Hydraulic oil well pumping apparatus

Details Hydraulic oil well pumping apparatus Hydraulic oil well pumping apparatus

1979-07-30

1981-11-10

Smith, Leonard E.

Pumps

Expansible chamber type

Pumping member position controlled port

417401, 91314, 91347, 92146, F04B 4704

Patent

active

042995450

ABSTRACT:
An oil well pump which uses a pair of vertical hydraulic pistons to raise a cross beam. The polish rod is secured to the cross beam. At the top of the stroke automatic limit switches reverse the hydraulic fluid flow to allow the polish rod to descend and complete the pumping cycle.

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