ITT Advantage Actuator 2.0, Руководство по обслуживанию

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If the actuator mode of
operation is ...
Then ...
Fail close Load the air port in the bottom cover of the actuator with sufficient air
to partially open the valve.
6. Remove the bonnet fasteners.
7. Lift the topworks assembly from the valve body.
8. If the actuator mode of operation is fail open, then remove pressure load from the actuator.
9. Do you have a fail open or double acting actuator?
• If yes: Proceed to step 10.
• If no: Procedure is complete.
10. Do you have a series 33 actuator or adjustable opening stop?
• If yes: When the actuator is not on the valve body, do not allow the flats on the indicating spindle
to move below the upper cover spindle o-ring.
• If no: Procedure is complete.
Replace the valve diaphragm
1. Disassemble the valve.
For more information, see Disassemble the valve in this manual.
2. If the actuator mode of operation is fail open, pressurize the actuator by applying air to the upper
cover, slightly extending the compressor and diaphragm.
3. Unscrew the diaphragm from the compressor by turning the diaphragm counterclockwise.
The replacement diaphragm should be identical in size and grade to the original diaphragm.
4. Insert the tube nut by sliding the flat end into the actuator spindle so that it rests flush in the slot.
5. Put the compressor over top of the tube nut.
6. If replacing a PTFE diaphragm, follow these steps.
a) Install the new elastomer backing cushion over the tube nut.
b) Invert the PTFE diaphragm by pressing the center of the diaphragm face with your thumbs while
holding the edge of the diaphragm with your fingers.
c) Engage the threads of the diaphragm into the tube nut by rotating clockwise.
Maintenance
Advantage
®
Actuator 2.0 Maintenance Manual 9