TM70302 proportional solenoid valve Excavator solenoid valve

An application example of electro-hydraulic proportional valve in construction machinery
A hydraulic system diagram of a certain type of truck crane, in which only the relevant part of the electro-hydraulic proportional valve is drawn. The machine adopts three TECNORDTDV-4/3 LM-LS/PC proportional multi-way valve, the load sensing oil line in the three spindle valves will be selected in the maximum pressure of the three working loads to the remote control port of the relief valve, adjust the relief valve pressure, so that the output pressure of the hydraulic pump just meet the needs of the system load, to achieve a certain energy saving purpose. The pressure compensation oil circuit makes the flow of each valve only related to the opening of the valve, and has nothing to do with the load, and the load borne by the valve plate has nothing to do with it, so that the load speed can be controlled at will under any load.
An example of manual and electro-hydraulic proportional pilot control of a bulldozer shovel. When the two-position three-way solenoid valve is not energized, the pilot pressure is connected with the manual decompression pilot valve, and the shuttle valve selects the pressure from the manual pilot valve to control the hydraulic direction change valve; When the two-position three-way solenoid valve is energized, the pilot control pressure oil leads to the three-way proportional decompression pilot valve, and the shuttle valve controls the hydraulic direction change valve.

The working principle, structure and characteristics of the electro-hydraulic proportional valve are briefly introduced, and the load sensing and pressure compensation principle of the proportional valve are analyzed and studied. The different applications of electro-hydraulic proportional valve, especially in the pilot control and remote control of construction machinery, are discussed. Electro-hydraulic proportional valve is of great significance to simplify the operation of construction machinery, improve the efficiency and accuracy of operation, and realize the intelligent operation
And the increasing scope of application will make the technical level of construction machinery products to a greater extent,