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A hydraulically powered compressor has infinitely variable capacity control through use of a variable displacement hydraulic pump, and a hydraulic control and power system provides the infinitely variable capacity control with a proportionate change in required power. Components may be mounted in an

A hydraulically powered compressor has infinitely variable capacity control through use of a variable displacement hydraulic pump, and a hydraulic control and power system provides the infinitely variable capacity control with a proportionate change in required power. Components may be mounted in an air duct.

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A hydraulically powered compressor for elevating the pressure of gaseous substances, comprising; a first double-acting piston and compression cylinder for initially compressing the gaseous substance; a second double-acting piston and compression cylinder for additional compression of the gaseous sub

A hydraulically powered compressor for elevating the pressure of gaseous substances, comprising; a first double-acting piston and compression cylinder for initially compressing the gaseous substance; a second double-acting piston and compression cylinder for additional compression of the gaseous substance; a hydraulic power piston and cylinder disposed between the first and second double-acting pistons and cylinders; the first and second double acting pistons and the hydraulic power piston each being disposed on a common elongate piston rod; first piping for transferring the compressed gaseous substance from the first piston and compression cylinder to the second piston and compression cylinder; second piping for transferring the compressed gaseous substance from the second piston and compression cylinder to an exit orifice; first and second coils respectively associated with the first and second piping for cooling the compressed gaseous substance; means for forcing air to flow over the first and second cooling coils; the first and second pistons and compression cylinders, power piston and cylinder, first and second piping, first and second cooling coils, and air forcing means are all disposed within an air-cooling duct to provide cooling thereto; and means for providing infinitely variable capacity control with a proportionately variable power requirement for the first and second pistons and compression cylinders, such means including a variable displacement hydraulic pump means for actuating the hydraulic power piston and cylinder so that the first and second pistons and compression cylinders may be operated over a range of from 0 to 100% of their capacity, with a proportionately variable power requirement.