Rexroth Hydraulic Pumps - Introduction to the Classification of Proportional Valves

Create Date: 2024-8-30 12:03:23|Source: Rexroth/Rexroth

The classification of proportional valve control mode refers to the classification of the electrical-mechanical conversion mode in the pilot control valve of the proportional valve, and its electrical control part has various forms such as proportional solenoids, torque motors, DC servo motors, etc.

(1) Electromagnetic type Electromagnetic type refers to the proportional valve that uses a proportional electromagnet as an electrical mechanical conversion element, and the proportional electromagnet converts the input current signal into a force and displacement mechanical signal output. Parameters such as pressure, flow and direction are then controlled.

(2) Electric type Electric type refers to the use of DC servo motor as a proportional valve of electrical and mechanical conversion elements, and the DC servo motor will input the electrical signal. It is converted into a rotational motion speed, and then through a reduction device and a conversion mechanism such as a screw nut, rack and pinion or gear cam, the output force and displacement are used to further control the hydraulic parameters.

(3) Electro-hydraulic type Electro-hydraulic type refers to the proportional valve with the structure of torque motor and nozzle baffle as the pilot control level. 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 transmission parameters.
Rexroth Hydraulic Pumps - Introduction to the Classification of Proportional Valves

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