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valves on the return pipe line are installed due to control the surge and also suction pressure of the pump. and valve such as dampers in air flow duct are installed in order to control the amount of return air and fresh air in the mixing chamber. valves are size with the help of following equation
Cv = Q/fp*sqrt(SG/delta P)
where:
Cv= valve flow coefficient
Q= volumetric flow
Fp= piping geometry
SG= Specific gravity of liquid relative with water
Delta P= effective pressure drop across valve
