Service Work; Replacing The Diaphragm - Samson 3372 Mounting And Operating Instructions

Service and conversion work

9.4 Service work

See Fig. 9-2 and Fig. 9-1
9.4.1 Replacing the dia-
phragm
Tip
Before dismantling the actuator, mark both
diaphragm cases (A16, A2) to ensure that
the pneumatic connections are mounted cor-
rectly later on reassembling the actuator.
a) 120 cm² version
Version with direction of action "actuator
stem extends"
1. Lift off the top diaphragm case (A16)
and remove springs (A10).
2. Pull the actuator stem (A3) together with
the diaphragm plate (A14), diaphragm
(A18) and diaphragm plate (A13) out of
the bottom diaphragm case (A2).
3. Unscrew the collar nut (A26).
4. Remove the diaphragm plate (A14), dia-
phragm (A18) and diaphragm plate
(A13) from the actuator stem (A3).
5. Place the new diaphragm on the dia-
phragm plate (A13). Place on the dia-
phragm plate (A14).
6. Check the sealing element on the collar
nut (A26). If necessary, renew it.
7. Tighten the collar nut (A26). Observe
tightening torques.
9-6
8. Apply a suitable lubricant to the actuator
stem (A3).
9. Place the actuator stem (A3) together
with the diaphragm plate (A14), dia-
phragm (A18) and diaphragm plate
(A13) in the bottom diaphragm case
(A2). Make sure that the radial shaft seal
(A2.2) is not damaged.
10. Place the springs (A10) into the bottom
diaphragm case, centering them in the
intended recesses.
11. Place on the top diaphragm case (A16).
12. Fasten the top and bottom diaphragm
cases (A16, A2) together using the nuts
(A24) and bolts (A22). Place on the
screw-on cap (A21). Observe tightening
torques.
Version with direction of action "actuator
stem retracts"
1. Lift off the top diaphragm case (A16).
2. Pull the actuator stem (A3) together with
the diaphragm plate (A14), diaphragm
(A18) and diaphragm plate (A13) out of
the bottom diaphragm case (A2).
3. Unscrew the collar nut (A26).
4. Remove the diaphragm plate (A14), dia-
phragm (A18) and diaphragm plate
(A13) from the actuator stem (A3).
5. Place the new diaphragm on the dia-
phragm plate (A13). Place on the dia-
phragm plate (A14).
6. Check the sealing element on the collar
nut (A26). If necessary, renew it.
7. Tighten the collar nut (A26). Observe
tightening torques.
EB 8313-3 EN