CONSTRUCTION
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The pneumatic control system is main consists of a flapper and nozzle.
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The orific plate of 0.25 mm diameter is placed in the nozzle.
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The flapper has two ends, one end is fixed, and another end is movable.
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There is placed to the control valve in the nozzle.
WORKING
If the flapper moves towards the nozzle, then the input is increased. The air supply is given to the nozzle through the orific plate. since, the flapper is moves towards the nozzle, there is a restriction to the air, due to which the output is increased by reaches near the set point value.
If the flapper moves away from the nozzle, the input is decreased . The air supply is given to the nozzle through the orific plate. since, the flapper is moves away from the nozzle, there no any restriction to the air, due to which the output is decreased and comes near the set point value.
Author: Laxmi Omprakash Singh