ITT Advantage Actuator 2.0, Руководство по обслуживанию

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9. Back off (no more than half turn) until the bolt holes in diaphragm and the bonnet flange align.
10. 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 Reduce the air pressure until the back of the diaphragm is flat against the
bonnet.
Fail close
1. Connect the air line to the lower air cover.
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.
11. Replace the topworks assembly on the body and tighten the bonnet fasteners.
For more information, see Tighten the bonnet fasteners in this manual.
12. If the actuator mode of operation is fail open or double acting, examine the actuator upper cover for
leakage past the indicating spindle o-ring seal. If leakage is present, replace the spindle o-rings.
13. If the actuator mode of operation is fail open, release the air, allowing the valve to open.
14. If there is a travel (closing) stop, reset it to ensure proper closure.
For more information, see Adjust the travel (closing) stop in this manual.
Maintenance
Advantage
®
Actuator 2.0 Maintenance Manual 11