Patent ID: 6250202
Filing Date: 2001-06-26
Classification: F15B

Abstract:
A hydraulic control arrangement with a directional control valve (13, 80) which is connected to an inlet line (34, 60) and to a discharge line leading to a tank (19) and from which a load line leads off to a hydraulic load, with a hydraulic pump (18, 75), by which pressure medium can be drawn from the tank (19) and discharged into the inlet line (34, 60), and with a two-way cartridge valve (52), which is constructed as a seat valve, is arranged in the inlet line (34, 60) and, in a closed position, isolates a second inlet line section (60) leading off from it to the directional control valve (13, 80) from a first inlet line section (34) running between it and the hydraulic pump (18, 75) and which has a control piston (54), with an annular opening surface (64) exposed to the pressure in the first inlet line section (34), with a central annular opening surface (65) exposed to the pressure in the second inlet line section (60), and with a closing surface (62), which can be subjected to the pressure in the first inlet line section (34) via a pilot valve (53) in a first position of the latter and can be relieved to the tank (19) via the pilot valve (53) in a second position of the latter, and wherein the second inlet line section (60) can be relieved to the tank (19) via the pilot valve (53) in the first position of the latter.