| 摘要 |
PURPOSE:To obtain high positioning accuracy by operating access to a target position from the position and target position signals of a cock and stopping the cock suddenly at the target position via motor deceleration according to a signal just before the target position. CONSTITUTION:A cock 17 is constituted from a closer 18 having a plurality of holes and a housing 19 forming a plurality of flow passages 22 continuous to each hole of a porous orifice plate 24, and flow control is made adjustable step by step via the turn of the cock 17. There are provided a position judgement unit 35 for judging a cock position upon receipt of a signal from a cock position signal generator 28, an operation control unit 36 for receiving a target position signal and a signal from the position judgement unit 35 and a speed control unit 38 and a start/stop control unit 37 for controlling a motor 32 upon receipt of a signal from the operation control unit. According to the aforesaid constitution, operation is made about access to the target position, thereby decelerating the motor 32 just before the target position and stopping the motor 32 precisely at the target position.
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