CVSA valve, abbreviated as CVSA valve, is a continuous variable servo valve. Its input is the current from the suspension control module; In normal operating procedures, this current level is between 0.3 A (soft damping) and 1.6 A (hard damping) to provide internal coil output current, achieving the desired working pressure inside the shock absorber working cylinder. If any type of control module fails, no current will be provided to the coil, and the valve will activate the safety mode at this time. In this case, there is no continuous variable damping, only ordinary damping effect is output.