Jim Katen Posted April 6, 2019 Report Share Posted April 6, 2019 I see this occasionally, but I've never heard a satisfactory explanation for it. Any ideas? Quote Link to comment Share on other sites More sharing options...
Chad Fabry Posted April 8, 2019 Report Share Posted April 8, 2019 It looks like water is trapped on the discharge side of the valve. As you turn the screw clockwise it increases the volume on the discharge side so the pressure decreases- as the screw turns ccw, it reduces the volume there by increasing pressure Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted April 9, 2019 Author Report Share Posted April 9, 2019 Perhaps. But why doesn't it happen with all of the bibs of this style? I test the water pressure at every house. This particular phenomenon only happens about once every year or so. Quote Link to comment Share on other sites More sharing options...
Marc Posted April 9, 2019 Report Share Posted April 9, 2019 Perhaps not every valve of that type is built the same way. Quote Link to comment Share on other sites More sharing options...
Bill Kibbel Posted April 9, 2019 Report Share Posted April 9, 2019 I'd ask Dan Bernoulli, but can't find his email address. Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted April 10, 2019 Author Report Share Posted April 10, 2019 11 hours ago, Bill Kibbel said: I'd ask Dan Bernoulli, but can't find his email address. That's cause it keeps changing, depending on how pressured you are to find it. Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted April 10, 2019 Author Report Share Posted April 10, 2019 11 hours ago, Marc said: Perhaps not every valve of that type is built the same way. Probably. I suspect that the valve seat only allows water to flow one way. To find the true pressure, you'd screw on the pressure gauge and just barely crack open the valve and wait for the pressure to build. Quote Link to comment Share on other sites More sharing options...
Marc Posted April 10, 2019 Report Share Posted April 10, 2019 Ya know, that gets me thinking...could it be that the gauge, that particular type of gauge, has a tendency to behave that way if tested with air instead of water? Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted April 10, 2019 Author Report Share Posted April 10, 2019 No, it works fine with air - I use it on frost proof bibs several times each week and they always have a slug of air at the beginning. Quote Link to comment Share on other sites More sharing options...
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