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That was a brilliant answer , thanks, get it now, just one thing, why would the vent flow over if they were to far apart, and the pipe goes on the feed from the f&e tank??

what the close couple is actually doing and the bypass, would it not go ok without them?

Cheers, does it just fill round it in a loop, what stops the cold feed from filling that vent pipe and overflowing? Don't understand how it prevents the system from sucking air or overflowing, maybe silly questions, hard to get my head round it just , I mean will that vent pipe only fill to the...

Trying to understand my system, what is the purpose of my 2 motor valves, throttle valve, bypass valve, open vent system with close couple, oil???

What is the purpose of the close couple H on my heating system linking the cold feed and vent? And what would happen if it was not there?