Drayton Valves Not Operating

Plumbless · Posted: Sun Apr 23, 2006 10:28 am Post Subject: Drayton Valves Not Operating

A number of radiators remain very hot even though the Drayton TRVs are screwed down to the defrost setting. The valve's pins do not appear to be stuck and can be depressed ok. Could the valve washers be worn ? If so can they be replaced or do I need new valves ?

corgiman · Posted: Sun Apr 23, 2006 9:04 pm Post Subject:

you need a room stat

__________________
If at first you don't succeed, remove all evidence you ever tried.

Softus · Posted: Sun Apr 23, 2006 9:18 pm Post Subject:

Are the suspect TRV4 bidirectional?

If not, is it fitted on the flow to the radiator?

If so, then it's faulty and needs to be replaced to restore correct operation.

ChrisR · Posted: Mon Apr 24, 2006 1:40 am Post Subject:

Are the trv heads screwed on tight at the fixing collar?? If they're loose your rads will stay hot.

Plumbless · Posted: Mon Apr 24, 2006 7:00 am Post Subject:

The valves have an arrow indicating they are one way at the inlet. Heads have been checked as screwed on. It would appear they are not closing properly and therefore looks like I will have to replace them. Thanks very much for all your help.

ChrisR · Posted: Mon Apr 24, 2006 7:22 am Post Subject:

IN that case, nowt to lose, try inserting a small disc - a 5p or two may fit - between the head and the pin, so it's definitely pushed down. If the rad then cools you know it's the head which is faulty; if not, it's the valve itself, which I can't remember coming across.

anotherbodger · Posted: Sun May 28, 2006 4:24 pm Post Subject: TRV replacement

It must be possible to replace just the thermostatic part of the rad valve as on mine they seem to be the problem. Would they have to be the same make as the threads between the valve and head seem very similar between makes.
Of course this will depend on wether it is possible to buy just the head and of course where from.

I expect someone has asked this before but I have not found it