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OK thanks, the story's changed since I posted this morning. I've placed a container underneath the outlet from the PRV and charged the system to 1.4 Bar and as the pressure dropped over the course of the morning (to 0.8 Bar) the container began to fill up, very slowly, just a drop at a time, but...
My Glow worm Ultracom 30cxi has a problem where it will not stay pressurised, charge it up to 1.5 Bar and after several hours it's down to 0.3 Bar.
I've had the usual suspects checked out, ie the pressure relief valve, looked for leaks etc, and have had the diaphragm pumped up with air again...