New pressure reducing valve

[Fallout]

It is reducing pressure when a tap is used. But just shooting up to main pressure when nothing in use

 

[Johntheo5]

Yes, understood, but try and get a handle on just how much its leaking past by doing the above test, just keep opening any tap very very gradually until the pressure just stops falling, it should be ~ 3.0bar or possibly slightly higher, doesn't really matter, take a photo then of the water flowing/dripping from the tap and post it.

 

[Fallout]

Thanks I'll have a go. I know it says preset to 3 bar so thought it would stop at 3 when turn the mains back on. But it just carried on rising quickly to max full mains pressure

 

[denso13]

But it just carried on rising quickly to max full mains pressure

That's not right, contact Reliance for advice or replace the valve.

 

[Fallout]

Thanks I'll contact them. If I got a new valve would replacing the just the head gear be an option?

 

[denso13]

Possibly, looks easier to change the whole thing though.

 

[Fallout]

Thanks I'll have a look it's just the pipework is tight.

 

[Johntheo5]

I wouldn't, under any circumstances, mix old with new.

Are you sure that there is other mains supply to showers or a unvented cylinder etc and that this PRV is the only source?

 

[Fallout]

Yes there is no other mains so won't be back pressuring.

You wouldn't attempt swapping just the head of the valve?

 

[Fallout]

I need to find out for definite that it's ment to be drop tight