How does this pressure valve work?

dnme · 07-11-2025 07:34PM #1

Hi all,

I wanted to reduce my water pressure a little. See the attached images of my pressure valve. I am just wondering how does it work? I have tried turning the brass screw both clockwise and counter-clockwise but the pressure gauge registers no change. I have turned the screw +/- 3 turns and waited over a minute, but the gauge does absolutely nothing. What am I doing wrong?

10-10-20 · 07-11-2025 07:48PM

What water pressure are you intending on reducing, kitchen sink, bathroom, shower?

Is this on a pumped well system or what is the tank in the background of the image?

dnme · 07-11-2025 07:55PM

Think I figured it out. I had to run the taps and then adjust the pressure. Gauge works perfectly once there is flow. To answer above question, this is the water supply coming into my plant room (UV Filter, Salt Plant etc).

halkar · 07-11-2025 07:56PM

If its for heating you can reduce pressure by emptying water from one of the radiator bleed valves or any bleed valve on heating system. Looks like that filling valve is either broke, stuck or not configured properly with that high pressure reading.

Lenar3556 · 07-11-2025 08:41PM

https://www.boards.ie/discussion/comment/123970578#Comment_123970578

Not so much a need for flow, but to relieve pressure after reducing the setting - the valve has no way of doing this.

Tom44 · 08-11-2025 08:25AM

If that's for filling the central heating? It's way to high. You've a risk of blowing the pressure release valve on the boiler.

It should 1.5 bar max on the black needle.

There's an on & off tap under that valve, under the lagging.

The reason I'm rarely here anymore is that I always recommend calling a plumber 😂

Lenar3556 · 08-11-2025 09:53PM

https://www.boards.ie/discussion/comment/123971405#Comment_123971405

It’s nothing to do with central heating. It’s an inline pressure reducing valve for domestic water.

How does this pressure valve work?

Comments