What’s the reason why an electric pressure testing pump cannot build pressure?
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The pump is a four-plunger reciprocating pump; please help, experts
Exhaust the inlet air and check for leaks in the packing.
Check if there is air inside, and verify that the check valves at the inlet and outlet are functioning properly
Photos from the scene: where is the check valve located?
As shown in the figure below, where is the check valve located?
Where is the check valve located in the drain pipe?