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So I dropped a spirit level in an empty freshly decorated room and somehow it managed to land and the only breakable thing: the radiator TRV valve head
So I'd rather not drain the system having just done it to replace another radiator so I just want to fit a new head. I bought a complete valve but the head didn't fit, I tried every other valve head from around the house and they don't fit, the threads won't start to wind on, it seems the valve actuator sits higher above the top of the threads radiator side.
Only info on the broken head is 'en 215' which isn't very helpful
Any suggestions greatly appreciated, had enough of DIY, would like to go ride my bike!
Have you double checked the TRV you're screwing on isn't "off" ? It'll need to be fully open otherwise you'll be fighting the valve it's self as you screw it on
There is absolutely no reason to drain the system to replace a radiator valve.
You don't even need to drain the radiator. This applies to gravity fed, or pressurised systems.
I have an independent plumber's merchant near me. It's a bit pricier than B&Q but the advice is worth every penny. Take the broken bits along to one and ask.
It's a bugger replacing the whole thing. Above poster is incorrect. If I couldn't replace it I'd just control the temperature using the lockshield valve at the other end.
Yep, tried with it switched all the way off and on.
Please elaborate gears_suck, I assumed all the water from the system would pour out due to gravity.
Good shout John, there's one near me I used when doing my bathroom
It's very simple (Switch off system at spur) Cap the vent with a 22mm cap end. Push fit or otherwise. Block the feed with a bung, rag, etc. This will involve getting your hand wet in the expansion tank.
Close the lock shield and crack the nuts on the TRV side. Have the new TRV valve ready. Disengage the trv from the rad side and quickly lift off pipe. Replace imediately with new valve and tighten nuts. (You'll be using the existing ones.)
As long as your plug in the feed is good you should get minimum discharge from trv. Yes there will be some, have towels/dust sheet under work area.
Note: It's important to bleed all rads on the system before you start work. Any air in them will be under pressure and will push water out of the open end. Provided your plug and stop end are good, there will be a minimal water loss.
.....and if its a primatic cylinder, cry as it implodes and ends up looking like a crushed beer can 😀
paulosoxo - Member.....and if its a primatic cylinder, cry as it implodes and ends up looking like a crushed beer can
In the unlikely event that is the case and you have one of the few primatic cylinders still in use :roll:, call a plumber.
As you have previously drained the system, I'm betting you'd know if you did. They're more often a complete arse to refill after a drain down. Simply look for two expansion tanks in loft, or if you have a three port valve, you're good to use my method for creating a vacuum. Some say you can open more than one end, I recommend only one at a time. All you need anyway really. Proceed with caution. If you fail to make a good vacuum, you can always drain down anyway.
Tuscan If you can't get a Speed 12.