Excavator solenoid valve 25-220992hydraulic pump proportional solenoid valve

Type of proportional valve
The classification according to the proportional valve control mode refers to the classification according to the electrical and mechanical conversion mode in the pilot control valve of the proportional valve, and the electrical control part has a variety of forms such as proportional electromagnet, torque motor, DC servo motor, etc.
(1) Electromagnetic type
The electromagnetic type refers to the proportional valve using a proportional electromagnet as an electric-mechanical conversion element, and the proportional electromagnet converts the input current signal into the force and displacement mechanical signal output. Then control the pressure, flow and direction parameters.
(2) Electric type
The electric type refers to the proportional valve using the DC servo motor as the electric-mechanical conversion element, and the DC servo motor will input the electrical signal. Convert to rotating motion speed, and then through the screw nut, gear rack or gear CAM reduction device and change mechanism, output force and displacement, further control of hydraulic parameters.
(3) electrohydraulic
The electro-hydraulic type refers to the proportional valve with the structure of torque motor and nozzle baffle as pilot control stage. Input different electrical signals to the torque motor, and output displacement or angular displacement through the baffle connected with it (sometimes the armature of the torque motor is the baffle), change the distance between the baffle and the nozzle, so that the oil flow resistance of the nozzle is changed, and then control the input parameters.