Principles for installing the pump outlet check valve
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Principles for installing check valves at the pump outlet. Check valves need to be installed in the following situations: (1) Pumps whose structure does not allow reverse rotation. (2) Centrifugal pumps with a head of ≥25m. (3) Pumps in which it is not permissible from a process perspective for the medium to flow back to the suction side of the pump. Check valves may not be required in the following situations: (1) Transfer pumps for media containing solid particles or substances that tend to crystallize. (2) Pumps equipped with a foot valve on the suction side. (3) The pump itself has no restriction on reverse operation, and the head
Another scenario is when there are two pumps, one in operation and one as a backup; check valves are also needed in this case. If the inlet valve is not sealed properly, it may prevent maintenance of the pump
Why is the head limit set at 25 meters?
One or more check valves must be installed at the outlet of a pump to prevent the medium from flowing back when the pump stops operating.
My friends, is there any regulatory framework or standard that underpins this rule?
Check valves should be used with caution, as they can cause a significant pressure drop. They are generally used in situations where there is high pressure at the outlet, when backflow may occur during shutdown, or in conditions prone to water hammer effects