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AssigneeDanfoss Fluid Power A/S
InventorsSiegfried Zenker, Carsten Christensen, Thorkild Christensen
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A hydraulic valve arrangement with locking and floating function, with a control valve (9), which, for two operating positions (11, 12) connects one motor connection (A) with a pump connection and a second motor connection (B) with a tank connection and vice versa, in a floating position (13) connects both motor connections (A, B) with the tank connection and in a locking position (10) separates both motor connections (A, B) from the pump and tank connections. Further, there are two closing valves (16, 17), each being connected between the control valve (9) and a motor connection (A, B) and each having a piston loaded by a spring and limiting a spring chamber, the spring chambers being pressure releasable. Characteristic of this valve arrangement is that lifting valves (18, 19) are provided for the pressure release, which valves are operated by a control pressure depending on the position of the control valve (9). This improves the operating reliability.
Hydraulic valve arrangement with locking and floating functions, and including a control valve having two operating positions, one operating position which connects one motor connection with a pump connection and a second motor connection with a tank connection and a second operating position which connects vice versa, the control valve having a floating position which connects both motor connections with the tank connection and the control valve having a locking position which separates both motor connections from the pump and tank connections, and further including two closing valves, each being connected between the control valve and a motor connection and each having a piston loaded by a spring located in a spring chamber, the spring chambers being pressure releasable, and including lifting valves for pressure release, the lifting valves being operated by a control pressure depending on the position of the control valve.
Dependencies are inferred from the claim text.