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  1. DavidScott1

    Butterfly valve leaks over time

    Thanks to all for your help. I am trying to understand the cause of the failure rather than just change to another type of valve/liner etc (due to the 12month period before I know if the change has been successful). Therefore some more info. The flowrate is 800-1000 litres/min SG's range from...
  2. 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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