For an airtoretract actuator (airtoopen/fail
closed). Apply 6.9 bar (100 psi) air pressure (or N2)
to the normal valve inlet A. Apply 0.2 bar (3.2 psi) air
signal to the actuator. Add 0.07 bar (1 psi) signal to
the actuator if the inlet pressure exceeds 6.9 bar
(100 psi). If the valve leaks, slowly turn the actuator
stem counterclockwise. This will move the plunger
(key 10) down until leakage is below 1 cc/min.