Replacing The Diaphragm - Samson 3277 Mounting And Operating Instructions

7.1 Replacing the diaphragm

Version with direction of action "actuator
stem extends" (FA)
1. Lift the actuator off the valve. See sec-
tion 9.2.
2. Unscrew the nuts (A21) and bolts (A20)
on the diaphragm case.
3. Relieve the spring compression of actua-
tors with preloaded springs (see sec-
tion 9.3).
4. Lift off the top diaphragm case (A1) and
remove springs (A10).
5. Pull the diaphragm plate assembly con-
sisting of the actuator stem (A7), dia-
phragm plate (A5), and diaphragm (A4)
out of the bottom diaphragm case (A2).
6. Clamp the bottom section of the actuator
stem (A7) into a vise using protective
A33
A36
A17
A35
A7
A4 Diaphragm
A5 Diaphragm plate
A7 Actuator stem
Fig. 11: Arrangement of parts for "stem extends" direction of action (left: 175 cm²; right: 750 cm²)
EB 8310-5 EN
A9 A5
A4
A9 Nut
A17 O-ring
A33 Nut
jaws. Make sure that the actuator stem is
not damaged.
7. Unscrew and remove the nut (A33).
8. Remove the parts from the actuator stem
(A7) in the specified order:
− Spacer (A36)
− O-ring (A17)
− Diaphragm plate (A5)
− Diaphragm (A4)
9. Place the parts on the actuator stem in
the specified order:
− New diaphragm (A4)
− Diaphragm plate (A5)
− O-ring (A17)
− Spacer (A36)
Make sure that the seal lip of the new di-
aphragm (A4) is inserted correctly be-
tween compressor (A35) and diaphragm
plate (A5).
A33
A36
A35
A34 A7
A34
A35
A36
Servicing
A17 A5 A4
Slotted nut
Compressor
Spacer
35