Patent ID: 7469712
Filing Date: 2008-12-30
Classification: F02C,F05D,Y10T

Abstract:
1. A valve for a turbine, the valve comprising: a housing defining a passageway between an inlet and an outlet; a first seal extending about the passageway; a second seal extending about the passageway at an axial distance from the first seal; a valve member disposed between the first and second seals and intersecting the passageway, the valve member being arranged to toggle between a first closed position in which the valve member is seated against the first seal and a second closed position in which the valve member is seated against the second seal, flow to the outlet being closed off when the valve member is in the first and second closed positions, wherein the valve member has an enlarged head with a contoured outer periphery disposed within an opening defined by a narrowed neck of the housing; and a biasing member biasing the valve member in contact with the first seal; wherein the valve member is in the first closed position when pressure at the inlet is below a crack pressure and the valve member is in the second closed position when the inlet pressure is above a close pressure, and wherein when the valve member is between the first and second closed positions it is unseated from the first and second seals so that flow can pass to the outlet, wherein at least a portion of the outer periphery of the head of the valve member is disposed radially within the narrowed neck in both the first and second closed positions.