Non return valve?

[wombats]

I have just bought a Monobloc Sink Mixer Tap and have a gravity fed system. Do all mixer taps fitted with gravity fed systems need to have a non return valve on the hot pipe?

 

[kevplumb]

stops the cold main backfeeding down the hot pipe

work it out

 

[doitall]

If both supplies are from the storage tank, you don't need a NRV.

You do need to check the tap is suitable for low pressure in that case.

 

[wombats]

stops the cold main backfeeding down the hot pipe

i know what it is for, just need to know if i needed one.

If both supplies are from the storage tank, you don't need a NRV.

cold is from main sorage tank and the hot id from cylinder, is that what you mean?

You do need to check the tap is suitable for low pressure in that case

How can i find this out?

 

[doitall]

It's marked on the box normally or in the manufacturers data.

 

[wombats]

Nothing wrote on the box and can't find info from manufacturer.

Tap is this one... Vertex Monobloc

 

[wombats]

Just realised that the cold supply comes straight from the main and not the tank as i first thought and hot is from cylinder. Does this make any difference? Something tells me it might.

 

[kevplumb]

stops the cold main backfeeding down the hot pipe

work it out

yeah it might