(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 4 of 4

Thread: Reducing Slamming of Two Check Valves on Sump Pump Discharge line

  1. #1
    DIY Junior Member bender123's Avatar
    Join Date
    Nov 2011
    Location
    Illinois
    Posts
    2

    Default Reducing Slamming of Two Check Valves on Sump Pump Discharge line

    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-...07-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. #2
    Test, Don't Guess! cacher_chick's Avatar
    Join Date
    Jan 2008
    Location
    Land of Cheese
    Posts
    3,150

    Default

    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. #3
    DIY Junior Member bender123's Avatar
    Join Date
    Nov 2011
    Location
    Illinois
    Posts
    2

    Default

    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. #4
    Test, Don't Guess! cacher_chick's Avatar
    Join Date
    Jan 2008
    Location
    Land of Cheese
    Posts
    3,150

    Default

    Yes.
    A silent check valve is a silent check valve.
    If you stack 2 check valves, you are asking for trouble.

Similar Threads

  1. Sump Pump & Discharge Line Code Requirements
    By Jimbo12 in forum Canadian Plumbing Code Questions
    Replies: 1
    Last Post: 04-20-2011, 07:31 PM
  2. Need help with slamming check valve
    By Gabe1 in forum Pumps and Tanks Well Forum & Blog
    Replies: 9
    Last Post: 03-22-2011, 05:25 PM
  3. sump pump discharge line size - is 1.5" PVC enough?
    By ct-esq in forum Pumps and Tanks Well Forum & Blog
    Replies: 0
    Last Post: 03-06-2011, 09:08 PM
  4. screw on no freeze sump discharge line
    By webomen in forum Pumps and Tanks Well Forum & Blog
    Replies: 0
    Last Post: 08-25-2010, 04:00 AM
  5. Sump Pump Line reducing question
    By average_male in forum Pumps and Tanks Well Forum & Blog
    Replies: 3
    Last Post: 09-05-2007, 09:34 PM

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •