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Valve device

  • US 10,066,751 B2
  • Filed: 06/23/2015
  • Issued: 09/04/2018
  • Est. Priority Date: 07/07/2014
  • Status: Active Grant
First Claim
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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;

    R1<

    R2; and

    the valve opening is an ellipse hole extending in a rotating direction of the ball valve;

    a contact ring is defined on a radially inner end of the seat face that contacts the ball face when the seat opening is closed, andthe ellipse hole has an edge which is in local contact with a portion of the seat face, and a site of the edge is located on a radially outer side of the contact ring.

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