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I have a pioneer shower valve that has pressure problem

I have a pioneer shower valve that has pressure balancing. I would like hotter water but as it approaches the maximum setting (the temp adjust screw is missing)water just suddenly shuts off. I have removed the handle and plate and there are three adjustment screws on the valve itself. Any ideas?

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The way anti-scald valves work is there is a slide tube inside the faucet which requires pressure from both hot and cold or else it will cut off the flow. As for temperature adjust I do not believe there is an adjustment screw but more so there are these white plastic toothed stop rings which prevent the handle from turning 360 degrees. When your adjust the stop ring, it adjusts how much hot water is allowed to mix with the cold water. My wife likes her showers a lot hotter than I, so I gave a good allowance with the stop ring. The "adjustment screws" which you are viewing are not for adjustment of temperature, they are remote cut-off screws to stop the water entirely to change the washers in the unit if needed. SO open those all the way and leave them open. Think of them as not having to go all the way into the basement to shut off the water supply just to change a few washers.

Posted on Mar 20, 2010

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