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Pneumatic Actuator-Spring Return (Fail Safe)

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pneumatic actuator-spring return (fail safe)
The operating principle of single acting spring return actuator

Sizing example of HAITIMA spring return actuator:
Spring to close when air fails (air to open):
Valve torque 60N.m plus 30% safety factor=78N.m. Minimum
operating pressure:6bar. The spring return HAITIMA actuator
selected is HTS-125-10. The HTS-125-10 has the following output
torques:
1.air torque 0°(valve close)=173N.m > 78N.m
2.air torque 90°(valve open)=118N.m>78N.m
3.spring torque 90°(valve open)=156N.m > 78N.m
4.spring torque 0°(valve close)=119N.m > 78N.m

CCW-counter-clockwise
CCW-counter-clockwise

Air to port A forces the pistons outwards, causing the springs to compress. The pinion turns counter-clockwise while air is being exhausted through port B.
CW-clockwise
CW-clockwise

Loss of air pressure through port A allows the stored energy in the
springs to force the pistons inwards. The pinion turns clockwise
while air is being exchausted through port A.

    
Mounting Variations Spring Arrangement
CCW-counter-clockwise
ccw-counter-clockwise

CW-clockwise
CW-clockwise
spring arrangement