Patent ID: 7201183
Filing Date: 2007-04-10
Classification: F15B,F16K,Y10T

Abstract:
1. Valve arrangement in a hydraulic circuit, having a longitudinal duct ( 3 ) which opens into a transverse duct ( 2 ) having a tubular throttle slide ( 10 ) which can be displaced in some regions in the longitudinal duct ( 3 ) and which is acted on in the longitudinal duct ( 3 ) with relatively different penetration depths in the direction of one of two different end positions by the hydraulic fluid flowing through the above arrangement, depending on its falling above or below a specific threshold pressure, having lateral passage openings ( 33 a , 35 a ) in the wall of the throttle slide ( 10 ), which are arranged in a plurality of groups ( 33 , 35 ) located with an axial spacing from one another and, in the end position of lower penetration depth of the throttle slide ( 10 ), are connected to the transverse duct ( 2 ) while, in the end position of greater penetration depth, group ( 33 ) of passage openings ( 33 a ), facing the penetrating end ( 32 ) of the throttle slide ( 10 ), is covered by the wall of the longitudinal duct ( 3 ), and having a tubular valve piston ( 25 ) of stepped design which can be displaced in the throttle slide ( 10 ) and, depending on its position in the throttle slide ( 10 ), blocks or enables the flow of hydraulic fluid through the interior of the valve piston ( 25 ) in the region between the first group ( 33 ) of passage openings ( 33 a ) and the remaining passage openings ( 35 a ), a throttling action of the valve arrangement occurring as a result of intermediate positions of the valve slide ( 10 ) between its two end positions and in the blocking position of the valve piston ( 25 ) when hydraulic fluid under a pressure higher than the threshold pressure flows through the valve arrangement in the direction from the transverse duct ( 2 ) to the longitudinal duct ( 3 ).