4. Wells
  5. Valves, closures or changeable restrictors

Hydril Company

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Actuator for a drill string internal blowout preventer

Valves and valve actuation – Fluid actuated or retarded – With mechanical movement between actuator and valve
Patent

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Annular blowout preventer packing unit

Valves and valve actuation – Blow-out preventers – Deformable annulus
Patent

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Annular packing unit and insert

Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent

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Apparatus and method for arresting the propagation of a buckle i

Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...
Patent

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Apparatus and method for installing internal annular rings in tu

Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent

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