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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> Bath mixer tap https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1111704288 Message started by spongebob on Mar 24^th, 2005, 10:44pm

Title: Bath mixer tap
Post by spongebob on Mar 24^th, 2005, 10:44pm

Have been asked to fit a Bristan Prism bath mixer tap. Cold water is mains fed but hot is tank fed. Instructions with the tap say to fit a non-return valve into hot supply. Is this likely to restrict the flow by a significant amount?

Title: Re: Bath mixer tap
Post by thescruff on Mar 25^th, 2005, 10:32pm

Possibly but its a water reg requirement

Wouldn't have thought the briston would work without fitting a pressure reducing valve and matching the pressures

Title: Re: Bath mixer tap
Post by spongebob on Mar 26^th, 2005, 2:20pm

Scruff....do you think that reducing the mains pressure may be the best option?

Title: Re: Bath mixer tap
Post by CWatters on Mar 26^th, 2005, 4:37pm

Confused here..

I thought non return valves were only fitted into the mains fed COLD supply to prevent stale hot water going back into the mains somehow.

Why do the regs need a valve on the hot if it's tank fed?

Title: Re: Bath mixer tap
Post by thescruff on Mar 26^th, 2005, 9:20pm

Fitting a pressure reducing valve would be the best way to go, but, you would still need the single check valves.

Cwatters,

check valve is required to stop the higher pressure (cold main) reversing up the hot, through the cylinder and flooding the loft.

Title: Re: Bath mixer tap
Post by spongebob on Mar 26^th, 2005, 10:55pm

o.k. PRV's and single check valves. Any ideas as to best source for these items?

Title: Re: Bath mixer tap
Post by thescruff on Mar 27^th, 2005, 9:26am

wrote on Mar 26^th, 2005, 10:55pm:

o.k. PRV's and single check valves. Any ideas as to best source for these items?

Pipeline, Bss, PlumbCenter

Title: Re: Bath mixer tap
Post by CWatters on Mar 27^th, 2005, 6:11pm

[quote author=thescruff check valve is required to stop the higher pressure (cold main) reversing up the hot, through the cylinder and flooding the loft.[/quote]

Thanks!