Patent ID: 6102060
Filing Date: 2000-08-15
Classification: E21B,Y10T

Abstract:
A valve device for use down hole comprising a body member; a channel through the body member through which fluid can flow; a moveable member mounted within the body member, the moveable member comprising an obturating member for selectively obturating the channel, the movable member being moveable between a first position in which the channel is not obturated and fluid flow through the channel is permitted, and the second position in which the channel is obturated and fluid flow through the channel is substantially prevented, wherein the valve device further comprises a detachable locking device that locks the moveable member in the first position until a displacement system is actuated to unlock the detachable locking device, wherein the displacement system comprises a drop ball seat which is coupled to the moveable member, and a drop ball such that when the drop ball seat unlocks the locking device, in use.