Samson 3277, Mounting And Operating Instructions

Page: 37 / 48

EB 8310-5 EN 37
Servicing
3. Relieve the spring compression of actua-
tors with preloaded springs (see sec-
tion 9.3).
4. Lift off the top diaphragm case (A1).
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
jaws. Make sure that the actuator stem is
not damaged.
7. Unscrew and remove the nut (A33).
8. Take the compressor (A35) and dia-
phragm (A4) off the diaphragm plate
(A5).
9. Place the new diaphragm in the dia-
phragm plate (A5). Make sure that the
seal lip of the diaphragm (A4) is inserted
correctly between compressor (A35) and
diaphragm plate (A5).
10. Screw the compressor (A35) onto the ac-
tuator stem (A7).
11. Screw the nut (A33) against the com-
pressor (A35). On tightening against the
glued hexagon nut (with 175 cm²) or on-
to the slotted nut (with 750 cm²), use a
suitable tool to hold it stationary. Ob-
serve tightening torques. Make sure that
the diaphragm does not turn.
12. Check whether the springs (A10) rest
correctly in the bottom diaphragm case
(A2).
13. Apply a suitable lubricant to the actuator
stem (A7).
14. Place the diaphragm plate assembly con-
sisting of the actuator stem (A7), dia-
phragm plate (A5), and diaphragm (A4)
into the bottom diaphragm case (A2).
Make sure that the sealing elements are
not damaged.
15. Place on the top diaphragm case (A1).
Ensure that the compressed air connec-
tions on the cases (A1, A2) are correctly
aligned with each other.
16. If necessary, preload the springs (see
section 5.2).
17. Fasten the top and bottom diaphragm
cases (A1, A2) together using the nuts
(A21) and bolts (A20). Tighten the nuts
evenly. Observe tightening torques.
18. Mount the actuator on the valve (see sec-
tion 5.1).
7.2 Replacing the actuator
stem seals
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-