Principle of pneumatic amplifiers
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It is used on control valves: one end is connected to the outlet of the positioner, and the other end is connected to the diaphragm of the control valve; air is also vented from it from time to time. What is the principle behind this device, and how does it serve to release air from the supply source?
It can be understood that the output level of the control valve and positioner corresponds to the output level of the power air.
The signal input comes from the positioner, and the output goes to the diaphragm head. The pressure of the input/output is 1:1, but the volume of air has increased by many times. To ensure rapid operation of the diaphragm valve stem, additional air supply is required. (Just like a power amplifier: the voltage remains unchanged, but the load capacity (current) increases.) The exhaust from the diaphragm head is vented through this BOOSTER.