"PRV?
Pressure relief valve
A euphemism for his cock I’m assuming 
Oh right thanks for that.
From recent experience there's no bloody plumbers in Chesterfield."
I've been considering DIY but would prefer someone skilled and fully qualified  |
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By (user no longer on site)
over a year ago
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if the prv blows when system is hot it will be a perforated expansion vessel the big red thing it has a rubber diaphragm in it compressed air one side system water the other its there to take up the expansion of the heating system water when hot if the its perforated it has no way of absorbing expansion and the prv blows.
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