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 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    the-plumbing-info.jpg

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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. 

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