| 摘要 |
PURPOSE:To provide a valve opening detecting device which enables setting of detection of plural required openings with high reliability in prevention of a detecting opening from limitation of a space, by a method wherein a varying shaft, being capable of varying and setting a single detector to 0-100% opening, and a driving part, driving the varying shaft, are located in parallel to a valve rod lift. CONSTITUTION:In a valve device which comprises a valve rod 2, coupled to a valve 1, and a driving mechanism 3 which drives the valve through the valve rod 2, a valve opening detector 4, situated in the arbitrary position of the valve rod 2, and a varying shaft 5, formed such that it is located parallel to the valve rod 2 and is rotatable, are provided. An engaging part 6 is provided so that the valve opening detector 4 can be engaged with the varying shaft 5, and rotation of the varying shaft 5 enables variation of the position of the engaging part 6. |
