| 摘要 |
PROBLEM TO BE SOLVED: To reduce a disk closing surface so that a flow rate adjustment range can be expanded, without providing an overlap area between a safety valve operating range and the flow rate adjustment range.SOLUTION: A gas control valve 1 constituted so that the opening/closing operations of a flow rate adjustment valve 11 and a safety valve 12 are performed by a single motor 28, wherein the rotating shaft of the motor 28 is set to a position offset from an extended line of the axis of movement of an operation rod 18, the operation rod 18 is advanced forward by rotating the motor 28 in reverse, and the operation rod 18 is retracted backward by rotating the motor forward, whereby the rotational angle range of the motor 28 when the safety valve 12 is advanced forward by the operation rod 18 and the rotational angle range of the motor 28 when the safety valve 12 is retracted backward can be made to overlap, and the safety valve operating range can be narrowed to expand the flow rate adjustment range in proportion to the amount of overlap. |
