Smallest check valve that can be fitted between 1/2'" connectors

[rarara]

I have a shower mixer that is connected to the hot and cold supply which are both 1/2" male fittings by way of flexi-hoses. Hopefully this explains better that I can:

Untitled

• rarara
• 26 Feb 2015

Problem being is that when it is left open it allows the hot and cold to mix. I therefore want to add a check valve to the hot supply. Is there a very compact 1/2"Female-to-1/2"Male valve that I can put between the existing connectors? Obviously it needs to be as small as possible to allow the casing to be mounted back on the wall when connected.

Thanks

 

[rarara]

would this work?: http://www.screwfix.com/p/non-return-shower-check-valve/71542

is it 1/2" male on one side and female on the other?

 

[Madrab]

Do you have mains cold and cylinder fed hot water? Mixer showers should be fed from balanced H&C supplies to avoid this very issue. Most showers have integral NRV's these days.

 

[rarara]

yes, thats correct - standard cold supply and hot from the boiler. i think the mixer itself is just missing any kind of check valve. not an issue as long as we turn off both handles after using the shower, otherwise the hot tap can be a bit cooler than usual