| 摘要 |
PURPOSE:To detect an abnormal signal and prevent the malfunction of the titled device by saving the position signal generation sequence of a cock and making judgement as to whether a position signal is correct or incorrect via the operation of an estimated signal from a target position, a present position and a turning direction. 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 saving a position signal generation sequence and judging whether a position signal is correct or incorrect on the basis of a signal from a target position signal and a signal from the position judgement unit 35, and a drive control unit 37 for controlling a motor 32 according to a signal from the operation control unit 36. According to the aforesaid constitution, an abnormal signal is detected and the motor 32 is decelerated or stopped for re-inspection, thereby preventing the malfunction of the titled device.
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