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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 part related to the electro-hydraulic proportional valve is drawn. The machine adopts 3 pieces of TECNORD DV-4/3 LM-LS/PC proportional multi-way valve, the load sensing oil line in the 3 shuttle valve will be the maximum pressure of 3 work loads selected to the remote control port of the relief valve, adjust the relief pressure of the relief valve, so that the output pressure of the hydraulic pump just meet the needs of the system load can be. Thus to achieve a certain purpose of energy saving. The pressure compensation oil circuit makes the flow through each valve only related to the opening of the valve, and has nothing to do with the load it bears, and has nothing to do with the load borne by other valves, so as to achieve the purpose of controlling the load speed 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 hydraulic direction change valve is controlled through the shuttle valve.