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Check valve on inlet side of pump

Is it okey to install a swing or flow check at the inlet side of a pump? Does it create enough turbulence to cause cavitation? Why do we prefer to install on the outlet side of the pump?


  • Placing a restriction on the inlet of a pump

    is to be avoided.

    Significant enough restriction at the inlet of a pump may cause the pump to cavitate - by dropping the available system pressure lower than the pump's required inlet pressure.

  • hr
    hr Member Posts: 6,106
    Be careful

    with the piping and valves at pump inlets. Any devise that causes a drop in water pressure at the inlet may cause the pump to cavitate. This could include flow checks, throttling valves strainers, etc.

    Of course the location of the expansion tank is also important for the same reason.

    Low fill pressure and high operating temperatures are another thing to be careful of.

    Always nice to have 6" or more of straight pipe before the pump, also.

    hot rod

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