| 摘要 |
A cam valve in which a zero point adjustment of the valve is simply and easily made by finely vertically adjusting an actuator made up of a stepping motor and a cam mechanism. In the cam valve (1) of a stepping motor drive type, a stem (7) is vertically movably installed in a body (2) having an inflow path (2a), an outflow path (2b), a valve chamber (2c), and a valve seat (2d). The stem (7) is lowered by the actuator composed of the stepping motor (9) provided above the stem (7) and of the cam mechanism (10) for converting the rotational motion of the stepping motor (9) into linear motion and transmitting it to the stem (7). This causes a diaphragm (3) placed in the valve chamber (2c) or a valve body (30) placed at the lower end of the stem (7) to be in contact with the valve seat (2d). A lifting support mechanism (11) for liftably supporting the actuator is provided on a bonnet (5) covering the valve chamber (2c) of the body (2), and the lifting support mechanism (11) is provided with a fine height adjustment mechanism (12) for performing a fine adjustment of the height of the actuator relative to the stem (7).
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