Abstract: A rotary compressor having a drive motor and a single pressure vessel, wherein the pressure vessel acts both as a gas oil separator and as a compressed gas storage tank. The compressor employs a control for valves in order to close off the supply of oil and gas from entering the compressor prior to cessation of the compressor's rotation.

Abstract: A flooded compressor system has a compressor unit (10) with intermeshing rotors and a separator (12) for retaining a volume of liquid. The separator (12) is arranged to receive compressed gas and liquid discharged from the compressor unit (10) through an outlet (17) and is formed solely by a single length of pipe of substantially uniform cross section which has a first substantially horizontal portion (19) to retain a liquid pool (18) and a second elevated portion (23) connected to the first portion by a bend in the pipe. A compressed gas outlet (25) leads from the second elevated portion to a separate filter element (14), and a liquid filter element (30) is mounted from, and communicates directly with the first horizontal portion of the pipe.

Abstract: A compressor system arrangement of the type arranged to compress a liquid gas/mixture and discharge same into a separator vessel where the compressed gas is separated from the liquid and passed to a clean compressed gas outlet. To make such compressor systems competitive with other gas compressors it is necessary to make the overall system package smaller and to achieve this in accordance with the present invention, the compressor (7) is housed substantially within the separator vessel (2) and the filter element (4) is annularly disposed adjacent to a circumferential wall (22) of the separator vessel (2) with the filter element 4 being preferably housed within a dry sump compartment defined by a partition wall (40) with one or more access openings (42,63,3) located in an upper region of the separator vessel (2) in a position of use of the compressor system.