Installation specifications for pump inlet and outlet pipes
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Must a check valve and a manual valve be installed at the pump outlet?
Positive displacement pumps generally don’t require check valves, right?
The question is too general; pipeline design needs to be based on the location of use, the medium, process conditions, and so on.
It is generally required; for reference only: if there is no check valve on the outlet, backflow of liquid can cause the mounting nuts of the impeller to loosen and the impeller to fall off. In the case of a mechanical seal, this may lead to wear of the seal surface and resulting leakage； Valves for import and export installation, required for pump maintenance