| 摘要 |
PURPOSE:To reduce the bending stress at the position, at which the lift of a valve plate is maximum, by a structure wherein the radial radius of curvature of a valve receiver at said position are made larger than that at any position except said position. CONSTITUTION:The radial radius of curvature of a valve receiver 5 is formed R within the range of (x) and infinitely large outside of the range (x). When a valve plate 1 deforms itself along the valve receiver 5, the valve receiver side surface bending stress at the position 4, at which the lift of the valve plate 1 is maximum, becomes lower than ever. Especially, because the radial radius of curvature at the position 4, at which the lift is maximum, is infinitely large, the radial stress at the position 4 becomes zero. |
