| HEMIWEDGE VALVE CORPORATION Patent applications |
| Patent application number | Title | Published |
|---|
| 20100308247 | Hemi-Wedge Verifiable Shutoff Valve - An improved hemi-wedge type valve is disclosed that has upstream and downstream sealing surfaces that cooperate with opposed surfaces on the hemi-wedge valve member. This results in improved sealing and less leakage, at both high and low pressures. | 12-09-2010 |
| 20090272539 | Mechanical Bi-Directional Isolation Valve - A valve having a sealing surface that is rotated 90 degrees on axial floating hinge assemblies is provided. A sleeve moves into position to protect the valve mechanism when the valve is in an open position. A sleeve locks the valve sealing element in place in either a closed or open position. The valve may be used during drilling of wells to prevent flow into the casing when the drill pipe and bit are raised above the valve. | 11-05-2009 |
| 20090229829 | Hydraulic Bi-Directional Rotary Isolation Valve - A valve having a sealing surface that is rotated 90 degrees on trunnions that move along a track is provided. A sleeve that moves into position to protect the valve mechanism when the valve is in an open position is provided. A second 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. | 09-17-2009 |
