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Motorised valves restrict flow

Postby billandben » Thu Oct 09, 2008 4:42 pm

I've just bought a 22mm Drayton 2-port motorised valve and noticed that although the inlet is 22mm, the outlet seems to be restricted to about 15mm, thereby halving the throughput. This seems to be a bad design. Can anyone recommend a 2-port valve that actually has a full 22mm bore
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Simply Build It

Postby plumbbob » Fri Oct 10, 2008 7:54 pm

Honeywell do a two port zone valve which if I remember right is full bore.

I prefer them anyway.

Screwfix part no 31480
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