NRV on a basin mixer tap?

[Daryll]

I'm planning on fitting a monobloc basin mixer tap in my new bathroom, but I'm wondering of I'll need a non-return valve on the hot supply..

The cold supply is mains fed at approx 1bar, but the hot supply will be gravity fed, at approx 0.2 bar.

Do I need to fit a NRV on the hot supply to prevent the higher pressure cold water flowing back up the hot pipe?

I know there are 2 types of mixer... single flow and dual flow, and dual flow means the hot and cold don't mix, so no danger of backflow.... the problem is that the tap I want to get doesn't say what type it is.

http://www.anybath.com/shop/taps-wastes/fairport-shaker/fairport-shaker-single-lever-673414.html

Should i fit an NRV to be on the safe side?

 

[Nige F]

Dualflow are much rarer - probably down to cost of manufacture get that valve in

 

[danhiltonplumbingservices]

i would fit one stops any problems in the future with cylinders overflowing etc.

 

[Daryll]

Thanks Guys... it will be on my next Screwfix shopping list..