11
R
e
v
.2
/
01
.0
7
.2
0
1
6
Pneumatic actuator PAMS NC/NO/DA
11 Faults, possible causes, remedy
Table 6: Faults, possible causes, remedy
Fault
Possible causes
Remedy
Air leak at the connections
Pneumatic hoses not cut to fit
at right angle
Cut the pneumatic hoses at
right angles.
Plug connection defective.
Replace plug connection.
O-ring at plug connection
missing.
Mount O-ring.
Max. permitted operating
pressure exceeded.
Reduce operating pressure.
Air leak at the piston gasket.
Piston gasket worn.
Replace actuator.
Butterfly valve does not open
or close.
Air pressure too low.
Increase air pressure.
Foreign body between butter-
fly valve and gasket
Dismount butterfly valve and
remove foreign body
Square at the disc twisted
Replace disc
Piston gasket worn.
Replace actuator.
Disc does not remain is set
position.
Air pressure too low.
Increase air pressure.
Air leak at actuator and/or
pneumatic connections.
Perform suitable measures
depending on the leak.
Actuator gets loose from the
bracket.
Special screws become un-
done.
Tighten screws with 3Nm.
