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An orifice is an opening made in the side or bottom of tank, having a closed perimeter, through which the fluid may be discharged.A mouthpiece is short tube fitted to a same size circular opening provided in a tank so that fluid may be discharged through it.Orifice and mouthpiece are used to measure the rate of flow of liquid.The apparatus is designed to measure the co-efficient of discharge of orifice & mouthpiece.

The apparatus consists of a supply tank, at the side of which a universal fixture for mounting orifice or mouthpiece is attached.A centrifugal pump supplied the water to supply tank. Head over the orifice/mouthpiece is controlled by a by pass valve provided at pump discharge.A measuring tank is provided to measure the discharge. A gauge for measuring X and Y co-ordinates of jet from the orifice is provided,which is used to calculate Cv of orifice.