Pumps – Successive stages – With interstage discharge or additional discharge from...
Patent
2000-03-27
2000-12-12
Moulis, Thomas N.
Pumps
Successive stages
With interstage discharge or additional discharge from...
217244, F04B 300
Patent
active
06158973&
ABSTRACT:
A multi-stage manual hydraulic pump comprising a plurality of cylinders in tandem. A block holds each cylinder assembly. One or more cylinders are the high volume stage, one or more cylinders are the medium volume stage and the final cylinders are the low volume, high pressure stage. The pump utilizes check valves built into flow tubes that control the direction of fluid. A variable hydraulic piston and cylinder assembly in each high volume block and each medium volume block automatically turns off the vacuum and flow of fluid to each cylinder at a designated pressure. At the point of highest pressure only the smallest cylinder or cylinders are pumping fluid, where the effort expended is significantly reduced.
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Astor Sanford
Moulis Thomas N.
Trench Plate Rental Co., Inc.
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