what is differences between singal acting and double action valve

what is differences between singal acting and double action
valve

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Carlo Gavazzi, Welspun, I also Faced
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what is differences between singal acting and double action valve..

Single Acting means, in one direction,(Open or close) the
valve will move with signal and other direction will move
with spring force.
Double Acting means, valve will move (Open or close) in
both directions with signals.
aftabmazari@yahoo.com

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