Hydraulic pumping apparatus and method of operation

Details Hydraulic pumping apparatus and method of operation Hydraulic pumping apparatus and method of operation

1986-01-16

1987-02-24

Smith, Leonard E.

Pumps

Motor driven

Fluid motor

91297, 91307, 91319, F04B 912

Patent

active

046454314

ABSTRACT:
A hydraulically actuated pumping apparatus including a piston-driven, plunger-type injection pump in combination with a three-way normally closed pilot-operated relay valve, and a variable restrictor adjustable during operation of the pumping apparatus for controlling the flow of a pilot fluid to the relay valve. Pilot fluid is vented from the relay valve through passageways in the plunger of the injection pump at the completion of each pumping stroke.

REFERENCES:
patent: 2834295 (1958-05-01), Hjarpe
patent: 2889817 (1959-06-01), Hard af Segerstad
patent: 3489100 (1970-01-01), Hill
patent: 3963383 (1976-06-01), Hill
patent: 4042311 (1977-08-01), Yonezawa
patent: 4093406 (1978-06-01), Miller

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