Patent ID: 7036790
Filing Date: 2006-05-02
Classification: F16K,G05D,Y10T

Abstract:
1. A vacuum pressure regulating valve comprising: a first main port and a second main port respectively connected to one of a vacuum pump and a vacuum chamber and the other; an annular valve seat formed in a connecting path connecting both of said main ports; a circular flow path wall coaxially surrounding the valve seat and having a diameter greater than a seat diameter of the valve seat; a disc-shaped valve member which has a front face mounted with a first sealing member for opening and closing the valve seat and a circular outer peripheral wall having a diameter smaller than that of the flow path wall and greater than the seat diameter and which is fitted in the flow path wall to thereby form a restricted flow path between the flow path wall and the outer peripheral wall; and a driving portion for causing the valve member to carry out opening and closing operations wherein a height of the flow path wall and a height of the outer peripheral wall of the valve member approximate each other.