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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.
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^^This^^^Originally Posted by BPTactical
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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At his age there's probably more than "back flow" going on. .^^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.
If you know what i mean.
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