On Sunday, 29 January 2017 13:09:46 UTC, tabby wrote:

35 year old 3 way valve had stripped its gearteeth, so the head was replaced with an identical one. Or so I thought. The new one won't work though, it stays on HW only all the time. Taking the head off reveals that the socket that engages onto the valve shaft sits at a different angle, so that at one end of the head's travel, the valve is at the other end of its travel. Hence any control of the valve is impossible, it sits at one end only. Any ideas before I copy Simon?


NT

Looks like I was wrong, the fitted valve moves a lot less angle than the replacement base that didn't get fitted. So probably full of crud & a draindown required.


NT