| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-cost air-operated valve. SOLUTION: In the air-operated valve 1, pistons 23, 24 are allowed to slide in a cylinder by pressure of operation-air supplied to an operation part 85 to impart a driving force to a valve part 2. In the structure of the piston, a first piston rod 42 and a second piston rod 52 are faced each other in the reverse direction across piston parts 41, 51. In the state of the valve normally closed, the first piston rod 42 makes advance/retreat to/from the valve part 2, and in the state of the valve normally open, the second piston rod 52 makes advance/retreat to/from the valve 2. COPYRIGHT: (C)2008,JPO&INPIT
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