Patent ID: 6371731
Filing Date: 2002-04-16
Classification: F04B

Abstract:
A method for controlling a single or a network of oil less, two stage screw compressor packages, operatively connected to a pressure system in which pressure is to be maintained within a desired pressure range, for controlling the operation of the single or the network of screw compressor packages, the method comprising the steps of:providing at least one or a network of oil less, two stage screw compressor packages; operatively connecting the at least one or a network of oil less, two stage screw compressor packages to a pressure system in which pressure is to be maintained within a predetermined range of possible pressures; operatively connecting an electronic control system to at least one two stage screw compressor package; controlling the operation of the at least one or a network of oil less, two stage screw compressor packages by; determining the pressure exiting the first and the second screw compressor stages; comparing the determined pressure exiting the first screw compressor and the second screw compressor stages with a predetermined range of possible pressures; and if the determined pressure exiting either the first or the second screw compressor stages equals or exceeds the predetermined range of possible pressures, shutting down the screw compressor package before the screw compressor package is damaged; and following the shutting down of the screw compressor package, simultaneously releasing pressure within a first and a second compressor stage by a single valve means controlled by a single control signal.