Hydraulische Steuerung in Monoblockbauweise zum Heben und Senken einer Last mit mindestens zwei elektromagnetisch betätigbaren Proportionalwegeventilelementen

摘要

The invention concerns a hydraulic control system with at least two electromagnetic proportional two-way valve elements, a non-return valve and a pressure balance for raising the load, as the input element, independently of the load pressure. The proportional two-way valve elements are parallel to each other, the electromagnetic drives being disposed adjacent each other on the same side and in particular at the same level. A pressure balance piston is disposed coaxially adjacent a longitudinal slide of the first proportional two-way valve element in a bore which houses both valve elements. The longitudinal slide of the first proportional two-way valve element is supported on the housing via a spring. To this end, at least one component is guided by the pressure balance piston in order to adjust the pretension of a spring. The structural volume of the hydraulic control system is small. The individual valve elements are grouped close to one another and the individual slides, including their linkages, are disposed in a space-saving manner. In addition, individual connections are doubled to allow a greater volumetric flow to pass.