An air-operated isolation valve requires 3,600 pounds-force from its diaphragm actuator and 4 inches of stem travel for proper operation.
The valve positioner can supply up to 120 psig of air pressure to the actuator.
What is the minimum surface area of the actuator diaphragm required for proper valve operation?
A. 30 square inches
B. 60 square inches
C. 90 square inches
D. 120 square inches
Show Answer
Answer: A
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