Replace The Valve Diaphragm - Emerson Asco Bio-Pure Installation, Operation And Maintenance Manual

2. If the actuator mode of operation is fail open or fail close, then load the actuator with air.
If the actuator mode of operation is ... Then ...
Fail open
Fail close
3. Remove the bonnet fasteners.
4. Lift the topworks assembly from the valve body.
5. If the actuator mode of operation is fail open, then remove pressure load from the actuator.

Replace the valve diaphragm

1. Disassemble the valve.
For more information, see
2. Remove the diaphragm by rotating the diaphragm 90° so it slides out of the compressor.
The replacement diaphragm must be identical in grade to the original diaphragm.
3. If replacing a PTFE diaphragm, locate a new elastomer backing cushion over boss in
diaphragm.
Align the bolt pattern of the backing cushion with that of the diaphragm.
4. If you have a fail open or double acting actuator, add air to the upper chamber to expose
the compressor.
5. Invert diaphragm by pressing the center of the diaphragm face with your thumbs while
holding the edge of the diaphragm with your fingers.
NOTICE:
Do not to scratch the diaphragm bead while inverting the diaphragm.
6. Insert the diaphragm into the compressor.
a) Insert the diaphragm stud with a cross pin into the compressor.
b) Rotate the diaphragm 90° to capture the pin in the compressor.
c) Lightly tug on the diaphragm to ensure the pin has engaged in the compressor.
Bio-Pure Installation, Operation, and Maintenance Manual
Designed and Manufactured by ITT
Load the actuator with sufficient air to partially close the
valve.
Load the actuator with sufficient air to partially open the
valve.
Disassemble the valve (page 12).
Maintenance
13