Expert’s answer :Where do you apply volume boosters?

When the signal from a valve positioner, controller, or any other device doesn’t have enough strength to work the control valves, you need to apply a volume booster to amplify the signal.

When you have valve actuators that need a lot of volume to get the right stroke, then you’ll probably need a volume booster. But remember that volume boosters can affect the gain of smart valve positioners when you tune the control loop. You need to control that to get peak performance.


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Pneumatic volume boosters have a pneumatic supply, an input signal, and an output signal. The input signal applies force on one side of a diaphragm and the output signal applies force on the other.  It makes the diaphragm move to change the output signal, and the valve position balances again.

The output of the pneumatic volume booster can work differently, so keep that in mind when shopping.  It can provide a output proportional to the input signal, multiply the input signal for two, or offer a fraction of the input signal.

In general, applying a volume booster will improve the stroke speed of the valve. So you’ll get a proper response from the valve to keep the process at the setpoint.

You can watch this video to get more information about pneumatic volume boosters:

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