Classification of proportional valve control methods:

1. electro-hydraulic type electro-hydraulic type refers to the proportional valve that uses the structure of torque motor and nozzle stopper as the pilot control stage.

2. Electromagnetic type electromagnetic type refers to the proportional solenoid as an electrical and mechanical conversion element of the proportional valve, the proportional solenoid will input the current signal into force, displacement mechanical signal output. And then control the pressure, flow and direction of parameters

3. Electric type Electric type refers to the use of DC servo motor as an electrical and mechanical conversion element of the proportional valve, DC servo motor will input the electrical signal. The DC servo motor converts the input electrical signal into rotational movement speed, and then through the reduction device and transformation mechanism such as screw nut, rack and pinion or gear cam, the output force and displacement, and further control the hydraulic parameters.

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