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  1. DavidScott1

    Butterfly valve leaks over time

    I have a problem with some 3 inch butterfly valves. The body is made from polypropylene, with a butterfly made of HDPE. It contains a circumferential nitrile seal. The system pumps wine up to a dynamic pressure of 80kPa. The valve is tested to 100kPa and passes. However, after approx 12...

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