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  1. #1
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    Mar 2007
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    Philadelphia PA
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    Default check valves on basement sink drains

    I have never seen a check valve on a sink drain. There a 3 of them in the basement of this newly rehabbed townhouse in Philadelphia.
    The implications are obvious, but what I want to know is, are these valves even meant for this kind of use?
    check valve.jpg

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    "There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
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  2. #2
    Join Date
    Mar 2008
    Location
    Charlotte NC
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    2,303

    Default Re: check valves on basement sink drains

    Quote Originally Posted by John Arnold View Post
    I have never seen a check valve on a sink drain. There a 3 of them in the basement of this newly rehabbed townhouse in Philadelphia.
    The implications are obvious, but what I want to know is, are these valves even meant for this kind of use?
    check valve.jpg
    That would make me wonder why "newly rehabbed". I don't know the answer to your question, but a bad experience has probably led to this solution!

    The beatings will continue until morale has improved. mgt.

  3. #3
    Join Date
    Mar 2012
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    Lansdale, PA
    Posts
    876

    Default Re: check valves on basement sink drains

    Quote Originally Posted by John Arnold View Post
    I have never seen a check valve on a sink drain. There a 3 of them in the basement of this newly rehabbed townhouse in Philadelphia.
    The implications are obvious, but what I want to know is, are these valves even meant for this kind of use?
    check valve.jpg
    Its a good question. I do not know for certain, but suspect that a typical check valve used in a sump pump discharge pipe would not be approved for this use. Besides the fact that this would be a significant obstruction in the drain piping, I think the standards for sewage backflow would be more stringent. I briefly looked on the internet for sewage backflow valves and found 1-1/2 and 2 inch models. They have an internal flapper that does not significantly obstruct flow. The link below shows the valves (see page 41). If you Google the brand and replacement flapper you can see what the flapper looks like. Maybe it is also somewhere in the catalog.

    http://www.canplasplumbing.com/Porta...s/US08_CAT.pdf


  4. #4
    Join Date
    May 2009
    Location
    Iroquois Falls, Ont. Canada
    Posts
    8

    Default Re: check valves on basement sink drains

    Quote Originally Posted by Mark Reinmiller View Post
    Its a good question. I do not know for certain, but suspect that a typical check valve used in a sump pump discharge pipe would not be approved for this use. Besides the fact that this would be a significant obstruction in the drain piping, I think the standards for sewage backflow would be more stringent. I briefly looked on the internet for sewage backflow valves and found 1-1/2 and 2 inch models. They have an internal flapper that does not significantly obstruct flow. The link below shows the valves (see page 41). If you Google the brand and replacement flapper you can see what the flapper looks like. Maybe it is also somewhere in the catalog.

    http://www.canplasplumbing.com/Porta...s/US08_CAT.pdf
    I don't see a P trap in the photo? Is this someone's idea of eliminating the trap? You need a trap.


  5. #5
    Join Date
    Mar 2012
    Location
    Lansdale, PA
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    876

    Default Re: check valves on basement sink drains

    Quote Originally Posted by Phil Cybolsky View Post
    I don't see a P trap in the photo? Is this someone's idea of eliminating the trap? You need a trap.
    I did not post the photo, but it looks like there is a trap at the right side of the photo.


  6. #6
    Join Date
    Aug 2007
    Location
    Memphis TN.
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    4,311

    Default Re: check valves on basement sink drains

    Improperly Installed & open Electrical junction box.

    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
    Billy J. Stephens HI Service Memphis TN.

  7. #7
    Join Date
    Mar 2007
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    Philadelphia PA
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    3,177

    Default Re: check valves on basement sink drains

    Quote Originally Posted by Phil Cybolsky View Post
    I don't see a P trap in the photo? Is this someone's idea of eliminating the trap? You need a trap.
    There is a trap.

