Double action pump

Details Double action pump Double action pump

1979-01-22

1981-10-06

Jenkins, Robert W.

Pumps

Successive stages

Condition responsive control of fluid

417397, 91290, 100251, F04B 300

Patent

active

042932866

ABSTRACT:
A two-stage pump is illustrated of the type employing a piston having two diameters, one capable of providing a large volume of fluid flow at low pressure so as to move a fluid operated press rapidly until a load is encountered, at which time fluid is delivered at a low volume at high pressure for operation of the press wherein the flow control means are positioned in a piston housing independent of the piston.

REFERENCES:
patent: 18225 (1857-09-01), Ruberts
patent: 2422895 (1947-06-01), Habenicht
patent: 2820415 (1958-01-01), Born
patent: 2938465 (1960-05-01), McFarland et al.
patent: 2946287 (1960-07-01), Bessiere
patent: 2948222 (1960-08-01), Pine
patent: 3776665 (1973-12-01), Dalton

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