Change The Diaphragm Type - Emerson 903 Installation, Operation And Maintenance Manual

Maintenance
4. Rotate the diaphragm until hard stop or heavy resistance is achieved and additional force
does not significantly rotate the diaphragm into the compressor.
5. If replacing a PTFE diaphragm, re-invert the diaphragm.
6. Back off (no more than half turn) until the bolt holes in diaphragm and the bonnet flange
align.
7. Rotate the handwheel counterclockwise just enough to permit the flange area of the
diaphragm to rest flat against the flange area of the bonnet.
8. Replace the topworks assembly on the body and tighten the bonnet fasteners.
For more information, see
9. Set the travel stop.
For more information, see

Change the diaphragm type

1. Remove the bonnet nuts and lift off the bonnet.
2. Remove the plastic cap and travel stop nut.
3. Loosen the handwheel setscrew(s) and remove the handwheel from the bonnet.
4. Remove the diaphragm, spindle and bushing assembly by withdrawing it through bottom of
bonnet.
5. Remove the compressor.
14
Tighten the bonnet fasteners
the travel stop
Handwheel Operated Valves (903, 913, 963) Installation, Operation, and Maintenance Manual
(page 7).
(page 9).
Designed and Manufactured by ITT