How could you determine the air pressure that is needed to open and close the valve

Field Instrumentation
1

is it possible to know the air pressure to open and close the valve

2

It is depended on FA, the force required, and the area of the actuator. You need to calculate all forces. P = FA. The area of the actuator is selected, then u need to find the total force needed. Force of spring, the force of friction, the force of flow, the force of area of the orifice