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Thread: Opening a return valve drops pressure

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    Opening a return valve drops pressure

    Thanks for all of y'alls help in the past.

    I have a problem with my pool pump that started after all the rains we have had. It struggles to maintain pressure. I followed a few posts here and played around with some of the suction and return valves.

    I see 2 areas of problem, one with the skimmer suction side and another on one return valve. When I close the skimmer suction valve, the pressure is normal. When I close on of the 2 return valves (just one, the other is fine), pressure is normal..

    Hope I am making sense here! Any help is much appreciated.

    Thanks in advance.

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    mas985's Avatar
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    Re: Opening a return valve drops pressure

    Are you saying that there is no change in pressure when you open and close valves?

    When closing a suction valve, pressure should drop. When closing a return valve, pressure should increase.

    If there is no change in pressure, it usually means that there is no flow through those lines when open. However, the change in pressure could be very subtle depending on the head loss in other parts.
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater, ThePoolCleaner

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    Re: Opening a return valve drops pressure

    Quote Originally Posted by mas985
    Are you saying that there is no change in pressure when you open and close valves?

    When closing a suction valve, pressure should drop. When closing a return valve, pressure should increase.

    If there is no change in pressure, it usually means that there is no flow through those lines when open. However, the change in pressure could be very subtle depending on the head loss in other parts.
    Thanks for your response Mark. I made no sense did I!!! Just re-read my post and realized I conveyed absolutely nothing! Sorry!

    Anyways, you clarified my question...I wanted to know what happens when you close valves on the suction and return sides.

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