Maximum water pressure?

[davebullock]

Hi guys,

Can anyone tell me if there is a maximum cold water supply pressure for domestic and / or commercial premises please?

We have an electric water heater below our works kitchen sink which is protected by a 6 Bar PRV.
Having worked for years suddenly the PRV began 'venting to waste' so I checked the type, fitting and pressure marking with a view to replacing it.
It was marked 6 Bar and so I bought a direct replacement and fitted it.
After fitting I immediately noticed that when using the cold water tap on the sink, whenever I closed the tap, the PRV would vent momentarily.
After only one week the valve is venting to waste again. ( and maybe wasting water at night when the demand is low?)
I have actually now tried two new PRV's and both suffer the same problem.
So.....
As I can't find a PRV with a higher rating, and that the heater may have to be limited to 6 Bar can anyone tell me:-

1). Is there a maximum water pressure that the supplier has to abide by?

2). Are City centre (Nottingham) commercial premises supplied at a higher pressure and maybe have some sort of pressure reduction valve (a bit like a gas main regulator) that might have gone faulty?

Expert advice please.
Thanks
Dave

 

[chris watkins]

Can I suggest that dave almost spelt his own name correctly or perhaps he should have gone for the big one in the middle which would have been much more apt !!

 

[SafeGasInstall]

When you all come here and dont hear what you want to hear then WE are no good , or we dont know our job or we have been sarcastic .....
Did you ask your self first and took 5min of your time why did you get this sort of response to your questions ?????I am sure you did not .....

 

[Dotty]

Thanks for the advice Croppie.
I'll send for a rocket scientist then instead of sarcastic plumbers who think they know it all eh?
Thankyou to all the respondents who offered sensible advice
This thread is now closed.
Dave

You don't have the power.

I do. And I'm not going to.

You come on here, telling us it's not rocket science sorting out the problem yet can't yourself, then when you're given advice you refuse to accept we're being sarcastic?

You deserve everything that's coming to you pal!

 

[justlead1]

Most City centres have fluctuating mains water pressure when measured over 24 hours and 7 days owing to usage. (High population during working days) When large quantities are used the system pressure will be lower in the area (Hydraulic graidiant), however say Saturday evening and Sunday low usage higher pressure. Simple PRV's reduce pressure by a percentage of upstream pressure. On occasions two inline could be used when one will not reduce enough. But they work with washers just like taps so wear and bits of debris are the threat. If you are wasting water from a pressure relief valve and on a meter it could work out costly?
A pressure increase may also be work by utilities replacing leaking mains systems. If it persists perhaps its time to seek an alternative unit that is not reliant on pressure reduction. Good Luck

 

[mutley racers]

Most City centres have fluctuating mains water pressure when measured over 24 hours and 7 days owing to usage. (High population during working days) When large quantities are used the system pressure will be lower in the area (Hydraulic graidiant), however say Saturday evening and Sunday low usage higher pressure. Simple PRV's reduce pressure by a percentage of upstream pressure. On occasions two inline could be used when one will not reduce enough. But they work with washers just like taps so wear and bits of debris are the threat. If you are wasting water from a pressure relief valve and on a meter it could work out costly?
A pressure increase may also be work by utilities replacing leaking mains systems. If it persists perhaps its time to seek an alternative unit that is not reliant on pressure reduction. Good Luck

Justlead+1, are you the justlead of long ago?