4. Valves and valve actuation
  5. Valve head movably connected for accommodation to seat
  6. With universal connection

Paul B. Soderberg

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Apparatus and method for automatically and periodically introduc

Wells – Processes – Producing the well
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Hemi-wedge valve

Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
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Oil well pump system and method

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Pumps – Motor driven – Fluid motor
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