| 摘要 |
PURPOSE:To make the manual on-off operation of a valve body performable in an easy manner, by installing a cam body which engages a driving shaft at an interval from a zero position to a 180 deg. rotating position and disengages itself from the driving shaft at the 180 deg. rotating position, in relation to the driving shaft connected by a manual lever and opening or closing the valve body. CONSTITUTION:In an illustrated sate that a valve body 5 is situated in a full- close position, when a circuit-making switch S1 is turned on, a geared motor M is rotated by a control unit 11, and a cam body 8 is rotated clockwise. With this rotation, a cam follower 6b is pushed upward, and the valve body 5 moves inside a riser pipe 2 via the driving shaft 3, opening a flow passage of a pipe line 1. At this time, the cam body 8 further rotates beyond a top dead center position, the driving shaft 3 stops its movement whereby the valve body keeps a state of being half opened. And, when the cam body 8 reaches a position where it rotates as far as 180 deg. from a zero position, a switch SW2 is pushed in motion, and the motor M is stopped. When the cam body is further turned round at a fixed angle, it engages the cam follower, depressing the driving shaft down to a bottom dead center, but if going beyond the bottom dead center, the engagement is released free. |
