Maintenance
Bio-Pure Installation, Operation, and Maintenance Manual
14
This also properly positions the bolt pattern of the diaphragm with that of the bonnet.
7. If replacing a PTFE diaphragm, re-invert the diaphragm.
8. If the actuator mode of operation is fail open or fail close, select one of these steps.
If the actuator
mode of
operation is ...
Then ...
Fail open
1.
Connect the air line to the upper actuator chamber.
2.
Load the chamber with the full recommended air pressure. Be sure to apply
enough air pressure to prevent inversion of the diaphragm.
3.
Reduce the air pressure until the back of the diaphragm is flat against the
bonnet.
Fail close
1.
Connect the air line to the bonnet’s cylinder.
2.
Load the chamber with sufficient air to move the diaphragm upward until the
back of diaphragm is flat against the bonnet. Do not apply excessive air
pressure that results in inversion of the diaphragm.
Double acting
Remove the air line.
9. For more information, see
10. If the actuator mode of operation is fail open, then release the air, allowing the valve to
open.
11. If there is a travel (closing) stop, then reset it to ensure proper closure.
For more information, see
Adjust the travel (closing) stop
(page ).
Travel (closing) stop for manual valve
A travel stop is included in all manual valve configurations. The purpose of the travel stop is to
prevent over closing of the valve and prolong diaphragm life. ITT recommends you adjust the
travel stop:
• during valve installation
• after diaphragm replacement
• after any other maintenance procedure
Designed and Manufactured by ITT
