The delivery valve is kept closed in order to reduce valve is opened the liquid is made to flow in an outward radial direction there by vanes of impeller at the outer circumference with high velocity at outer circumference due to centrifugal action vacuum is created. The necessity of priming of a centrifugal pump is due to the fact that the pressure generated at the centrifugal pump impeller is directly proportional to density of fluid that is in contact with it.ДЄfter the pump is primed the delivery valve is still kept closed and electric motor is started to rotate the impeller. Priming is the operation in which suction pipe casing of the pump and the position of fluid with the liquid which is to be pumped so that all the air from the position of pump is driven out and no air is left. The first step in the operation of a centrifugal pump is priming. The strainer is used to filter the unwanted particle present in the water to prevent the centrifugal pump from blockage. At the water end, it consists of foot value and strainer.В The foot valve is a one way valve that opens in the upward direction. Suction pipe is connected with the inlet of the impeller and the other end is dipped into the sump of water. Suction Pipe with Foot Valve and Strainer Near the outlet of the pump on the delivery pipe, a valve is provided which controls the flow from the pump into delivery pipe.Д¤. It is a pipe which is connected at its lower end to the out let of the pump and it delivers the liquid to the required height. Fig 3: Main Components of Centrifugal Pump.Д¬ommonly three types of casing are used in centrifugal pump,

Centrifugal pumps water