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Thread: main control valve off, bladder tank still sending water

  1. #1

    Default main control valve off, bladder tank still sending water

    have a 15 year old house i just moved into which has a standard well/bladder tank setup. i shut off the main water control valve (on the line coming in from the well) and when i turn on the faucets, i still get water (until the bladder tank empties)

    the house i just moved out of had basically the same setup, but when i turned off the main control valve, i didn't get any water out of the faucets.

    it is not the control valve leaking, because eventually the pressure at the faucet dies out and the water will stop flowing.

    what should i do to fix this? i dont want to have to drain the pressure from the bladder tank in case of an emergency leak, that doesn't seem right.

    any help would be appreciated!

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    What you have is entirely normal. The whole purpose of the bladder tank is to store water under pressure so the pump doesn't need to run with any draw. To get what you want, you'd need to either relocate the shutoff to the outlet of the tank, or add a new one there.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    That's all folks! Gary Slusser's Avatar
    Join Date
    Aug 2004
    Wherever I park the motorhome.


    Assuming a submersible pump... The valve being before the pressure tank, and probably the pressure switch is a serious no no. If you close the valve and use water, the switch sees the pressure fall to the cut in switch setting and that turns on the pump against the shut off valve, that can cause the pump to blow off drop pipe or cause other leaks and it's not good for the pump.

    The valve needs to be moved to the house side of the pressure tank unless you have a jet pump. then as Jim says, you need another valve on the house side of the pressure tank.
    Gary Slusser Retired (= out of business)
    Click Here to learn how to correctly size or program a water softener.
    CAUTION, as of Nov 12 2013 all YouTube videos showing how to rebuild a Clack valve have an error in them that can cause damage.

  4. #4
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default tank

    The purpose of the tank is to supply water between pump cycles. It is SUPPOSED to provide water until it is empty. If your previous one did not, the shut off valve was after the tank, or the tank was defective.

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