SOMAS A11 - Single-Acting Actuator Types A24, 34, 44 - SC; Single-Acting Actuator Types A24, 34, 44 - so

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Edition: 2022-06 Original document - Mi-503 EN
Procedure
1. Disconnect internal air piping.
2. Screw the adjusting screw (
➔ Fig.5-4/13) to its outermost position.
3. Loosen the nuts (
➔ Fig.5-4/14) alternating crosswise.
Note
i
Do not unscrew the nuts completely. Make sure that the spring force is released. The end cover
has to be completely loose before removing the nuts and washers (
➔ Fig.5-3/15) completely.
Check with Somas if “tension” from the spring remains.
4. For actuator size A13-SO loosen the nuts (➔ Fig.5-4/1) in the same way.
5. Dismantle the end cover (
➔ Fig.5-4/3), cylinder tube (➔ Fig.5-4/4), tie-rods
(
➔ Fig.5-4/20) and spring kit (➔ Fig.5-4/16).
6. Unscrew the spacer (
➔ Fig.5-4/19) and dismantle the piston disc (➔ Fig.5-4/6).
7. Unscrew the screws (
➔ Fig.5-4/17). Remove the front end cover (➔ Fig.5-4/18).
Replace the piston rod seal (
➔ Fig.5-4/7) and O-ring (➔ Fig.5-4/8). Refit the
front end cover.
8. Replace the O-ring (
➔ Fig.5-4/21) in the front end cover and the O-ring
(
➔ Fig.5-4/9) on the piston rod.
9. Fit a new piston seal (
➔ Fig.5-4/10) and O-ring (➔ Fig.5-4/11) on the piston disc
and screw the entire package on the piston rod.
10. Fit a new guide ring (
➔ Fig.5-4/5) and refit the spacer.
11. Refit the spring kit and fit a new O-ring (
➔ Fig.5-4/12) in the end cover.
12. Refit the cylinder tube, tie-rods and end cover.
13. Tighten the nuts (
➔ Fig.5-4/14), alternating crosswise. Do not exceed maximum
tightening torques for tightening (
➔ Tab.4-1).
An end position adjustment should be made if the device is fitted on a valve
(
➔ Chap.4).
5.3.7 Single-acting actuator types A24, 34, 44 - SC
See “Single-acting actuator types A13, 23, 33, 43 - SC” (
➔ Chap.5.3.5).
5.3.8 Single-acting actuator types A24, 34, 44 - SO
See “Single-acting actuator types A13, 23, 33, 43 - SO” (
➔ Chap.5.3.6).