Valve assembly

Abstract

A valve assembly ( 10 ) comprises a conduit having a throughbore ( 19 ) and defining a longitudinal axis, a sealing member ( 20 ) that is moveable between an open configuration in which the throughbore ( 19 ) of the conduit is open, and a sealing configuration in which the sealing member ( 20 ) is arranged to substantially obturate the throughbore of the conduit, wherein in the sealing configuration, the sealing member ( 20 ) seals the throughbore ( 19 ) along a sealing line at least a part of which is angled relative to a direction perpendicular to the axis of the throughbore ( 19 ).

1 . A valve assembly comprising:
 a conduit having a throughbore and defining a longitudinal axis;   a sealing member that is moveable between an open configuration in which the throughbore of the conduit is open and a sealing configuration in which the sealing member is arranged to substantially obturate the throughbore of the conduit; and   wherein in the sealing configuration, the sealing member seals the throughbore along a sealing line at least a part of which is angled relative to a direction perpendicular to the longitudinal axis of the throughbore.   
     
     
         2 . A valve assembly as claimed in  claim 1 , wherein the shape of the sealing line is non-planar. 
     
     
         3 . A valve assembly as claimed  claim 1 , wherein the sealing member is both pivotally and axially moveable between the open configuration and the sealing configuration. 
     
     
         4 . A valve assembly as claimed in  claim 1 , wherein at least one face of the sealing member is curved around the longitudinal axis of the throughbore when in the open configuration. 
     
     
         5 . A valve assembly as claimed in  claim 4 , wherein the curve of the at least one face of the sealing member around the longitudinal axis comprises a substantially constant radius. 
     
     
         6 . A valve assembly as claimed in  claim 1 , wherein the sealing member comprises a convex face and the sealing line is arranged along the convex face of the sealing member. 
     
     
         7 . A valve assembly as claimed in  claim 1 , wherein an outer edge of the sealing member is shaped to conform to an inner surface of the conduit. 
     
     
         8 . A valve assembly as claimed in  claim 1 , wherein the sealing member is substantially spade shaped in plan. 
     
     
         9 . A valve assembly as claimed in  claim 1 , wherein in the sealing configuration, the sealing member substantially obturates the throughbore to restrict passage of fluids therethrough and retains pressure across the seal in at least one direction. 
     
     
         10 . A valve assembly as claimed in  claim 9 , wherein the valve assembly retains pressure across the seal in both directions. 
     
     
         11 . A valve assembly as claimed in  claim 1 , wherein the sealing line is arranged along an upstream face of the sealing member. 
     
     
         12 . A valve assembly as claimed in  claim 1 , wherein the sealing member comprises part of a sealing mechanism selectively actuable to move the sealing member between the open configuration and the sealing configuration. 
     
     
         13 . A valve assembly as claimed in  claim 12 , wherein the sealing member is pivotally coupled to the sealing mechanism and is pivotally movable within the bore. 
     
     
         14 . A valve assembly as claimed in  claim 13 , wherein the sealing member is pivotable through less than 90° of rotation to move between the open configuration and the sealing configuration. 
     
     
         15 . A valve assembly as claimed in  claim 14 , wherein the sealing member is pivotable through about 45° of rotation to move between the open configuration and the sealing configuration. 
     
     
         16 . A valve assembly as claimed in  claim 13 , wherein the sealing mechanism is actuable to cause axial movement of the sealing member. 
     
     
         17 . A valve assembly as claimed in  claim 13 , wherein the sealing member comprises pivotally attached first and second portions and the first portion is movable only in an axial direction, wherein the second portion is movable axially due to its attachment to the first portion as well as pivotally through pivot of the second portion relative to the first portion. 
     
     
         18 . A valve assembly as claimed in  claim 1 , further comprising a valve seat provided in the throughbore of the conduit, wherein the valve seat is arranged such that the sealing member seals against the valve seat in the sealing configuration. 
     
     
         19 . A valve assembly as claimed in  claim 18 , wherein the valve assembly further comprises a second valve seat for selective sealing against the sealing member. 
     
     
         20 . A valve assembly as claimed in  claim 19 , wherein at least one of the first and second valve seats moves relative to the sealing member. 
     
     
         21 . A valve assembly as claimed in  claim 19 , wherein the second valve seat is shaped to guide the sealing member towards the sealing configuration. 
     
     
         22 . A valve assembly as claimed in  claim 18 , wherein the first valve seat is mounted on an end face of a sleeve that is axially moveable within the bore of the conduit. 
     
     
         23 . A valve assembly as claimed in  claim 1 , wherein the valve assembly is resettable in that it is repeatably moveable between the open and sealing configurations. 
     
     
         24 . A valve assembly as claimed in  claim 23 , wherein the valve assembly comprises a reset system, the actuation of which can cause movement of the valve assembly from the sealing configuration to the open configuration. 
     
     
         25 . A valve assembly as claimed in  claim 24 , wherein the reset system is responsive to at least one of the following means selected from the group consisting of:
 a timer;   a radio frequency signal: a pressure pulse;   a mechanical driving means; and   electromagnetic induction, for selective movement of the valve assembly into a predetermined configuration.   
     
     
         26 . A self-cleaning flapper valve assembly as claimed in  claim 1 , wherein the flapper valve assembly and at least one valve seat is shaped such that movement of the sealing member from the open into the sealing configuration cleans the valve seat. 
     
     
         27 . A self-cleaning flapper valve assembly as claimed in  claim 26 , wherein the self-cleaning action is achieved by contact between the sealing member and the valve seat as the sealing member is moved into the sealing configuration, since the moving contact between the sealing member and the valve seat can scrape debris from the valve seat. 
     
     
         28 . A valve assembly comprising:
 a conduit with a throughbore for passage of fluid therethrough; and   a sealing member that is both pivotally and axially moveable between an open configuration in which the throughbore of the conduit is open and a sealing configuration in which the sealing member is arranged to substantially obturate the throughbore of the conduit.   
     
     
         29 . (canceled)