I am trying to locate a 22mm compression fit non-return valve that will open with gravity/tank feed rather than mains. No-one in my local builder's merchants knew there was such a thing and if I look online, the working pressure never seems to be specified. Any suggestions welcome!
lets have a look wrote:your post isn't very clear "gravity/tank feed rather than mains" ????
Thanks for the reply.
Sorry I wasn't very clear with my explanation. The valve will be going into the hot water supply to a shower and the hot water is a gravity feed from a tank. I'm told a lot of NRV's require mains pressure to open and so wouldn't be suitable. Does that make more sense?
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