Reducing Slamming of Two Check Valves on Sump Pump Discharge line

Discussion in 'Pumps and Tanks Well Forum & Blog' started by bender123, Nov 2, 2011.

  1. bender123

    bender123 New Member

    Messages:
    2
    Location:
    Illinois
    I installed a Zoeller Basement Sentry 507 battery backup pump inline with the discharge line as shown in the installation manual below. It required me to add a second check valve on the discharge line between the main pump and the backup pump.

    http://www.deanbennett.com/basement-sentry-507-install.pdf
    Page 5, figure 1..


    I then replaced the original check valve that was located about three feet above the basement floor with a Klunkless Basement Watchdog check valve to relieve the check valve slamming that was happening after the pump shut off, but this has not reduced the slamming noise.


    I guess I have a few questions:


    1. Will a "klunkless" valve stop only hammering or will it also close quietly and not "slam"?

    2. Is it possible that a "slient" valve can be rendered useless when there is a normal check valve below it? It's possible for the lower check valve to still slam shut if the upper silent valve is open a little longer duration of time?

    3. Is my only option at this point to replace the Watchdog valve with a Campbell quiet valve and see if it improves or is the physics of question 2 impossible to overcome?


    Thanks!
  2. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,281
    Location:
    Land of Cheese
    I think you read into the instructions a bit too much. You only need one check valve between the two pumps.
    The back-up pump has it's own check valve built into it.
  3. bender123

    bender123 New Member

    Messages:
    2
    Location:
    Illinois
    So, when I installed the new check valve between the two pumps I should have removed the original check valve that was above the pit?

    Do you know of anyway I can silence the check valve slamming or am I stuck at this point?
  4. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,281
    Location:
    Land of Cheese
    Yes.
    A silent check valve is a silent check valve.
    If you stack 2 check valves, you are asking for trouble.
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