphragm case (22)
/ spring bonnet (23) assembly over the
spring (20), allow to rest on the diaphragm
ring (15). (Ensure alignment of match
marks per previous B 3.)
14. Install diaphragm case screws (26), flat
washers (25), and nuts (19) and tighten.
15. Apply a light coat of Bostik Never-Seez to
threads of blowdown needle (28). Thread
completely into body until the nut (27)
contacts the body (01) and then back
out two rotations. Rotate nut (27) CW to
secure nut tight.
16. Reinstall adjusting screw (28) and jam nut
(27) in top of spring bonnet (23). Install
closing cap (29).
17. Refer to Section IX for Calibration and
Testing.
18. Install pilot body assembly on nipple
(124) tight with CW rotation. Ensure the
sense tube connector (126) of the pilot
valve assembly is directly above sensing
tube connector (125) of the main valve
assembly.
19. Reconnect tubing (34) to fittings (32), (33)
and tubing (127) to fittings (125),(126).
2. Position new body gasket (02) on top of
the seal diaphragm, align gasket holes.
DO NOT cover sensing hole in the
body.
3. Align holes in the lower diaphragm case
(03) with body (01) and place the case
on top of the gasket.
DO NOT cover
sensing hole.
Use cap screws (04) to
secure lower diaphragm case (03) to the
body. (01). Tighten to 10-15 ft. lbs.
4. Slide one bolt gasket (07) and boost
diaphragm spacer (09) over threaded end
of spindle (18).
5. Place another bolt gasket (07), the boost
diaphragm (10), and the support plate-
boost (11) on spindle stud (18). Align all
bolt holes for all parts.
FOR Pilot with Pressure > 3.2 psig:
install boost pressure ring (36).
6. Install sense diaphragm spacer (12) and
the last bolt gasket (07) on spindle stud
(18).
7. Place the diaphragm case spacer (13) on
the top of the diaphragm (or on top of the
boost pressure ring (36)) and align match
marks per previous B 3.
8. Install a new sense diaphragm (14) on
spindle stud (18) and align the bolt holes
with the boost diaphragm (10) and spacer
(13).
9. Stack the sense support plate (16) and
the spring guides (17) over end of spindle
stud (18).
10. Install and tighten nut (19) to secure all
parts. (Check alignment of the bolt holes
around the circumference.)
11. Position the range spring (20) and spring
button (21) on the spring guides (17).
12. Place pressure ring (15) on top of
diaphragm (14). Recheck alignment of
bolt holes.
