Exhaust gas recirculation valve

Abstract

A valve that constitutes part of an exhaust gas recirculation valve is connected to a shaft, such that the valve is rotatable together with the shaft in the interior of a main body. An outer peripheral surface of the valve is formed in a substantial spherical shape, the axis (center of curvature) of the valve and the axis of the shaft being arranged eccentrically by a predetermined distance along a flow direction of the exhaust gas. In addition, a percentage between the eccentric distance between the center of curvature of the valve and the axis of the shaft, and the diameter of a gas inlet port of the main body into which the exhaust gas flows is 5.5% or greater.

What is claimed is: 
     
         1 . An exhaust gas recirculation valve comprising a body having a fluid passage through which an exhaust gas flows, a valve arranged in the fluid passage that switches a flow through state of the exhaust gas, at least a portion of an outer peripheral surface of the valve being spherically shaped, a seat member having a seat section, which is disposed in the fluid passage on an upstream side from the valve and on which the valve is seated, and a shaft connected to the valve and which rotates the valve,
 wherein a percentage of an eccentricity amount between a center of curvature of the valve when the valve is completely closed and an axis of the shaft along a direction of flow of the exhaust gas with respect to a diameter of an inlet port formed in the body and into which the exhaust gas flows is 5.5% or greater.