ITT Engineered Valves 903 Installation, Operation And Maintenance Manual page 19

3. Unscrew the diaphragm and spindle assembly from the handwheel bushing.
4. Remove o-rings:
Valve size (in)
.5–2
2.5–6
5. Install the thrust bearing or washer:
a) Lubricate the thrust bearing or washer.
For more information, see
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)
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.
Handwheel Operated Valves (903, 913, 963) Installation, Operation, and Maintenance Manual
Valve size (DN)
15–50
80–150
6.3 Lubrication requirements on page
6.3 Lubrication requirements on page
Valve size (DN)
15–50
80–150
O-ring 1
.445 x .063
.571 x .063
.634 x .063
#119
#119
#119
#218
#218
#220
Action
Remove o-ring 2 from the
groove in spindle outside diame-
ter.
Remove o-rings 2 and 4 from
the spindle plug.
13.
13.
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
#107
#109
#110
#112
#112
#112
#209
#209
#210
6.7 Replace the o-rings
O-ring 4
–
–
–
–
–
–
#212
#212
#214
17