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  1. 05-27-2018, 23:40 #8
    SideShow Bob
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    Quote Originally Posted by BPTactical View Post
    The drip system is low flow. It does not cause sufficient flow/differential pressure to lift the back flow poppet valve / piston completely clear of the seat. What you are hearing is "flutter" of the valve.
    As noted check downstream of the back flow preventer for restrictions.
    ^^This^^^

    Not only is Bert a hell of a gun Smiff, he is also an expert when it comes to back flow...........

    Ask him about when I hit a 4” irrigation line for the landscaping in the I-25 & Colfax interchange.
    Last edited by SideShow Bob; 05-27-2018 at 23:46.
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