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
4.2 Tighten the bonnet fasteners on page 8
.
9.
Set the travel stop.
For more information, see
4.3 Set the travel stop on page 10
.
6.5 Replace the valve diaphragm
Handwheel Operated Valves (903, 913, 963) Installation, Operation, and Maintenance Manual
15
