4. Pumps
  5. Expansible chamber type
  6. Valved piston

Ray K. Ivey

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Valve assembly for sucker rod operated subsurface pumps

Pumps – Expansible chamber type – Fluid serially moved to opposite side of pumping member
Reexamination Certificate

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Valve cage for a rod drawn positive displacement pump

Pumps – Expansible chamber type – Valved piston
Patent

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Profile ID: LFUS-PAI-P-1431356

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