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Maintenance
b) Install the thrust bearing or washer on the shoulder of the bushing.
6. Cover the stem threads with masking tape to protect the o-rings during installation.
7. Lubricate o-rings.
For more information, see
Valve size (in)
.5–2
2.5–6
Select the proper o-rings for the valve size.
Valve size, inches (DN) O-ring 1
0.50 (15)
0.75 (20)
1.00 (25)
1.25 (32)
1.50 (40)
2.00 (50)
2.50 (65)
3.00 (80)
4.00 (100)
8. Remove the masking tape from the stem threads.
9. Screw the diaphragm and spindle assembly into the bushing.
10. Install the diaphragm, spindle, and bushing assembly into the bonnet.
Verify that the shim washer is installed.
11. Install the handwheel:
a) Tighten the setscrews, ensuring the setscrew ends engage the bushing holes.
b) If you do not have a plastic handwheel, then use a thread locking compound.
12. Install o-ring 3 and screw the cap onto the bushing hand tight.
Select the proper o-ring for the valve size.
Valve size, inches (DN)
0.50 (15)
0.75 (20)
1.00 (25)
1.25 (32)
1.50 (40)
2.00 (50)
2.50 (65)
3.00 (80)
4.00 (100)
16
Lubrication requirements
Valve size (DN)
15–50
80–150
.445 x .063
.571 x .063
.634 x .063
#119
#119
#119
#218
#218
#220
Handwheel Operated Valves (903, 913, 963) Installation, Operation, and Maintenance Manual
(page 12).
Action
Lubricate o-rings 1 and 2 and
insert them into the grooves in
the bushing and spindle.
Lubricate o-rings 2 and 4 and
insert them into the grooves in
the spindle plug.
O-ring 2
O-ring 4
#107
–
#109
–
#110
–
#112
–
#112
–
#112
–
#209
#212
#209
#212
#210
#214
O-ring 3
#118
#119
#121
#122
#122
#122
#128
#128
#130
Designed and Manufactured by ITT
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