Valve

摘要

A valve has a moveable member movable between open and closed configurations and a cutting device arranged to shear against an anvil member when moving between the open and closed configurations and a sealing member providing a seat for seating of the moveable member when the moveable member is in the closed configuration. The anvil member and the sealing member are moveable relative to one another when the moveable member is moving from the open to the closed configuration. During opening and closing the sealing member is displaced away from the cutting device as the cutting device engages the anvil member. The sealing member is pushed away from the moveable member and the anvil to a maximum separation from the movable member at the point on the stroke when the cutting surface of the moveable member is moving past the anvil member.

主权项

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.