22mm Low pressure Check / non return valve, shower pump problem

[Jones82]

Hi

Anyone know where you can get a 22mm low pressure non-return valve, it was suggested by Grundfos to combat the pump turning on when a hot tap is used...

I've already put a U in the pipework coming off the essex boss.

The pipe work is a little strange, it comes off the top of the cylinder, the feed to the hot taps goes up to the loft, vents, runs across the loft 6m then drops down to feed the rest of the house. The shower supply is separate to this, being feed from an essex boss on the cylinder.

I'm thinking of fitting the non-return on the supply to the pump... actually wouldn't it better on the hot supply to the taps?

Thanks

 

[tamz]

CHECK & RELIEF VALVES, STRAINERS & DRAIN COCKS

 

[Jones82]

Excellent, thank you