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Servo valve principle
A typical servo valve consists of a permanent magnet torque motor, a nozzle, a baffle, a valve plug, a valve housing and a control chamber (see photo). When the input coil into the current, the baffle moves to the right, so that the role of the right nozzle to enhance the throttle, the flow decreases, the right back pressure increases; while the left nozzle throttling effect decreases, the flow increases, the left back pressure drop . Valve force at both ends of the loss of balance, the spool then move to the left. High-pressure oil flow from S to C2, to the load. Load back to the oil flow through the C1 back to the tank, into the tank. The displacement of the spool is proportional to the input current of the torque motor. The hydraulic pressure acting on the spool is balanced with the spring force, so the differential current of the torque motor is proportional to the displacement of the spool at equilibrium. If the input current is reversed, then the flow is reversed. The table is the classification of servo valve. Servo valves are mainly used as actuators in electrohydraulic servo systems (see Hydraulic Servo System). In the servo system, hydraulic actuators with electrical and pneumatic actuators compared with fast, good output per unit weight, smooth transmission, anti-interference ability and so on. On the other hand, electrical components are often used when passing signals and correcting characteristics in servo systems. Therefore, modern high-performance servo systems are also used electro-hydraulic way, servo valve is the necessary components of this system. Servo valve structure is more complex, high cost, high quality and clean oil requirements. New servo valves are trying to overcome these shortcomings, such as the use of electrostrictive element servo valve, the structure is greatly simplified. Another direction is the development of special working oil (such as electrical viscous oil). This kind of working oil can change the viscosity coefficient under electromagnetic effect. The use of this property can be directly controlled by the electric signal oil flow. More keyword search: servo valve