The rotation of the impeller creates suction at the suction pipe. As the electric motor starts rotating, it also rotates the impeller.It is a pipe whose one end is connected to the outlet of the pump and other end is connected to the required height where water is to be delivered. The strainer is used to filter the unwanted particle present in the water to prevent the centrifugal pump from blockage. The foot valve is a one way valve that opens in the upward direction. The suction pipe consists of a foot valve and strainer at its lower end. Suction Pipe with Foot Valve and StrainerĪ pipe whose one end is connected with the inlet of the impeller and the other end is dipped into the sump of water is called suction pipe. What is Positive Displacement Pump – Definition, Types and Working? In most of the cases, the casing remains concentric with the impeller. After guide vanes, water passes through the surrounding casing. The area of the guide vanes increases this helps to decrease the velocity of the liquid and increases its pressure. The design of the guide vanes are kept as such that the water which is leaving the impeller enters the guides without shock. The guide blades are mounted on a ring which is called as diffuser. Casing with Guide Blades: In this casing, the impeller is surrounded by series of guide blades. The efficiency of the vortex casing is more than that of the volute casing. This is done in order to prevent the loss of energy due to formation of eddies. Vortex Casing: In vortex casing, a circular chamber is introduced in between the impeller and casing. The volute casing is shown in figure above: The increase in area of flow decreases the velocity and increases the pressure of the liquid that flows through the casing. Volute Casing: It is a spiral type of casing in which the area of flow increases gradually.
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