Do You Know How does a pneumatic control valve positioner work? Here’s Explained.

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Digital control valve positioners have started to dominate, yet you should even now know how a pneumatic control valve positioner functions. Fortunately, you just need some basic physics and little mechanical knowledge to understand it.

Just take a look.

The Pneumatic Control Valve Positioner’s Working Principle.

The pneumatic control valve positioner and its valve actuator are controlled by an air supply. There is an instrument, with a range of 3 to 15 pounds for each square inch (psi), and the air output to move the valve actuator.
In the instrument input, the air force will act on the bellows, causing it to compress or expand. The bellows connect with the beam, which measures the input from the valve stem through the cam. Likewise, it moves the flapper- nozzle system.
Computerized control valve positioners have started to dominate, yet you should in any case know how a pneumatic control valve positioner functions. Fortunately, you just need some essential material science and machine learning to comprehend this gadget.
As the beam pivots, it shifts the flapper closer to or further from the nozzle, which causes the pneumatic relay to increase or decrease the pressure on the valve actuator.
 When the valve stem moves, the rotary shaft arm makes the cam rotate, which sends feedback to the beam. That, in turn, causes the flapper to move toward or away from the nozzle, and that increases or decreases the air in the actuator through the pneumatic relay. They are working in tandem, you see? Hope you guys get the gist of pneumatic control.
This process continually adjusts the valve position based on the input signal. You can also have direct or reverse action on the valve positioner. Usually, you have the left side of the beam as the reverse action and the right side the direct action. On a side note by moving the flapper assembly, you can change this action, but you should follow the proper procedure.


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Address : J Block, Plot No-209, MIDC Bhosari, Near Shivanjali Hotel Pune-411026, Maharashtra, India.
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