6.4 Disassemble the valve
1.
Remove all line pressure.
2.
Turn the valve to the open position counter clockwise at least one turn.
3.
Remove the bonnet fasteners.
4.
Lift the topworks assembly from the valve body.
6.5 Replace the valve diaphragm
1.
Disassemble the valve.
For more information, see
6.4 Disassemble the valve on page 14
.
2.
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.
3.
If replacing a PTFE diaphragm, then 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.
d) Continue rotating the PTFE diaphragm clockwise into the compressor while securing the back-
ing cushion from rotating.
6.4 Disassemble the valve
14
Handwheel Operated Valves (903, 913, 963) Installation, Operation, and Maintenance Manual
