Patent ID: 7121297
Filing Date: 2006-10-17
Classification: F15B,F16K,Y10T

Abstract:
1. Valve arrangement in a hydraulic circuit, having an L-shaped duct arrangement, in which a throttling element whose length can be adjusted can be displaced in the direction of one arm of the L-shaped duct arrangement in accordance with the position of a pilot control valve, the adjustment of the length of the throttling element being made under the influence of the hydraulic fluid entering its interior and the design being such that the throttling element is pushed into the duct when a specific threshold pressure of the hydraulic fluid is exceeded, irrespective of the flow direction of the hydraulic fluid, but its length is shortened when the inflow from a longitudinal duct ( 3 ) to a transverse duct ( 2 ) takes place at a pressure higher than the threshold pressure such that throttling action does not occur; said valve arrangement, in which the L-shaped duct arrangement in a stationary part ( 1 ) is formed by the longitudinal duct ( 3 ) and the transverse duct ( 2 ) connected thereto and running transversely with respect thereto and in which, in the axial direction of the longitudinal duct ( 3 ), on the side opposite the transverse duct ( 2 ), there is a holding and guiding bore ( 4 ) for the throttling element, which has a throttle slide ( 10 ) and a valve piston ( 21 ), having the following features: a) in the holding and guiding bore ( b) in the outer region, open at the end, of the tubular throttle slide ( c) over part of its longitudinal extent, the holding and guiding bore ( d) the interiors (