This is probably easier than tying a shoelace for those that have done it recently or those in the industry. But I've been looking at it for a few days, looked at countless technical diagrams / dimension and images of who knows how many different TRVs and Lockshields...
1. Do any reasonable quality and priced TRVs come with a union nut connection to the tail? Why did they change, surely union was more practical?
2. If I have to replace existing old valves and union tails with new 15mm compression tails, the total distance to the rad looks to be longer by up to 10mm each side unless the supplied rad tails can be cut off say 10mm shorter than supplied reducing overall extension.
3. I must be being really stupid, but please put me out of my misery. If I install 15mm tails with compression connections to the valve, how do you ever remove the radiator without entirely draining system and removing the rad valves as the tails on each side of the rad would extend inside the valve and lock the rad in place even after loosening the compression fitting?
Please help, many thanks.
1. Do any reasonable quality and priced TRVs come with a union nut connection to the tail? Why did they change, surely union was more practical?
2. If I have to replace existing old valves and union tails with new 15mm compression tails, the total distance to the rad looks to be longer by up to 10mm each side unless the supplied rad tails can be cut off say 10mm shorter than supplied reducing overall extension.
3. I must be being really stupid, but please put me out of my misery. If I install 15mm tails with compression connections to the valve, how do you ever remove the radiator without entirely draining system and removing the rad valves as the tails on each side of the rad would extend inside the valve and lock the rad in place even after loosening the compression fitting?
Please help, many thanks.