Is a check valve required on the incoming water main

[joe90]

I am having to instal a new incoming water main to my build to replace the temporary one installed during the build, I have the pipe from the road into the house and about to install the stop tap but not sure if a double (or single) check valve is required, south West water site does not cover this (but does for a stand pipe).

[ProDave]

In Scotland for certain it has to be a double check valve.

 

I argued this point with the Scottish water inspector.  The single check valve in the SW supplied toby was not sufficient.  Nor was the single check valve in my own toby that followed that.  And nor was the single check valve built into the tap on my standpipe.  So to keep them happy, in addition to the THREE single check valves on place, I had to install an in line double check valve.  Only then would they make the connection.

[PeterW]

Not in current water regs as the taps and the air gaps within are supposed to meet the requirements. Installing a 28mm spring loaded check valve though in a 22mm supply pipe isn’t that difficult and tbh and change of £15 all done so becomes a bit of a no brainer.

[ToughButterCup]

Our supplier  provided a detailed drawing of all the valves and pipe work needed in our installation. You might find that your supplier has a website which details all the bits and bobs needed in your installation.

[joe90]

5 minutes ago, ToughButterCup said:

You might find that your supplier has a website which details all the bits and bobs needed in your installation.

I did look but south West water don’t mention them apart from being needed on standpipes. 🤷‍♂️