Patent ID: 8297315

Claim:
A throttle valve ( 1 , 25 ), having a housing ( 2 ), comprising an inlet opening ( 3 ) for a fluid under an inlet pressure, a throttle ( 4 , 27 ), by means of which the fluid can be throttled to an outlet pressure, and an outlet opening ( 5 ) for the fluid, and an actuation element ( 11 , 32 ) at the outside of the housing ( 2 ), a rotatable shaft ( 13 ), and a piston ( 16 ), which is axially movable within the housing ( 2 ) in a tubular throttle cage ( 15 ) having plural radial openings, wherein a rotation of the shaft ( 13 ) can be induced by the actuation element ( 11 , 32 ) and an axial movement of the piston ( 16 ) can be induced by the rotation of the shaft ( 13 ) and by the axial movement of the piston ( 16 ) a throttle cross section of the throttle ( 4 , 27 ) can be adjusted and the plural radial openings are successively closed or opened by the piston to determine an effective cross section for flow of the fluid, wherein primary magnets are mounted to the actuation element ( 11 , 32 ), secondary magnets are mounted to the shaft ( 13 ), and a roller body screw drive ( 20 ) having balls or threaded rods is mounted to the shaft ( 13 ), said balls or threaded rods rolling at least on a translatorically moved component for converting between rotating and linear movement, wherein a rotation of the actuation element ( 11 , 32 ) is transferred to the shaft ( 13 ) by means of magnetic coupling of the primary magnets with the secondary magnets, and converted into the axial movement of the piston ( 16 ) by means of the roller element screw drive ( 20 ).