> I would personally fit a non-return (in-line)valve which has > no water flow resistance, between the water tank supply line > and the pump, if there is room to do this. > > The reason for this is that the pump pressure switch will > then stay under pressure, providing the 'leak' is the water > returning to the fresh water tank and no a leak elsewhere. > > I am not sure that a non-return valve AFTER the pump on the > cabin side will be the answer your problem. (Food for thought?)
Of course the effectiveness will depend on whether the pump is controlled with a built in pressure switch or an external one. The external one could be after the pump. The point (which is a good one) is that the pressure switch needs to be BEYOND the non return valve (i.e. on the bit that remains pressurised). If the pressure switch is in the pump then the non return valve needs to be before the pump. Another thing that will cut down the cycling is a pressure vessel (if you don't already have one). HTH George "Bungle" Eycott
