Hmm, wonder if you can strip it and reassemble and still expect it to work (i.e. whether the pressure at which it trips is inherent in the design, or if it's dictated by how tightly some part or other is torqued upon assembly)
I suspect there's still a particle of something or other stuck in there, but disassembly might be the only way to get at it.
Alternately, the valve's probably a standard thread - if it'll come off, it's probably possible to source a 6 bar valve with the right fitting from *somewhere* even if it's not identical to the current leaking one.
Maybe something like:
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and maybe you can get fittings to make up an adapter if needed?
Dunno. This side of the Pond they're all pretty standard and you can get the valves from any DIY store that does plumbing supplies (ditto with elements, drain valves etc.) - but I don't remember seeing such things in UK stores (not that I ever had cause to look that hard, though).
Agree. This side of the pond (i.e. eastern Canada) a typical pressure relief valve costs around $25 Can or less. That's around 12 to 15 quid! (New). Last time we bought one was because the PR valve on our replacement 120 litre dual electric element hot water tank (About 150 quid, two years ago, but now closer to 180 quid) was side mounted; so a valve with a deeper thread was required. All bought from a building supplies store, of which there are several of the leading Canadian chains in this city of around 200,000. Apart from that we'd still be using a 40+ year old second hand PR we picked up in a junk store/flea market back then; for 'pennies' IIRC. One inch pipe thread I think?
I should have added that, in my experience with combi boilers, once they have been leaking the seats get irrevocably damaged and it's quick, cheap, and easy to replace them.
Sorry I misread it, I see it is adjustable up to 10 bar. We're not allowed to use adjustable ones so ours are factory set and have a lead seal, they cost considerably more too.
The only one that failed would not re seat itself no matter how I played with it once it started leaking.
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