An air-operated isolation valve requires 3,600 pounds-force applied to the top of the actuator diaphragm to open.
The actuator diaphragm has a diameter of 9 inches and the valve stem travels 3 inches from fully open to fully closed.
If control air pressure to the valve actuator begins to increase from 0 psig, which one of the following is the approximate air pressure at which the valve will begin to open?
A. 14 psig
B. 57 psig
C. 81 psig
D. 127 psig
Show Answer
Answer: B
Share your understanding of this question with the correct explanation.