Tue, 19 Dec 2023 08:37:03 +0000 http://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300538#Comment_300538 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300538#Comment_300538 Wed, 01 Mar 2023 16:20:52 +0000 WillInAberdeen
We have one that works the other way - the pin must be pushed in to allow flow, and it springs out to shut flow off. It's on a towel radiator. No markings on it.

I want to replace just the thermostatic head, but obviously most of the new ones work the normal way round. I need one that pushes the pin to allow flow.

What name or term should I be searching for, to find this kind of thermostatic head?

Thanks!]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300540#Comment_300540 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300540#Comment_300540 Wed, 01 Mar 2023 17:10:01 +0000 LF
Normal valve will be an expansion caused by temperature that is closing the valve - a fail open valve.
I think it will be a thermal bypass valve you are after - a fail closed valve/expand to open.

If you cannot find such a thing then if you made a bypass line around the radiator then a standard valve on the bypass valve would achieve your desired function ? Bypass line would link flow and return.

I am pretty sure Danfoss do something like what you want.
https://www.danfoss.com/en-gb/products/dcs/valves/thermostatic-valves/#tab-overview]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300576#Comment_300576 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300576#Comment_300576 Fri, 03 Mar 2023 10:01:19 +0000 GreenPaddy
Of all the "wonderful" things I do for clients, the greatest "magic" is to make "broken" rads work by pulling and oiling the pin, in two minutes ]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300582#Comment_300582 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300582#Comment_300582 Fri, 03 Mar 2023 14:02:23 +0000 WillInAberdeen
Hi LF, I need to replace the thermostatic head as the original was damaged by the previous owner, who replaced it with a standard head which obviously can't control the temperature as it acts in the wrong direction. I don't want to drain the system to modify pipes (airlock guaranteed!), but if I did I would replace the whole TRV.

I tried the terms you suggested (thanks!) but no luck. Danfoss do lots of normal TRVs, but their push-to-flow valves seem to be for industrial uses.

Suggestions very welcome!]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300584#Comment_300584 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300584#Comment_300584 Fri, 03 Mar 2023 14:55:16 +0000 owlman The valve internal spring keeps the valve pin closed,( pushed out), which is only opened when a manual valve head is screwed down pushing the pin in. The previous occupant has, inadvertently, fitted a standard wax capsule TRV valve head.]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300592#Comment_300592 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300592#Comment_300592 Sat, 04 Mar 2023 14:57:36 +0000 LF A radiator valve cap with epoxy packer?]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300617#Comment_300617 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300617#Comment_300617 Mon, 06 Mar 2023 09:18:14 +0000 WillInAberdeen

@LF, I can make it flow by setting the retrofit 'normal' thermostat head to "0 Frost" temperature, which pushes the pin right in and gives maximum heat. However it cannot control the temperature as it reacts in the wrong direction, so have to use the lockshield to adjust temperature so I will definitely need a new thermostatic head.

@Owlman, that's an interesting idea, I'll do some searching.]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300626#Comment_300626 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300626#Comment_300626 Mon, 06 Mar 2023 19:51:10 +0000 LF http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300628#Comment_300628 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17762&Focus=300628#Comment_300628 Mon, 06 Mar 2023 19:56:09 +0000 WillInAberdeen