I've been puzzling over this since the thread started, so today when I had to go into my forelocker for something else I had a look at my accumulator while I was there.
Mine does not have a diaphragm, and is not adjustable. It is just a steel flask, containing (mostly) air. It is mounted with the connection for the pipe from the water system at the bottom. The air's compressability is what enables the pressure accumulation. This is exactly the same as, but much smaller than, one that was in a house I owned. I have heard of one on a boat which was simply a champagne bottle (sans champagne, of course). It worked fine. Why would a more complex (i.e. adjustable) one be needed? Adrian . Adrian Stott 07956-299966
