CAM VALVE

摘要

An actuator composed of a step motor and a cam mechanism is finely adjusted vertically so as to perform zero-point adjustment of a valve easily and readily. In a step motor driven cam valve 1 a stem 7 is disposed to freely ascend and descend within a body 2 having an in-low passage 2a, an out-flow passage 2b, a valve chamber 2c, and a valve seat 2d. The stem 7 is descended by an actuator disposed at a position above the stem 7 and composed of a step motor 9 and a cam mechanism 10 that changes a rotational motion of the step motor 9 to a linear motion and transmits the linear motion to the stem 7. A diaphragm 3 disposed within a valve chamber 2c or a valve body 30 arranged at a lower end part of the stem 7 rests on the valve seat 2d. A lift support mechanism 11 that supports the actuator to freely ascend and descend is arranged at a bonnet 5 that covers the valve chamber 2c of the body 2. A height fine-adjustment mechanism 12 finely adjusts the height of the actuator relative to the stem 7 and is arranged at the lift supporting mechanism 11.