Excavator accessories 225-0300 ratio solenoid valve construction machinery accessories

 Application of electro-hydraulic proportional valve in construction machinery hydraulic system diagram of a certain type of truck crane, only the relevant parts of the electro-hydraulic proportional valve are drawn in the diagram.

The machine uses 3 pieces of TECNORD TDV, 4/3 LM, LS/PC type proportional multi-way valve, load sensing oil line 3 spindle valves will be selected in the maximum pressure of 3 work 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 can achieve a certain energy saving.

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-way 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-way 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.