Cameron GENERAL VALVE Twin Seal 400 Series, Installation, Operation And Maintenance Manual

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E N G I N E E R E D & P R O C E S S V A L V E S
07/2011 / IOM-GEN-TWIN-03 11
Installation, Operation and Maintenance Manual
GENERAL VALVE
®
Twin Seal
™
MODEL 375H
Item
No. 375 H
Part No. Description Req’d
1 21-419 Operator Housing 1
2 22-417 Upper Stem 1
3 22-418 Lower Stem 1
4 27-418 Indicator Shaft 1
5 27-419 Indicator Flag 1
6 28-406 Handwheel 1
7 45-411 Key 1
8 46-425 Bushing 1
9 48-405 Roller 1
10 50-402 Grease Retainer 1
11 62-32 O-Ring 1
12 64-415 Protector 1
13 64-417 Insignia Plate 1
14 65-402 Grease Seal 1
15 66-409 Ball Bearing 1
16 72-5 Capscrew 4
17 74-6 Screw 1
18 74-9 Set Screw 1
19 75-434 Nut 1
20 76-411 Lube Fitting 1
21 77-407 Guide Pin 1
22 77-423 Drive Pin* 1
23 77-453 Roll Pin 1
24 78-413 Retaining Ring 1
25 78-414 Retaining Ring 1
375 H is Used on Models:
2” C811
2” C821
3” CA811
3” CA821
OPERATOR DISASSEMBLY
1. Unscrew (17) and remove indicator flag (5).
2. Remove the stem protector (12).
3. Remove the handwheel nut (19),
handwheel (6), key (7) and grease
retainer ring (10).
4. Remove the retainer ring (25) and pull out
the upper stem (2) with lower stem (3),
bearing (15), roller (9) and indicator shaft
subassembly (4) out through the top of
the housing (1).
5. Remove set screw (18) from bottom of
lower stem and push indicator shaft sub-
assembly (4) out through the bottom of
the lower stem.
6. Separate the stems and remove the
retaining ring (24) and the bearing (15)
from the upper stem.
7. Remove grease seal (14) and bushing (8)
(if required) from top of upper stem (2).
8. Remove O-Ring (11) from inside housing
.
OPERATOR ASSEMBLY
1. Install O-Ring (11) in housing (1).
2. Place the bearing (15) on the top of the
upper stem (2). Install retaining ring (24).
3. Apply a liberal coating of grease to all
surfaces of upper stem (2) and inside and
outside of lower stem (3).
4. Thread the upper stem and lower stem
together such that the drive pin (22) in the
upper stem comes against the shoulder at
the TOP of the lower stem (3) and the
detent recess in the upper stem is exactly in
line with roller opening in the lower stem.
NOTE: This operation may require several
attempts as the threads are multiple start
and do not always assemble correctly with
the first try.
5. Install the indicator shaft sub-assembly (4)
up through both stems. Align the detent
hole in the indicator disc with the threaded
hole in the lower stem and fasten with
set screw (18). Set screw must be below the
outside surface of the lower stem.
6. Place the roller (9) in the side opening of
the lower stem. A liberal application of
grease will hold the roller in position.
7. Place the stem assembly into the housing
taking care that roller is aligned with roller
groove in housing. Push the entire
assembly down until the bearing rests on
the shoulder in the housing.
8. Install the retaining ring (25) in the top of
the housing (1).
9. Install grease retainer (10) in handwheel (6)
and place handwheel and key (7) on upper
stem. Install bushing (8) and grease seal
(14) in handwheel nut (19). Screw the nut
on the upper stem and tighten down on
handwheel securely.
10. Install stem protector (12).
11. Install indicator flag (5) and secure
with screw(17).
Cross Section
19
17
20
25
15
22
9
18
21
4
5
12
14
8
6
10
24
7
2
3
1
16
23
13
11
17
5
12
4
19
7
25
10
24
15
22
9
1
2
3
18
21
16
5
8
6
11
Exploded View
* not available separately.