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Why is a drain valve needed above the check valve when the pump outlet pipe is vertical upward? ? ? ?
It is designed to ensure that the internal medium can be completely drained during the maintenance of the pump. With a high-quality check valve, some medium will remain between the check valve and the outlet valve.
It is mainly used for condensate drainage and venting.
After the pump is removed, the fluid above the check valve cannot flow back into the pump; this drain valve allows the fluid in this section of the pipeline to be emptied