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The reciprocating pump is damaged first. The closed outlet has no bad affect to the centrifugal pump.

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Q: If the outlet valve for both centrifugal and reciprocating pump is closed which pump is damage first and why?
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If you closed the outlet valve of centrifugal pump not damage pump but why damage reciprocating pump.?

When you close the outlet valve of the centrifugal pump, you stop the flow out of the pump, which causes the measurable pressure in parts of the pump volute to go up. However, it generally can't get high enough to cause damage because all the fluid from the discharge valve back through the pump and the piping to the inlet is essentially one "body" of fluid.Reciprocating pumps are positive displacement pumps. With the outlet valve held closed, the piston extending towards it reduces the volume of the fluid trapped in the pump. Since liquids are pretty much incompressible, the pressure in the pump goes way up until something gives- the outlet valve is forced open, the piston rod fails, or the pump cylinder fails.


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