Importance

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Abstract

A valve device includes a valve rod connecting a valve main body and a piston and capable of advancing and retracting in a first direction integrally with the valve main body and the piston, a rotary sleeve rotatably supported on a valve casing in a first circumferential direction around a first center axis, an operation member configured to rotate an operation shaft in a second circumferential direction, an advancing and retracting sleeve immovably fixed to the valve rod and the piston, and a stopper member configured to restrict an amount of movement of the advancing and retracting sleeve toward a first side in the first direction. The operation shaft is connected to the rotary sleeve such that a rotation of the operation shaft in the second circumferential direction can be converted into a rotation in the first circumferential direction and transmitted to the rotary sleeve. The advancing and retracting sleeve is movable in the first direction when the rotary sleeve rotates in the first circumferential direction. The stopper member is capable of coming into contact with the advancing and retracting sleeve when the advancing and retracting sleeve moves toward the first side in the first direction by a specified value.

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First Claim