VALVE DEVICE
First Claim
Patent Images
1. A valve device comprising:
- a ball valve having a ball face shaped in a convex spherical surface; and
a valve seat having a seat face shaped in a concave spherical surface, the seat face being pressed onto the ball face, whereinthe ball valve being rotated to open by communicating a valve opening defined in the ball valve and a seat opening defined in the valve seat with each other,given that a diameter of the valve opening is φ
1,given that a diameter of the seat opening is φ
2,given that a curvature radius of the ball face is R1,given that a curvature radius of the seat face is R2,a following relationship is satisfied;
φ
1>
φ
2; and
R1≦
R2; and
the valve opening is an ellipse hole extending in a rotating direction of the ball valve.
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Abstract
A valve device includes: a ball valve having a ball face shaped in a convex spherical surface; and a valve seat having a seat face shaped in a concave spherical surface. The seat face is pressed onto the ball face. The ball valve is rotated to open a valve by communicating a valve opening defined in the ball valve and a seat opening defined in the valve seat with each other, and to close the valve by stop the communication. A diameter of the seat opening φ2 is smaller than a diameter of the valve opening φ1. A curvature radius of the ball face R1 is smaller than or equal to a curvature radius of the seat face is R2.
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Citations
14 Claims
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1. A valve device comprising:
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a ball valve having a ball face shaped in a convex spherical surface; and a valve seat having a seat face shaped in a concave spherical surface, the seat face being pressed onto the ball face, wherein the ball valve being rotated to open by communicating a valve opening defined in the ball valve and a seat opening defined in the valve seat with each other, given that a diameter of the valve opening is φ
1,given that a diameter of the seat opening is φ
2,given that a curvature radius of the ball face is R1, given that a curvature radius of the seat face is R2, a following relationship is satisfied;
φ
1>
φ
2; and
R1≦
R2; andthe valve opening is an ellipse hole extending in a rotating direction of the ball valve. - View Dependent Claims (3, 4, 5, 6, 7)
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2. (canceled)
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8. A valve device comprising:
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a ball valve having a ball face shaped in a convex spherical surface; and a valve seat having a seat face shaped in a concave spherical surface, the seat face being pressed onto the ball face, wherein the ball valve being rotated to open by communicating a valve opening-defined in the ball valve and a seat opening defined in the valve seat with each other, given that a diameter of the valve opening is φ
1,given that a diameter of the seat opening is φ
2,given that a curvature radius of the ball face is R1, given that a curvature radius of the seat face is R2, a following relationship is satisfied;
φ
1>
φ
2; and
R1≦
R2,the valve seat has a seat opposite face opposite from the seat face; a back pressure space is defined adjacent to the seat opposite face, fluid flowing into the valve device being guided to the back pressure space; when the valve is closed, only a radially inner side of the seat face is in contact with the ball face to define a contact ring at a site where the ball face and the seat face oppose to each other; an annular gap is defined between the ball valve and the valve seat, on an outer circumference side of the contact ring, fluid being able to flow into the annular gap when the valve is closed; and common fluid is guided into the annular gap and the back pressure space. - View Dependent Claims (9)
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10. A valve device comprising:
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a ball valve having a ball face shaped in a convex spherical surface; a valve seat having a seat face shaped in a concave spherical surface, the seat face being pressed onto the ball face; and a housing having an inlet that lets in fluid and an outlet that lets out fluid, wherein; the ball valve being rotated to open by communicating a valve opening-defined in the ball valve and a seat opening defined in the valve seat with each other; given that a diameter of the valve opening is φ
1;given that a diameter of the seat opening is φ
2;given that a curvature radius of the ball face is R1; given that a curvature radius of the seat face is R2; a following relationship is satisfied;
φ
1>
φ
2; and
R1≦
R2;the ball valve is rotated in the housing, and is substantially cup-shaped; the ball valve is rotated to change a degree of communication between the inlet and the outlet; a center of a flow path guiding fluid from the inlet into the cup-shaped ball valve is defined as an inlet axis, and a center of a flow path guiding fluid from inside of the cup-shaped ball valve toward the outlet is defined as an outlet axis, the ball valve has an opening in the same direction as a rotational axis of the ball valve; and the rotational axis is provided at an obtuse angle relative to the outlet axis or the inlet axis. - View Dependent Claims (11)
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12. A valve device comprising:
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a ball valve having a ball face shaped in a convex spherical surface; a valve seat having a seat face shaped in a concave spherical surface, the seat face being pressed onto the ball face; a housing that houses the ball valve; a shaft passing through the housing, the shaft being configured to rotate integrally with the ball valve; a seal member that seals a clearance between the housing and the shaft; and a labyrinth that attenuates kinetic energy of fluid going toward the seal member in the housing, wherein the ball valve being rotated to open by communicating a valve opening-defined in the ball valve and a seat opening defined in the valve seat with each other, given that a diameter of the valve opening is φ
1,given that a diameter of the seat opening is φ
2,given that a curvature radius of the ball face is R1, given that a curvature radius of the seat face is R2, and a following relationship is satisfied;
φ
1>
φ
2; and
R1≦
R2. - View Dependent Claims (13, 14)
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Specification