| 摘要 |
PROBLEM TO BE SOLVED: To provide a flow passage switching apparatus which can improve its durability by reducing its operation resistance in switching a flow passage while reducing its size. SOLUTION: The flow passage switching apparatus comprises an inlet port and a plurality of outlet ports 3 in a valve chamber 1, a valve seat 4, and a valve body 5 which is located inside the valve chamber 1 in the retractable manner to the valve seat 4 in each of a plurality of the outlet ports 3. Further, the apparatus has an elastic energizing means 8 for elastically energizing each valve body 5 toward each outlet port 3 so as to come into close contact with each valve seat 4; a plurality of pushing members 10 held in each outlet side flow passage 9 continued to each outlet port 3 so as to move to a valve body pushing position, where each valve body 5 can separate from each valve seat by pushing each valve body 5, and a valve body no-pushing position, where each valve body 5 is not pushed; and a movement operating means 100 for alternatively moving a plurality of pushing members 10 to the valve body pushing position, such that each valve body 5 alternatively separates from each valve seat 4 against the elastic energizing force of the elastic energizing means 8. COPYRIGHT: (C)2005,JPO&NCIPI
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