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Pneumatic actuator PAMS NC/NO/DA
3
Use and operating principle
The pneumatic actuator type "PAMS" enables automatic actuation of butterfly
valves.
A piston runs in a housing, its stroke movement is transmitted to a rotary move-
ments of the drive shaft.
The stroke of the piston is limited in such a way that the drive shaft does a 90°
rotation per stroke. This matches exactly the required rotational angle to open or
close the butterfly valve disc in the butterfly valve connected via a flange (figure
1).
With the actuator NC/NO, the compressed air is supplied via a drilled hole G 1/8"
in the lid. The compressed air flows in above the piston and causes the piston to
move down, the butterfly valve disc rotates. The installed springs provides the
return movement of the piston. With the actuator DA, an additional drilled hole
G1/8“ is located at the side in the lower area of the actuator. The return move-
ment of the piston is done by compressed air flowing in. Pneumatic connections
are not part of the delivery.
NC
1
/NO
2
The actuator is charged with com-
pressed air above the piston. On the
other side, air escapes through a vent-
ing hole. Reset movement is done by
spring force.
DA
3
The actuator is charged with com-
pressed air either above or below the
piston.
Changes in construction and design due to technical advance reserved.
1
normally closed (air-opened/spring-closed) (single-acting)
2
normally open (spring-opened/air-closed) (single-acting)
3
air-opened/air-closed (double acting)
