| CPC F16K 31/50 (2013.01) [F16K 1/32 (2013.01); F16K 1/385 (2013.01); F16K 31/1221 (2013.01); F16K 31/508 (2013.01); F16K 31/53 (2013.01); F16K 31/60 (2013.01)] | 6 Claims |
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1. A valve device, comprising:
a valve casing internally including a flow path through which a fluid flows;
a valve main body capable of advancing and retracting in a first direction in the valve casing and capable of opening and closing the flow path;
a piston disposed in the valve casing and driven by oil pressure to advance and retract in the first direction;
a valve rod extending in the first direction around a first center axis, connecting the valve main body and the piston, and capable of advancing and retracting in the first direction integrally with the valve main body and the piston;
a rotary sleeve disposed on an outer side of the valve rod in a radial direction around the first center axis, formed in a tubular shape covering the valve rod, and rotatably supported on the valve casing in a first circumferential direction around the first center axis;
an operation shaft disposed on an outer side of the rotary sleeve in the radial direction and extending in a second direction intersecting the first direction around a second center axis;
an operation member fixed to a base end portion of the operation shaft in the second direction outside the valve casing and configured to rotate the operation shaft in a second circumferential direction around the second center axis;
an advancing and retracting sleeve formed in a tubular shape around the first center axis while covering the valve rod from an outer side in the radial direction on an inner side of the rotary sleeve in the radial direction and immovably fixed to the valve rod and the piston; and
a stopper member fixed to the valve casing at a position close to the valve main body in the first direction with respect to the advancing and retracting sleeve and configured to restrict an amount of movement of the advancing and retracting sleeve toward a first side in the first direction to a specified value predetermined, wherein
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, and
the stopper member is capable of coining into contact with the advancing and retracting sleeve when the advancing and retracting sleeve moves toward the first side in the first direction by the specified value.
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