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Thanks Shaun,
I have put the expansion vessel, supplied as a kit in the garage, connected directly to the boiler return. It is fitted with a 4-way manifold, into which is connected, the vessel, the boiler return the blow off valve and a connection for cold fill with a ball valve.
The system is not new, so I want to keep pressures as low as possible, but I am getting some pump-over because the vent and F and E tank are now on the positive side of the pump. It's major work to change that because of the pipework layout.
I would think that once the system is full and the top-up bottle disconnected, nrv in action or gate valve closed, or the mains filling loop disconnected, that the system would not know any different.
The gate valve would be just like the combined nrv/ball valve that came with the kit, but just a nrv would give automatic top-up, like a vented system?
Just looking for any reasons why I am wrong.
What boiler you got?