Patent ID: 7140385

Claim:
A valve arrangement for controlling hydraulic fluid in an axial piston machine, in which a first flow duct ( 2 ) is provided in a stationary part ( 1 ) and opens out into a second flow duct ( 5 ) running transversely with respect to it, comprising: an accommodating space ( 14 ) of the stationary part ( 1 ) lying opposite the second flow duct ( 5 ) in the extension of the first flow duct ( 2 ) for accommodating and guiding a multiple valve body ( 20 ), which is displaced in the direction of the central axis ( 3 ) of the first flow duct ( 2 ); the multiple valve body having a first and a second valve body which are arranged one behind the other in the direction of the longitudinal axis of the first flow duct ( 2 ) and are displaced in relation to each other in this direction; the first valve body facing the first flow duct ( 2 ) engaging with a first valve seat ( 4 ) formed in the region in which the first flow duct ( 2 ) opens out into the second flow duct ( 5 ) to form a first valve (V 1 ); the second valve body engaging with a second valve seat ( 29 ) formed in the first valve body and situated in the region of the second flow duct ( 5 ) to form a second valve (V 2 ), the hydraulic cross section F 2 of the second valve seat ( 29 ) being larger than the hydraulic cross section F 3 of the first valve seat ( 4 ) and the two valve bodies being prestressed against their valve seats ( 4 , 29 ) by first and second compression springs ( 27 , 28 ); the accommodating space ( 14 ) of the stationary part ( 1 ) being connected to the first flow duct ( 2 ) via the two valve bodies and sealed from the second flow duct ( 5 ); and the hydraulically effective cross sections F 2 and F 3 of the first and second valve seat ( 4 , 29 ) having dimensioned and the two compression springs ( 27 , 28 ) being coordinated such that the first valve (V 1 ) opens when the hydraulic fluid in the second flow duct ( 5 ) has a pressure P 5 which is larger than the pressure P 2 in the first flow duct ( 2 ) and the threshold value is exceeded, or the second valve (V 2 ) opens when the hydraulic fluid in the first flow duct ( 2 ) has a pressure P 2 which is greater than the pressure P 5 in the second flow duct ( 5 ) and a threshold value is exceeded, while in the inoperative position the two valves (V 1 , V 2 ) are closed.