| 摘要 |
PROBLEM TO BE SOLVED: To provide an opening indicating device of a rotary valve which recognizes full closing and/or full opening of the rotary valve without fail by a simple mechanism, does not disturb piping of the rotary valve and a subsequent operation of the rotary valve, and is easily handled. SOLUTION: In a driving device of the rotary valve, a magnet is fixed to a rotator turning in a 90°range together with a valve shaft of the rotary valve, a switch is disposed adjacently to a passage for passing the magnet on a plane extending in parallel with the rotator, and the switch senses the magnet to open or close a circuit. COPYRIGHT: (C)2003,JPO
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