A foot valve is basically a check valve  fitted to the end of the suction pipe leading to the pump. Its purpose is to keep fluid trapped in the suction pipe when the pump stops. Thus, maintaining a suitable prime for the pump. When the pump restarts, The suction created opens the valve, giving full flow to the pump inlet.it is used to maintain hydraulic pressure within the pipeline to keep the water flow in accordance with given setting. It comes with strainer used to remove residues which may block the smooth flow fluid inside the valve.