Replace The O-Rings - Emerson 903 Installation, Operation And Maintenance Manual

If the compressor to spindle connection is a ... Then ...
Spring pin
"T" slot
6. Change to the new compressor.
If you are changing ...
From an elastomer to a PTFE diaphragm
From a PTFE to an elastomer diaphragm
7. Install the new compressor.
If the compressor to spindle connection is a ... Then ...
Spring pin
"T" slot

Replace the o-rings

1. Disassemble the topworks:
a) Remove the bonnet nuts and lift off the bonnet.
b) Remove the plastic cap and travel stop nut.
c) Loosen the handwheel setscrews and remove the handwheel from the bonnet.
d) Remove the diaphragm, spindle, and bushing assembly by withdrawing it through the
2. Remove o-ring 1 from the groove in the bushing outside diameter.
Figure 5: O-rings for 0.50–2.00 inch (DN
15–50) valve
1. O-ring 1
2. O-ring 2
3. O-ring 3
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.
Handwheel Operated Valves (903, 913, 963) Installation, Operation, and Maintenance Manual
Designed and Manufactured by ITT
bottom of the bonnet.
For more information, see
Drive out the spring pin that retains the compres-
sor
Slide the compressor off the spindle
Then ...
Install a tube nut into the hexagonal hole in the
new compressor
Change to the new compressor.
Locate the new compressor on the spindle and
drive in the spring pin
Slide the new compressor onto the spindle
Figure 6: O-rings for 2.50–4.00 inch (DN 65–100)
valve
1. O-ring 1
2. O-ring 2
3. O-ring 3
4. O-ring 4
Valve size (DN)
15–50
80–150
Lubrication requirements
Maintenance
Action
Remove o-ring 2 from the groove
in spindle outside diameter.
Remove o-rings 2 and 4 from the
spindle plug.
(page 12).
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