Abstract: A screw rotor is made out of polymer. The screw rotor includes a shaft with a rotor body on it. The polymer of the shaft is reinforced with fibers. The shaft features elements that engage the rotor body or corresponding elements on the rotor body, such that the elements prevent an axial and/or rotational movement of the shaft with respect to the rotor body.

Abstract: A non-lubricated system for pumping a gas, includes a stationary stator with a housing that includes a rotor cavity and at least one rotatable rotor element incorporated within the rotor cavity. The stator includes at least one self-supporting sealing element, incorporated within the rotor cavity between an end face of at least one of the rotor elements and an interior wall of the housing to form a seal along the corresponding end face. At least one self-supporting sealing element is provided with an abradable coating on at least one side facing the rotor.

Abstract: Liquid separator provided with a housing which includes an at least partially cylindrical wall defining a separation chamber, closed at one end by a base and at the other end by a lid in which there is a gas outlet for the discharge of the treated gas. A shield is provided in the separation chamber surrounding the gas outlet in the separation chamber from the aforementioned lid. The liquid separator has an inlet for a liquid-gas mixture to be treated. The inlet is located in the lid so that the liquid-gas mixture tangentially enters the separation chamber in the space between the wall and the shield.

Abstract: Liquid separator provided with a housing which includes an at least partially cylindrical wall defining a separation chamber, closed at one end by a base and at the other end by a lid in which there is a gas outlet for the discharge of the treated gas. A shield is provided in the separation chamber surrounding the gas outlet in the separation chamber from the aforementioned lid. The liquid separator has an inlet for a liquid-gas mixture to be treated. The inlet is located in the lid so that the liquid-gas mixture tangentially enters the separation chamber in the space between the wall and the shield.