Valve seals

摘要

A seal used in a valve includes a ring-shaped cartridge. The cartridge has a first portion and a second portion. The first and second portions hold a sealing portion, and the first and second portions have respective first and second curved surfaces adjacent to a sealing surface of the sealing portion. Radii of curvature of the curved surfaces enable an initial point of contact between a flow control member and the cartridge to be on the sealing surface when the flow control member moves to a closed position.

主权项

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.