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Pneumatic process control valves are used in process industries to control the flow of fluid by using pneumatic actuators.
It requires 4.5 to 6 Kg/sq. cm of pressure to operate the valve.
Control room sends electrical signals of 4-20 ma to field where I/P converter converts these electrical signals into pneumatic signals.
Actuators use these signals to operate the valve.
Actuators moves the stem up and down depending upon input signals and control the valve opening.
4ma- 0% opening
8ma- 25% opening
12ma- 50% opening
16ma- 75% opening
20ma- 100% opening
What else can I help you with?
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Good question Usually motor operated valve used in big pipe lines sizes which it is need strong torque and for ON/OFF condition not to control the process, We can use rather than M.O.V pneumatic ON/OFF valve with piston actuator (Double Acting) but in this case the accessories it will cost you more because you need to provide pneumatic amplifier and big actuator depend on the pipe size. That is why better to use M.O.V the motor will rotate the gears and the gears will rotate the valve with low cost. Contact me for more clarification if there is.
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