Abstract: A device for compressing and expanding gases, wherein the device comprises an apparatus that can be driven in two directions, whereby in one direction the apparatus operates to compress a gas and in the other direction the apparatus operates to expand a gas.

Abstract: A method for expanding a gas flow between an inlet for the supply of the gas flow at certain inlet conditions of inlet pressure and inlet temperature and an outlet for the delivery of expanded gas at certain desired outlet conditions of outlet pressure and outlet temperature, whereby this method at least comprises the step of at least partly expanding the gas flow between the inlet and the outlet through a pressure reducing valve and at least partly expanding it through a pressure reducing unit with a rotor driven by the gas for converting the energy contained in the gas into mechanical energy on this shaft.

Abstract: A device for expanding steam, whereby this device comprises an expander with an inlet that is connected to an inlet pipe and an outlet that is connected to an outlet pipe, whereby the inlet pipe is provided with an inlet valve and the outlet pipe is provided with an outlet valve for isolating the space between the valves, by closing these valves when the expander is not operating, whereby the device is provided with a steam supply that conditions the space between the valves when the expander is not operating, such that no air can penetrate into the space.

Abstract: A device for compressing and expanding gases, wherein the device comprises an apparatus that can be driven in two directions, whereby in one direction the apparatus operates to compress a gas and in the other direction the apparatus operates to expand a gas.

Abstract: A device for expanding steam, whereby this device comprises an expander with an inlet that is connected to an inlet pipe and an outlet that is connected to an outlet pipe, whereby the inlet pipe is provided with an inlet valve and the outlet pipe is provided with an outlet valve for isolating the space between the valves, by closing these valves when the expander is not operating, whereby the device is provided with a steam supply that conditions the space between the valves when the expander is not operating, such that no air can penetrate into the space.

Abstract: A method for expanding a gas flow between an inlet for the supply of the gas flow at certain inlet conditions of inlet pressure and inlet temperature and an outlet for the delivery of expanded gas at certain desired outlet conditions of outlet pressure and outlet temperature, whereby this method at least comprises the step of at least partly expanding the gas flow between the inlet and the outlet through a pressure reducing valve and at least partly expanding it through a pressure reducing unit with a rotor driven by the gas for converting the energy contained in the gas into mechanical energy on this shaft.

Abstract: Method for controlling a device that includes at least a compressor installation and/or a drying device and a heat recovery system. The heat recovery system absorbs heat from the compressor installation, and the device further includes a controller and device for determining one or more system parameters. The controller controls both the compressor installation and/or the drying device and the heat recovery system on the basis of the system parameters, so that the overall efficiency of the device is optimized.

Abstract: Method for controlling a device that includes at least a compressor installation and/or a drying device and a heat recovery system. The heat recovery system absorbs heat from the compressor installation, and the device further includes a controller and device for determining one or more system parameters. The controller controls both the compressor installation and/or the drying device and the heat recovery system on the basis of the system parameters, so that the overall efficiency of the device is optimised.