Patent ID: 7699070
Filing Date: 2010-04-20
Classification: G05D,Y10T

Abstract:
1. A shutoff valve apparatus comprising: a valve block having a valve chest; an inlet flow path where fluid flows to the valve chest; an outlet flow path where fluid flows out of the valve chest; a valve seat located in a valve port which comprises one of an inlet valve port of the inlet flow path and an outlet valve port of the outlet flow path; a metal diaphragm valve element having elastic repulsion force which can be bent and whose cross-section curves are formed circularly, and which is dividingly disposed in said valve chest in an opposed position with respect to said valve seat, and closes said valve port by contacting with said valve seat; an actuator plate which comprises an elastomer located on an opposite side of said metal diaphragm valve element to that of the valve port; a disc-shaped pressing protrusion formed in the shape of a button and inserted between the central portion of said actuator plate and the central portion of said metal diaphragm valve element, said disc-shaped pressing protrusion being operative to directly contact and press said metal diaphragm valve element against said valve seat, wherein said disc-shaped pressing protrusion has at a lower part thereof a protrusion component, a disc-shaped button holder fixed to the protrusion component and a plate holder which guides linearly said disc-shaped button holder at the lower part, and said actuator plate is mounted and fixed between said disc-shaped button holder and an undersurface of said disc-shaped pressing protrusion; an operation chamber which is located on an opposite side of said actuator plate to that of said metal diaphragm valve element, and operation gas is supplied thereto or exhausted therefrom; and an operation gas supply exhaust mechanism in which said operation gas is made to supply into or exhaust from said operation chamber, wherein said metal diaphragm valve element is pressed against said valve seat through the supply of said operation gas into said operation chamber, and wherein when said operation gas is exhausted from said operation chamber, said metal diaphragm valve element returns to an open state by an elastic repulsive force of said actuator plate and said metal diaphragm valve element.