Patent ID: 8113792

Claim:
A compressor unit for compressing a process fluid, comprising: a compressor with an inlet, a compressing stage, and an outlet; a motor with a stator and a rotor; a cooling system with a cooling fluid for cooling the motor; and a pressure compensator, wherein the cooling system is connected to a first terminal of the pressure compensator in a pressure transmitting way, wherein a second terminal of the pressure compensator is connected to a point in a flow path of the process fluid flowing from the inlet through the compression stage and through the outlet, and wherein the pressure compensator establishes a relation between a fluid pressure of the cooling fluid in the cooling system and a process fluid pressure of the process fluid in the flow path of the compressor, wherein the compressor comprises two compression stages connected in series via a crossover connection, and wherein the second terminal of the pressure compensator is connected to the crossover connection between a first stage and a second stage of the compressor.