Servo valve SM4-40(40)151-80/40-10-S205 is the core component of the oil motor in the EH oil system. It organically connects the oil motor and remote control, and organically combines electrical signals with the hydraulic system.

When the servo valve SM4-40(40)151-80/40-10-S205 has no electrical signal, the baffle is placed in the middle position and PL is equal to zero. When the electric signal is input to the torque motor to deflect the baffle and the pressure difference PL on both sides of the valve core is not zero, causing the valve core to shift, the supply oil and return oil flow into or out of the oil motor through their respective channels. When the oil motor moves, the LVDT feedback signal tends to be consistent with the valve position command signal. At this time, the current acting on the torque motor disappears, the baffle returns to the middle position under the action of the nozzle, the pressure difference at both ends of the slide valve is zero, and the slide valve returns to the original position under the action of the feedback needle until another input a signal current.

The main performance of servo valve SM4-40(40)151-80/40-10-S205 includes the following aspects:

1. Stable performance: The stable performance of the servo valve means that under certain working conditions, the servo valve can stably control the flow, pressure and direction of the hydraulic system to achieve stable work of the system.

2. Sensitive performance: The sensitive performance of the servo valve means that the servo valve can respond quickly and accurately to changes in the hydraulic system to meet the real-time requirements of the system.

3. Reliable performance: The reliable performance of the servo valve means that the servo valve can maintain good working condition without failure or malfunction during long-term use.

4. Adaptability: The adaptability of the servo valve means that the servo valve can adapt to different working environments and working conditions to meet the needs of different working conditions.

5. Accuracy performance: The accuracy performance of the servo valve refers to the accuracy with which the servo valve can control parameters such as flow, pressure, and direction in the hydraulic system to meet the system’s accuracy requirements.

Servo valve SM4-40(40)151-80/40-10-S205 provides system closed-loop control with the advantages of high position accuracy, repeatable speed curves, and predictable adjustment of force or torque. With pressure up to 350bar, the high-performance SM4 series servo can provide a wide range of flow output. The valve core and valve sleeve are made of quenched stainless steel to reduce wear and corrosion. The O-ring installed on the valve sleeve prevents the valve core from seizing and ensures smooth operation of the unit.