what is air to open and air to close control valve and
difference btwn this...and how to measure milli amp by
this...and what is the role of positioner and i/p converter in
this..plz help me
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Answer Posted / anwar mydeen
Air to open valve: the pneumatic valve will open when the
air is applied in to the actuator chamber. and the valve
will goes to close condition when u remove the pneumatic air.
In oil industry oil outlet and produced water outlet control
valves are air to open valves.
Air to Close: the pneumatic valve will close when the air is
applied in to the actuator chamber and the valve will goes
to open condition when u remove the pneumatic air.
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