| 摘要 |
PROBLEM TO BE SOLVED: To improve workability in a narrow space by making an operation of opening or closing a channel of raw water and change operation of a filter body and a filter medium be smoothly executed at the same position by a method wherein a valve apparatus with integrated a check valve with a switch valve is additionally provided to a raw water inlet part of a cap. SOLUTION: A valve apparatus 5 wherein a check valve 6 for preventing raw water or filtration water from flowing back to an inlet part 2 of the raw water from inside a filter body 4 is integrated with a switch valve 7 controlling a channel of the raw water, is additionally provided to an inlet part 2 of the raw water in a cap 1. Then, in an ordinary operation, the switch valve 7 is opened to place the water of tap water or the like under the state of passing. When the filter body 4 or a filter medium 10 is changed following decease of filtering treatment capacity, and the switch valve 7 is closed by operating a handle 8 in the valve apparatus 5 to make flow in of the raw water under a stop state. Thereafter, the filter body 4 attached onto a lower surface of the cap 1 is detached, and changed with a new filter body 4 or a new filter medium 10. |
