Foot valves and check valves are usually supplied with your pump
if they are considered necessary for maintaining pump prime. Both do the
same kind of job, that is to permit water to move in only one direction.
A foot valve is installed on the end of the suction pipe in the well. It keeps the suction pipe below the pump full of water while no pumping is occurring. This is important for all centrifugal and turbine-type pumps, since their efficiency is greatly reduced if they pump air.
Foot valves help piston pumps to keep operating until the suction line can be repaired if the valves are worn or there is a small leak in the suction line.
On some self-priming pumps a check valve is used on the suction line
next to the pump. It is also used where two or more pumps are supplying
water to the same delivery line to protect one pump from the pressure being
developed by the other; and where water must be held in a pressure tank.
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