Patent ID: 6772993
Filing Date: 2004-08-10
Classification: F16K

Abstract:
A plug and seal assembly for a fluid control valve, the fluid control valve having a valve housing defining an interior chamber and a flow opening fluidly communicating with the interior chamber and allowing fluid to escape the interior chamber, the assembly comprising:a seat ring engaged to the valve housing at the flow opening, the seat ring defining a vertical axis and including first, second, and third annular sealing discs disposed above respective first, second and third annular resilient bearing discs, the sealing and bearing discs collectively defining a truncated conical sealing surface having a predetermined half-angle relative the vertical axis; and a plug head axially slidable within the interior chamber and defining an upper cylindrical section and stepped first, second and third ramps, each of the ramps having a truncated conical shape of a half-angle that is less than the sealing surface half-angle, the upper cylindrical section and the ramps being sized and configured such that direct engagement thereof against the sealing and bearing discs creates three fluid-tight seals for blocking the flow of fluid out of the interior chamber.