Mains static pressure off the scale!!

[ShaunCorbs]

+1 to the above ive never had one rise unless faulty, as the pressure in the outgoing pipe is to what the prv is set to, so if its climbs something is wrong

 

[Barnjules]

Thanks all,very interesting. It may be faulty then. I'll get the pressure tested n take it from there

 

[chris watkins]

+2 to the above above, if they fail the pressure normally drops not rises.

What is the make / model Barnjules ? or photo would be good.

The plumber wasn't adjusting it was he to get more pressure & you have released the built-up pressure before reading the gauge ?

 

[Barnjules]

No the plumber didn't touch it. (Just tweaked a weeping comp joint on it (due to the mega pressure ha!)
It's a caleffi altecnic model prescal 533. I've just found out it only controls the dynamic,not static pressure,and max inlet pressure is 12 bar! So that may be the problem. The altecnic prescal 535 however, controls static AND dynamic (for commercial applications it says?!? And 16 bar max inlet pressure) So maybe i want one of them if my incoming mains is super high n i want static reduction.

 

[ShaunCorbs]

No the plumber didn't touch it. (Just tweaked a weeping comp joint on it (due to the mega pressure ha!)
It's a caleffi altecnic model prescal 533. I've just found out it only controls the dynamic,not static pressure,and max inlet pressure is 12 bar! So that may be the problem. The altecnic prescal 535 however, controls static AND dynamic (for commercial applications it says?!? And 16 bar max inlet pressure) So maybe i want one of them if my incoming mains is super high n i want static reduction.

i would say the 533 is not for whole house pressure reducing, tbh i only use the 535 and have no problems

 

[Barnjules]

Ah,. Cheers for that corbs. I'm def gonna change it then.

 

[chris watkins]

Always thought them to be cheap and nasty (533) but never knew they were dynamic only what a silly idea almost as bad as them pressure limiting valves they supplied with the first generation of unvented units.
Still every days a school day!!

You can't beat rwc imho
312 Compact (Cold) Pressure Reducing Valves (PRVs) | Reliance Worldwide Corporation (UK) Ltd.

 

[Barnjules]

That was very helpful chris. I like the look of them..thanks a lot for your help..and thanks to everyone else for an interesting an useful thread.

Cheers

Jules

 

[Best]

That is bizarre! This has been an education.
I hadn't an idea that the 533 valve didn't actually reduce the standing pressure on whatever it supplied. You would think "Pressure Reducing Valve" was exactly that!
I always wondered why they were so cheap and fairly small bodied and now I know! I will avoid them.
Thank goodness I never had to fit one to an unvented unit.

 

[ShaunCorbs]

That is bizarre! This has been an education.
I hadn't an idea that the 533 valve didn't actually reduce the standing pressure on whatever it supplied. You would think "Pressure Reducing Valve" was exactly that!
I always wondered why they were so cheap and fairly small bodied and now I know! I will avoid them.
Thank goodness I never had to fit one to an unvented unit.

tbh i only use them for secondary prv close to a set of sinks etc (there ok in that way )

 

[Best]

tbh i only use them for secondary prv close to a set of sinks etc (there ok in that way )

It has just occurred to me that I fitted a 533 PRV solely to my brothers outside tap a few years ago because any hose connections to power washer etc, were blowing apart with the mains pressure. Once I fitted it there has never been any problem with the pressure. Surely the static pressure should have still been same?