I have this valve which we use on the boiler to increase the pressure but it has just started leaking and is dripping through our ceiling.

Can anyone suggest what I need to do to stop the leak? enter image description here enter image description here

  • Where is it leaking? There are 2 threaded compression fittings to copper, 1 threaded washer fitting to the braided hose, and the valve itself. Depending upon which of these 4 potential leaks you have, the answer would be different. – Ray Butterworth Sep 28 '19 at 0:40
  • It is leaking from the black valve – AWGIS Sep 29 '19 at 13:57
  • 1
    If it is the valve itself that's leaking, I'd simply replace the entire thing with a new one. – Ray Butterworth Sep 29 '19 at 15:02

Would need to know more about the design of the system. I'm assuming I'm seeing plastic piping which leads me to believe that this is a fresh water take-off from a heating system (boiler). Plastic and metal do not live well together, and any fittings should be of the same type. Some may argue that the Shark-Bite and related connectors work well, and they do in certain situation for which they were designed.

I would suggest replacing all the plastic pipe with copper coming from the boiler until you get to the hot water house piping. Then the copper-to-plastic (CPVC) fitting(s) should be manufactured for that specific transition. The heating and cooling of the two materials expand and contract at different rates and is most likely the cause of the leak, as the plastic has probably deformed at the point of clamping by the valve.

  • Thanks @Mastedon, I had a look and they are actually copper piping which has been painted with a number of coats of paint. – AWGIS Oct 29 '18 at 8:42

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.