초록 ▼

An improved remotely operable safety valve which is adapted for use between the swivel and the kelly is disclosed. An annular hydraulic piston moves the valve to the open and closed position whether or not the drill string is rotating, and in the event of hydraulic failure, the valve may be operated

An improved remotely operable safety valve which is adapted for use between the swivel and the kelly is disclosed. An annular hydraulic piston moves the valve to the open and closed position whether or not the drill string is rotating, and in the event of hydraulic failure, the valve may be operated manually. Centering spring means are provided to reduce wear on the operable elements when the valve is in the open position.

대표청구항 ▼

An improved remotely operable valve for controlling fluid flow through a rotating tubular member having, a stationary housing, a remotely disposed source of pressurized hydraulic fluid, a tubular rotatable housing, having a flow passage formed therein, which is rotatably mounted with respect to the

An improved remotely operable valve for controlling fluid flow through a rotating tubular member having, a stationary housing, a remotely disposed source of pressurized hydraulic fluid, a tubular rotatable housing, having a flow passage formed therein, which is rotatably mounted with respect to the stationary housing section, valve means mounted within said rotatable housing for controlling fluid flow through said flow passage by rotation of a valve shaft between an open position for enabling fluid flow and a closed position for blocking fluid flow, piston means disposed in said stationary housing and operably connected to said source of hydraulic fluid and connected to a bearing means, an actuating assembly means having a bearing contact surface, said actuating assembly means for operably connecting said stationary housing to said valve shaft in order to open or close the valve means, said actuating assembly means being rotatable with said rotatable housing and mounted for axial movement with respect to said rotatable housing to control said valve, said bearing means connected to said piston means rotatably contacting said bearing contact surface of said actuating assembly means for axially operably moving the actuating assembly, the valve being remotely operable to permit opening or closing of the flow path while enabling relative rotation between the rotatable housing and the stationary housing, wherein the improvement comprises, means for removing said source of pressurized fluid on said piston means after said valve has been opened, and means for automatically preventing contact between the bearing contact surface of the rotating actuating assembly means and the bearing means when the valve is in the open position and said source of pressurized fluid has been removed from said piston means.