I am about to install a new mixer tap to a small basin in a small cloakroom. The tap comes with flexible hot & cold "pipes". As the cold supply is mains, non return valves are required by the regs, but I also want isolation valves for future convenient maintenance. As there isn't much room, I was wondering if you can buy a non return valve with a built in isolator. I haven't been able to find such a thing on the internet. Any other suggestions? Thanks.
And you find them installed backwards, sometimes. Nearby house had several dribbling service valves, because the water pressure was lifting the ball off the seat.
The non-return valve can a few feet back along the supply pipe - as long as the pipe it's in serves *only* that tap.
Get isolator valves with a decent handle, like this: [1]
Thanks for your advice, guys. It has been really useful and I have sorted out in my head what I will do!
Depends if those are decent handles or not :) Some makes have the handles made of plastic that disintegrates when they have been left a few years without been moved.
True. That usually leaves a metal lug which you can turn with a pair of pliers, though. But when the type with a recessed screw gives up, you're stuffed!
I've found the odd one (on my boiler) that has sheared the shaft so just as bad as a recessed screw type.
I've recently used Pegler full bore ones with handles, no failures yet, but too soon to tell.
One advantage of handles is you can easily exercise them without a screwdriver, ensuring that they will work when needed. The ones in the airing cupboard get done, the ones above the boiler need steps so don't get done -- I must do so!
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