Patent ID: 9206668
Filing Date: 2015-12-08
Classification: E21B

Abstract:
1. An oil or gas well valve, the valve having a through bore with an axis and comprising a movable member configured to move between open and closed configurations of the valve to allow flow of fluid through the through bore of the valve when the valve is in the open configuration, and to resist flow of fluid through the through bore of the valve when the valve is in the closed configuration, the valve having a sealing member in the form of a sealing sleeve providing a seat for seating of the movable member when the movable member is in the closed configuration; the valve having an anvil member axially fixed within the through bore; the movable member having a cutting surface arranged to shear against a cutting surface of the axially fixed anvil member when the movable member is moving between the open and closed configurations; wherein the sealing sleeve is axially movable within the through bore relative to the movable member and the axially fixed anvil member and the axially movable sealing sleeve are arranged with the axially fixed anvil member disposed radially inside the axially movable sealing sleeve, and the axially movable sealing sleeve surrounding the axially fixed anvil member; and wherein the valve includes a sealing member displacement mechanism configured to space the axially movable sealing sleeve axially away from the movable member when the movable member is moving between the open configuration and the closed configuration.