What is this valve and why is it leaking?

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This valve is coming from one of the pipes that go directly up into my Valiant Ecotec boiler.

It is dripping water, filling that green bowl every 6 hours or so.

I assume its a pressure relief valve? But the pressure is not any higher than it always is - The boiler is working fine and pressure is 1.7bar, which is the same as always.
 

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Be very careful if you do not know what you are doing. As said it is a drain down valve. Taking it apart to replace the washer could result in a flood especially if you keep the pressure on the boiler.
 
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Be very careful if you do not know what you are doing. As said it is a drain down valve. Taking it apart to replace the washer could result in a flood especially if you keep the pressure on the boiler.

Thanks, I wouldn't attempt taking it apart - if tightening it up doesn't work I would get someone in to replace it. I'm an 'easy fix = DIY but dismantle/reassemble = call the pro's' type of guy when it comes to boilers.

But it looks like just tightening it has worked for now - no more dripping.

The boiler was serviced about 3 weeks ago so perhaps the engineer just didn't tighten it back up fully after he did what he needed to with the valve.
 
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