Patent ID: 8814138
Filing Date: 2014-08-26
Classification: F16K

Abstract:
1. A seal for use in a valve, comprising: a ring-shaped cartridge, the cartridge having a first portion and a second portion opposite the first portion, and a compressible sealing portion captured between the first and second portions, the first and second portions having respective first and second curved surfaces adjacent to a sealing surface of the compressible sealing portion, wherein the curved surfaces enable a flow control member to compress the sealing portion prior to contacting the curved surfaces when the flow control member moves to a closed position, and wherein the sealing surface is curved, the sealing surface having a first radius of curvature and a second radius of curvature, the first radius of curvature being connected to and substantially equal to the radius of curvature of the first curved surface and the second radius of curvature being different than the first radius of curvature.