How to Repair a Leaking Radiator Valve

We've all been there! Ignored the leaking radiator valve and tied some tissue round the pipe to 'fix' the problem. Eventually you are going to have to call the plumber round because you've got a flood and no heating. This usually happens on Christmas Eve!

Before you read our description on how to do it, why not watch this video first, which is transcribed below for the hard of hearing. Enjoy!


If that video didn't help you, then read on!

1. THE LOCKSHIELD IS LEAKING. There are a few different points on the lockshield radiator valve that can be leaking. All can be sealed with PTFE tape. Firslty you have two compression nuts that can be leaking. The one on the radiator side can be easily slackened off and PTFE applied to the olive. This is because you can isolate the radiator from the heating system using the lockshield valve itself and the TRV (thermostatic radiator valve). PTFE can then easily be applied to the olive underneath. This also goes for the TRV. 

If the thread on the insert is leaking, you can also now slacken that off to expose as much thread as you dare. Wind the PTFE around the thread in the same direction as you would when loosening it. Once you have applied the PTFE to the thread, rewind it in and tighten the nut and olive. Open the valves again and Test for leaks.

2. THE THERMOSTATIC RADIATOR VALVE IS LEAKING. Fixed in much the same way as the lockshield . Carry out the procsdure above.

3. THE PACKING GLAND IS LEAKING. So easy to fix! Just remove the decorative cover from the valve. You'll see a small nut underneath, remove the nut fully and wind PTFE around the shaft spindle. Pop the nut back over the top and tighten up. You should have no more leaks!

Its worth noting that throughout all these procedures, the air vent should be closed at the top. If you're not happy doing any of these tasks, then you should always get a plumber in to do it for you!