Applicable to Komatsu PC200-6 relief valve PC200-6 excavator safety valve 723-40-90100

Proportional solenoid valve

      The proportional solenoid valve generally regulates the opening of the valve through an external voltage signal, and is commonly used to regulate the flow of fluid through the valve.

     Electrical proportional valves are generally used to regulate and control the fluid outlet pressure, which is an important difference between them, one is to regulate the flow, the other is to regulate and control the pressure.

     The composition of the electrical proportional valve is generally composed of two proportional solenoid valves, pressure sensors and controllers, a proportional valve controls the inlet flow, another proportional valve controls the outlet flow, the sensor measures the pressure, and the controller controls the opening of the two proportional valves through feedback signals, so that the pressure in the middle chamber (also equal to the outlet pressure) is equal to the set value.

The overall structure of the full hydraulic excavator

          Hydraulic excavators mostly use double pump circuit constant power variable hydraulic system, most of which use constant power regulator to control two hydraulic pumps, and all working mechanisms are divided into two groups (see bottom map)
Manual mechanical operation valve or pilot system control operation valve to complete the job. In addition, in the bucket rod, bucket, boom operation, in order to improve the speed of two pumps combined flow.
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