4. Valves and valve actuation
  5. Fluid actuated or retarded
  6. Fluid and non-fluid actuators

Petroleum Designers, Inc.

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Expanding gate valve

Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent

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Pressure balanced gate valve having selective actuator systems

Valves and valve actuation – Fluid actuated or retarded – Fluid and non-fluid actuators
Patent

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Sealing system for pressurized flanged joints

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

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Well casing suspension system

Pipe joints or couplings – Frangible element
Patent

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