Radiator lockshield valve

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Leoki

Good morning

I replaced a leaking lockshield valve yesterday, the new valve fitted onto the pipework without needing to make any alterations. The valve came with a new radiator tail but the original tail still in the radiator does mate with the new valve so i have initially connected the two. I have noticed after tightening the nut of the original tail onto the new valve that it tightens so far you can not see any of the thread on the valve. I am not sure whether this is okay or whether i should use the new tail. Checking other lockshield valves around the house you can see at least one if not two threads are visible.

The radiator has not been filled, there is a seperate issue with the radiator brackets being loose which i need to address first.

The fact all of the thread is used up on the valve connection, will i get a good seal/joint ?

I hope this makes sense. 😀
 
In my experience as long as the connections are not forced and everything is lined up, it will be just fine.
 
Are you talking about a Belmont / Cosmos type tail (which has a dome mating to the valve and a loose 3/4" nut) or a Pegler type tail which is a 15mm tube and standard compression nut and olive?

One thing you've got to watch is that the old Pegler tails had a different pitch thread on the nuts than the modern compression threads.

My merchant for oil fittings seems to delight in sending fittings with multiple type threads on the 10mm compression fittings. What a pain if you come to alter anything!
 
The cap from the old lockshield valve has peglers/belmont on it. The tail has the dome mating and loose 3/4 nut. The loose nut on the original tail seems to turn on the thread of the new valve with no undue force needed. My only concern/observation is that the loose nut on the tail tightens onto the new valve to the point you come to the end of the threads on the new valve and i am not sure if this means there is not a tight enough contact between the dome mating and the new valve.
 
Why not fit the radiator then open the valve for a few seconds and close the valve again and check for leaks? You don't have to fill the whole heating system then find out!!
 
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