| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of operation failure while avoiding the submergence of a flow velocity detecting mechanism, an engaging and disengaging mechanism, a turning mechanism, a torque generating source and a link mechanism even if an underground embedded valve chamber is sunken in the water. SOLUTION: In this cutoff valve, a valve rod 3 having a vertical axis Cy is extended to an upstairs chamber of an underground embedded valve chamber, and connected to a torque generating source 40 and a link mechanism 50 through an orthogonal transformation converting motive power transmitting mechanism 80. A flow speed detecting mechanism 10 is divided into a lower side flow speed detecting part 10a provided on the valve casing 1 side and an upper operating part 10B provided in the upstairs chamber, and both the parts 10A, 10B are connected to each other freely to be interlocked with each other through a pair of connecting rods 90, 90 having the vertical axis Cy.
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