HYDRAULIC BI-DIRECTIONAL ROTARY ISOLATION VALVE

摘要

A valve (156) having a sealing surface that is rotated 90 degrees on trunnions (62) that move along a track is provided. A sleeve (42) that moves into position to protect the valve mechanism (56) when the valve is in an open position is provided. A second (74) sleeve locks the sealing element of the valve in place in the closed position. The valve may be used during drilling of wells to prevent flow in casing when the drill pipe and bit are raised above the valve.