    "There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
    www.ArnoldHomeInspections.com

  8. #8
    Join Date
    Mar 2007
    Location
    Spring Hill (Nashville), TN
    Posts
    5,847

    Default Re: check valves on basement sink drains

    Quote Originally Posted by Billy Stephens View Post
    Improperly Installed & open Electrical junction box.
    Yep, I would say that it is a rehab due to flooding from some source. I have seen this many times in homes that have been flooded. They install factory made cabinets that do not match the depth of the old cabinet box and the outlet box sticks out like that. If they come back and use a "pancake" or slim-fit box that usually takes care of the problem.

    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  9. #9
    Join Date
    Mar 2007
    Location
    Lake Barrington, IL
    Posts
    1,363

    Default Re: check valves on basement sink drains

    Why would you expect a check valve to function as intended when installed in the horizontal position?

    Eric Barker, ACI
    Lake Barrington, IL

  10. #10
    Join Date
    Mar 2007
    Location
    Chicago IL
    Posts
    117

    Default Re: check valves on basement sink drains

    Quote Originally Posted by Eric Barker View Post
    Why would you expect a check valve to function as intended when installed in the horizontal position?

    A lot of check valves are allowed or even required to be installed horizontally. The quote below is from a distributor's website:

    No metal parts in any of the assembled elements eliminating possibility of corrosion
    Suitable for both domestic and commercial sump pump applications
    May be installed vertically or horizontally
    Chemical-resistant PVC construction
    Easy to turn on/off handle
    PVC temperature rating: 125 psi @ 72F
    Click here to see an image of the internal workings of the Checkmate valve
    Proudly made in the USA USA flag button

    Dan Cullen
    www.domicileconsulting.com
    Chicago IL

  11. #11
    Join Date
    Sep 2013
    Location
    VA
    Posts
    4

    Default Re: check valves on basement sink drains

    Sump check valve. Probably used as a backup in case the sink in the basement isnt used much which can cause the trap to dry out.


  12. #12
    Join Date
    Jan 2011
    Location
    Utah
    Posts
    112

    Default Re: check valves on basement sink drains

    Quote Originally Posted by John Arnold View Post
    I have never seen a check valve on a sink drain. There a 3 of them in the basement of this newly rehabbed townhouse in Philadelphia.
    The implications are obvious, but what I want to know is, are these valves even meant for this kind of use?
    check valve.jpg
    My daughter owns a 4 plex rental. We recently renovated some of the units, and had a kitchen sink removed, with the drain tee exposed. When the upper apartment drained their sink, water flowed (splashed) from the tee, into the kitchen were we were working. Obviously not a swept tee. This water rush also caused gurgling in the sink, before we started the renovation. The check valve would stop the back flow from the upper level. Alternative, and preferred fix, is to replace the tee with a swept design. However, the check valve is an effective fix.


  13. #13
    Join Date
    Feb 2014
    Location
    Manitoba
    Posts
    10

    Default Re: check valves on basement sink drains

    I agree with the intent to stop waste water from backing up from the streets. It's something you don't see everyday, but if you had raw sewage coming out of your sink, putting in check valves doesn't sound so bad. I think everyone who has basement fixtures should do this.


  14. #14
    Join Date
    Nov 2007
    Location
    Chicago
    Posts
    548

    Default Re: check valves on basement sink drains

    In the OP photo the check valve is installed improperly. The flapper hinge must be set to the top, as pictured the check valve is canted at an angle, and we are not sure if the hinge is near the top, sides or bottom.

    In the picture here you can see Zoeller labeled the side that needs to be up when in the horizontal position.

    checkthisside up.jpg


  15. #15
    Join Date
    Mar 2012
    Location
    Michigan
    Posts
    43

    Default Re: check valves on basement sink drains

    Quote Originally Posted by Griffen View Post
    I agree with the intent to stop waste water from backing up from the streets. It's something you don't see everyday, but if you had raw sewage coming out of your sink, putting in check valves doesn't sound so bad. I think everyone who has basement fixtures should do this.
    Bad, so brainy smurf is into plumbing now. I would note it, due to liability.

    Everything has its beauty but not everyone sees it.

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