Show pumps soft or hard water in domestic domestIci water vater supply systems it has been necessary to have two pumps one for the hard water well and the other for the soft water cistern now this service can be supplied automatically with one pump fitted with a patented double acting valve says say a writer in popular mechanics magazine tills this valve la Is cylindrical in form and has six openings two to the inlet and outlet open ings of the pump two to the liard hard and soft water gatei discharges ind and the two for the suction pipes to the hard and soft water supplies in the barrel bariel of the cylinder are three pistons made to move one way orabe orthe other a accord C com ing to the hie direction of the greater pressure and to close automatically the ports so that flint when water Is drawn from a soft water faucet the hard water ports are closed and vice versa |