July 2020
Installation, Operation and Maintenance Manual
MAN 573 Rev. 8
Section 3: Operation and Use
3.1 Operation Description
The air pressurizes the cylinder chamber and this pressure starts the linear motion of the piston
and the consequent rotation motion of the rack and pinion mechanism, to which the valve stem is
coupled, in one direction. The operation in the opposite direction is made by the linear movement
generated from the spring releasing, when the opposition of pneumatic supply is discharged from
the cylinder.
Figure 9
For local or remote operations related to the actuator, please refer to technical documentation
furnished with actuators.
Typical schematics for various applications are follow attached for information only.
Manual Override for RPS Spring-Return Pneumatic Actuator
Actuator manual emergency operation in opposition to the spring action, is performed by rotating
the jackscrew by a handwheel (available on request) until valve completely open (or close – it depend
to actuator fail action).
Figure 10
NOTICE
The jackscrew must be completely unscrewed to allow pneumatic remote control.
Operation and Use14
Section 3: Operation and Use
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