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Showing results for tags 'PRV calorifier pump'.
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Could I prevail upon the good nature of forum members to verify my logical(!) thought processes here? (In other words, what do you think). Domestic water system: new Shurflo 30psi pump fitted last year. There is an accumulator on a tee immediately downstream of the pump, and the pump has a local switch. The calorifier is vertical, and has a pressure relief valve on top piped to an overboard dump. The PRV claims to be rated at 2 bar. Calorifier and PRV may well be 15 - 20 years old. We're in a soft water area but quite a lot of crud has come through the system (rust particles) over the last several months. Problem is that the pump, on demand, pumps water quite happily, but when you would expect it to cut out, ie when the taps are closed, it slows right down but doesn't switch off. The PRV then starts a 'dagadagadagadagadaga' sort of noise as if it is trying to stay shut but can't. Twisting the knob on it either has no effect, or dumps water overboard. My diagnosis is that there may well be muck in the system, but I think the 2 bar PRV and 30psi pump are now mismatched, because the PRV should stay shut under normal system pressure. My best course of action is therefore to replace the PRV with a new one rated at 2.5 bar or even 3 bar. I don't see any reason why the calorifier couldn't withstand the increased pressure that might result. Any thoughts, please?
