Non return (check) valve for garden water

[Jeremy Harris]

3 minutes ago, Nickfromwales said:

Plus every mdpe stopcock I've ever seen has had no such internal nrv. 

 

 

AFAIK, they were only ever a feature of the old brass ones that had a supposedly floating washer on the end of a sliding piston, the ones that looks like this:

 

[J1mbo]

On 16/11/2017 at 17:46, Mr Punter said:

Our local BM no longer stocks the taps with the built in check valves as he reckoned they were prone to splitting when / if they froze.  We just put the check valve inside the building.

 

Yes a very old thread but an interesting comment. I've had three of Pegler's bib tap burst in less than 12mo. They have check-valves fitted and I also have a combined isolator and double-check valve just behind them within the building.

 

They all failed the same way - popping out the little drain screw on the underside. The interesting thing here is that only one failed in the frost. Surely it will need expansion space for the heat of the sun too?

Edited June 27, 2023 by J1mbo