Cast Iron Spring Foot Valve is used on the suction side of the pumps to avoid flow reversal from the pump to the sump in order to maintain pump priming. These also prevent the entry of foreign bodies into the pump through the suction pipe. These valves are best suitable for clear water. Cast Iron Spring Foot Valve is made from iron, carbon, and small amounts of silicone. It has impressive temperature tolerance with some cast iron capable of handling cold temperatures. The cast iron comes with a strength depending on its pressure class.