Question about flow through a ball valve...

Discussion in 'Water Features' started by DarkLotus, Oct 17, 2009.

  1. DarkLotus

    DarkLotus LawnSite Member
    from Florida
    Messages: 82

    I also posted this in the irrigation forums, but I wanted to hear it from you as well.

    I sell pvc ball valves, check valves, unions and a bunch of other items.

    I just had a buyer complain that my 4" PVC Ball Valves are not full port as advertised. I pulled out my calipers and sure it enough, it measured 3 3/4" in the throat, not 4".

    Is there that much flow loss in that 1/4"? I have never noticed it in either irrigation nor pond installs. Has anyone ever seen a 4" PVC Ball Valve that was truly 4" inside?


  2. STL Ponds and Waterfalls

    STL Ponds and Waterfalls LawnSite Bronze Member
    Messages: 1,174

    I never thought twice about them. I usually just installed them and went on with the rest of the job. I guess I need to do some checking on the valves I use.:confused:
  3. XStream Aquatics

    XStream Aquatics LawnSite Member
    Messages: 239

    There is alot of loss in the 1/4"!!!!!!!!!!!!!!!!!!!!!!!!!
  4. XStream Aquatics

    XStream Aquatics LawnSite Member
    Messages: 239

    I will post a chart of friction loss and head on fittings when I get back in town.

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