Compression stop valve in gravity fed cold water pipe.

[Deighton Ridge]

In order to help future servicing am thinking of putting a compression stop valve into a cold water supply pipe feeding a gravity fed mixer shower. I have noticed that even when the valve is fully open there is a fair restriction from a 15mm diameter down to i would estimate about 8mm. Will this affect the performance of the shower due to a restricted cold water flow? I am already working with a minimum head clearance so don't want to reduce to a dribble. I have used these things before but only on a mains fed pipe.

[John]

Yes it will. You really need to put full bore gate valves in. If you don't like gatevalves you could use these

Blue Tap Red Tap

HTH

John