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Maintenance
Diaphragm & Valve Actuator Replacement
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 5.
1. Relieve the pressure.
2. Remove the regulator from the fluid line.
3. Remove the six cap screws (19) from the regulator
housing (24). See Fig. 2.
4. Remove the diaphragms (26 and 27). Inspect the
carbide pin in the valve actuator (9) for wear.
Replace if necessary.
5. Install the new diaphragms, with the PTFE
diaphragm (26) facing toward the regulator
housing (24), as shown in Fig. 2.
6. Install the valve actuator (9) and six cap screws
(19). Torque the cap screws in the order shown in
Fig. 2.
26
27
PTFE
(white)
16
9
24
1*
19
HytrelR requires uniform compression.
Torque each bolt no more than 1/8 turn at a
time in the sequence shown. Repeat pattern
until uniform torque of 60–70 in-lb (6.8–7.9
N-m) is obtained. HytrelR diaphragm should
never extrude more than 1/16 in. on a side.
Torque to
30 to 35 ft-lb
(41 to 47 N-m)
16
43
25
IN
OUT
Torque Sequence
HytrelR
(off-white)
Fig. 2
7533A
HytrelR is a registered trademark of the DuPont Company.
18