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  1. TylerJett

    Adjustable vacuum release valves?

    abcmex is correct, being minus 14.7 PSI is a full vacuum. Crispin Valve has done this in the past. It is done using a vacuum relief valve with a spring sized specific for the negative pressure. Hope this helps.
  2. TylerJett

    how often do I need an air release valve

    I have to agree with BRIS, the filling of pipelines should always be done slowly & controlled. However, this isn't always the case for whatever reasons. One other site to check out is Crispin Valve. They have quite a bit of technical information I find useful.

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