Patent ID: 6062828
Filing Date: 2000-05-16
Classification: F04B

Abstract:
A compressor comprising:a central liquid cylinder;two gas cylinders disposed adjacent opposite ends of the liquid cylinder that are axially aligned therewith,a piston assembly disposed within the cylinders that comprises a central liquid drive piston and two compression pistons that are free to slide within the respective liquid and gas cylinders;a low pressure gas manifold coupled to the piston assembly;a liquid-gas manifold coupled to opposite ends of the piston assembly;a liquid switching valve having a first port comprising a high pressure liquid inlet, a second port coupled to an inlet of the central liquid cylinder, a third port coupled to an outlet of the central liquid cylinder, and a fourth port coupled to the liquid-gas manifold; andlimit switches disposed at opposite ends of the piston assembly that are coupled to the liquid switching valve and cause the switching valve to rotate as a function of movement of the piston assembly.