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If it was in the wrong way round, the valve in the middle of the diaphragm would not open to let the water flow through. Looking at the web, there doesn't seem to be any different types of diaphragm, so I was wondering if there could be air trapped in the housing stopping the hydraulic...

Hi, I have just had someone (Corgi bloke) replace the diverter valve diaphragm in my Worcester 28CDi RSF combi. The old one was shot. We get hot water now, but the problem is we need approx 6-7L/min flow before the valve operates. Max flow is only 9 or 10L/min and the spec says min flow...