4. Turn the air source on and fully open the actuator; so that the diaphragm is retracted
from the valve seat. The position indicator should be protruding from the top of the
actuator. This pulls the diaphragm back to allow firm compression of the shoulder
seal.
5. Make sure that the actuator flange and the valve flange are close enough to easily
reinstall the clamp.
6. Reinstall the clamp on the actuator/valve assembly by hand. A double-bolt, high-
pressure clamp can be used, alternating between the two bolts to ensure even
tightening.
It might be necessary to push down on the actuator assembly while assembling the
clamp.
7. Using a torque-controlled socket wrench set to 2.26Nm (50in-lbs), tighten the clamp.
If using a double-bolt clamp, tighten the clamp by alternating between the two bolts
until the bolts are fully torqued.
Unlike elastomer diaphragm materials, the following steps are necessary to finish
preparing a new PTFE diaphragm:
8. Open the valve and steam the valve for 15 minutes.
9. Close the valve and steam again for 30 minutes.
10. Check the valve seat for integrity. There should be no loss of pressure.
Remove the diaphragm
Do not open the valve clamp during steaming or while the valve is
under pressure.
1. De-pressurise the system.
2. Open the valve (by turning the air on).
3. Remove the clamp.
4. Close the valve (by turning the air off).
m-radialdiaphragmvalve-en-02 17
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