Check valves and mixer taps

[swingthelead]

I noticed that the mixer tap was making the sound of running water when the main valve was open but the tap and the spray attachment was closed. I theorised that cold water was running into the hot pipe, as it is much higher pressure. I went online and concluded that the solution was a check valve.

I bought one, fitted it ... and I still get the sound.

Is it the cold supply going into the hot pipes? If not, what is it - and if so, why didn't the check valve stop and what should I do?

Thanks for reading.

 

[Welder]

Pictures pls

 

[swingthelead]

Pictures of what?

 

[Welder]

The tap, the pipework & the check valve in situ.

 

[swingthelead]

Can't manage that right now.
If it helps, this is the tap:
this is the check valve
and it's fitted 3 inches or so below the tap tail on Hep2O 15mm pipe running about 12" from a connector with the old copper pipe.

 

[Harvest Fields]

Nope we need to see it in situ.

 

[swingthelead]

I'll try to sort it out for tomorrow evening.

 

[Burger]

Judging by the tap, being the kitchen sink it could be a burst water main. Turn your stopcock off and see if it still make the noise but only louder, this should confirm a burst. If not did you fit the check valve on the hot?

 

[Riley]

Well the way to be sure is turn off your internal stopcock and see if your water meter still turns

 

[Burger]

Well the way to be sure is turn off your internal stopcock and see if your water meter still turns

If there is a meter