Question about Watts Regulator Temperature and Pressure Relief Valve 40XL-4, 1"
On the top of the regulator is a stem/threaded rod with two nuts on it.
Loosen the bottom nut and that will allow you to turn the stem, which adjusts the pressure.
clockwise usually increases pressue, although I have encountered PRV's (Pressure Reducing Valve) that decreases pressure with a clockwise turn.
When A PRV starts malfuntioning, they often cannot be adjusted and need to be replaced or rebuilt.
Posted on Oct 03, 2009
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Posted on Jan 02, 2017
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