| 摘要 |
PURPOSE:To enable water washing to be performed more completely, by constituting passages such that a predetermined regenerating operation is performed only at a one-way travel in each reciprocating movement of a main piston, and that in quick water-washing cycle, the cleaning water flows through an ion exchange resin layer from its top to its bottom. CONSTITUTION:The inlet and outlet passages which are opened or closed, or connected or disconnected, by means of a main piston 6 are formed by arranging a treated water outlet 16, an original water inlet 17, a passageway 18 leading to a treating vessel, a drainage opening 19, and another passage-way 20 leading to the treating vessel, in this order along the piston 6 in the direction of the axis of the piston. Further, the constitution of the passages is made such that a predetermined regeneration operation is performed only at a one-way travel in each reciprocating movement of the piston 6, and that in a quick water-washing cycle, the cleaning water flows through an ion exchange resin layer 22 from its top to its bottom. As a result, more complete water washing can be performed as compared with conventional apparatuses. Further, an outflow of incompletely-treated water, which has occasionally happened in the beginning of a water-passing cycle, can be prevented. |
