PROBLEM TO BE SOLVED: To provide a valve which is simply and compactly designed, and can be easily maintained, and can bear even a high-pressure load, and can arbitrarily operate on both sides.;SOLUTION: The valve is composed of a valve housing 1 which has a first opening portion 3 and a first wall 2 having a first valve seat 4, a valve disk 5 which has a closing side 6 having a sealing ring 7, and at least one driving portion 8. The valve disk 5 can turn or traverse. The normal distance between the valve disk 5 and the first valve seat 4 can be reduced, and a passage can be air-tightly sealed. The valve disk 5 comprises an outer disk 9 which is connected to the driving portion 8 and fixes the sealing ring 7 to the first valve seat 4 in the normal direction, and an inner disk 10 which has an outer peripheral zone 11 and can move relative to the outer disk 9 in the direction normal to the first valve seat 4.;COPYRIGHT: (C)2007,JPO&INPIT
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