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Thread: Should Inlet Check Valve Hold Water Overnight?

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    Join Date
    May 2015
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    Moorpark, CA
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    Should Inlet Check Valve Hold Water Overnight?

    I have a check valve on the inlet side of the main pump. When the pump starts up after sitting overnight, there is a lot of air in the system. I suspect water is back flowing through the check valve overnight. I have small leaks at the heater inlet/outlet and the booster pump inlet. I suspect air is getting in there as it backflows through the check valve.

    Should the check valve seal be good enough to prevent all water flow overnight?
    Michael

    20,000 gallon in-ground gunite/plaster pool (1992), attached spa with spillway, Pentair Superflo 1.5 HP pump, Smith booster pump for pool sweep, Pentair 2000 DE filter, Sta Rite Max-E-Therm 400 heater, Silencer Blower 2 HP for spa, Polaris 280 pool sweep.

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    Re: Should Inlet Check Valve Hold Water Overnight?

    It should be, but they go bad over time. Also, debris can get in the valves and prevent a good seal.

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    Join Date
    May 2015
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    Moorpark, CA
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    Re: Should Inlet Check Valve Hold Water Overnight?

    Thanks, James! I'll take it apart first to be sure there is no debris. If none, I'll rebuild/replace valve.

    Cheers!
    Michael

    20,000 gallon in-ground gunite/plaster pool (1992), attached spa with spillway, Pentair Superflo 1.5 HP pump, Smith booster pump for pool sweep, Pentair 2000 DE filter, Sta Rite Max-E-Therm 400 heater, Silencer Blower 2 HP for spa, Polaris 280 pool sweep.

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    Mod Squad jblizzle's Avatar
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    Re: Should Inlet Check Valve Hold Water Overnight?

    How far above your pool is the pump? Even without a check valve, the pipe should not be able to drain back to the pool unless you have an air leak somewhere.
    Jason, TFP Moderator
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    Re: Should Inlet Check Valve Hold Water Overnight?

    The poster does note that the system does have air leaks. Fixing the air leaks would help.

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