Non return valve on central heating

John.G · 09-07-2020 02:01PM

You have to have the vent on the boiler flow side and because the pump is on the return you cannot put the vent on the pump suction.
Re combined Vent & cold feed, 1/2 " is the correct size for the cold feed so no problems from that end, so perhaps try that as you only have to drain the F&E tank and a few more litres more as you should be teeing in just under the tank.

zeebests · 09-07-2020 02:09PM

By teeing the feed into the vent by the f&e tank I'll effectively providing a feed to the flow and feed pipes at the stove. I understand that this will increase the resistance to escaping steam/hot water but it remains to be seen whether this will be enough to prevent pump over or too much (as you said) to prevent safe release if excess pressure. I do have the safety release valve by the cylinder as a back up I guess

zeebests · 09-07-2020 02:13PM

Putting the feed after the vent within 115mm would be simple enough but I'd still have to pull the stove out again &#55357;&#56854;

zeebests · 09-07-2020 02:13PM

Putting the feed after the vent within 115mm would be simple enough but I'd still have to pull the stove out again 😖

John.G · 09-07-2020 02:19PM

That to me, is the option to go for and while I can't promise you 100% success it is should work, otherwise there is something very strange with the set up.

zeebests · 09-07-2020 02:42PM

Is there any point in teeing the feed to the vent or should I go straight to placing the vent and feed next to each other at the stove flow?

John.G · 09-07-2020 03:41PM

I would suggest going straight to the stove flow.

zeebests · 22-07-2020 01:30PM

Thanks for your advice John. I pulled out the stove and fitted the feed next to the vent as suggested and now there is no pump over even with the fire lit and the pump on full power ��. Happy days ��

Non return valve on central heating

Comments