Patent ID: 7337610
Filing Date: 2008-03-04
Classification: E02F,F15B

Abstract:
1. An improved hydraulic circuit arrangement for a spring support system having a hydraulic cylinder provided with at least one first chamber, a hydraulic tank, at least one conveying device conveying a hydraulic fluid, a hydraulic accumulator, a hydraulic line arranged between the hydraulic accumulator and the first chamber, a first selector valve arranged in the first hydraulic line, a first supply line for the first chamber, a control implement with at least three switch positions that include a lifting position, a lowering position and a neutral position for the hydraulic cylinder and a pipe break safety arrangement arranged in the first supply line that includes a check valve closing in the direction of the control implement and a pressure relief valve that can be controlled over a first control pressure line, wherein the improvement comprises: the first control pressure line extending between the pipe break safety arrangement and a conveying device; and, the first switching devices are arranged in the first control pressure line, so that by switching the first switching devices a control pressure can be applied to the first control pressure line and the pressure relief valve can be controlled to open.