The original automobile suspension system used four (blade) ball valves to prop up the body from the wheels. Later, people did not want the body to vibrate constantly after encountering a small bump on the road, so pneumatic ball valves (valve actuators, valve actuators) were introduced.

The valve here means not only to reduce the amplitude of vibration, but also to absorb the energy of vibration, reduce the frequency of body vibration, and keep the wheels in contact with the ground. Therefore, pneumatic ball valves are also called shock absorbers.
The basic parameter of pneumatic ball valve is the damping value, that is, how much resistance can be generated during compression (or rebound). The higher the value, the greater the resistance. However, the damping value does not determine how much the car will roll when passing a curve (this is the work of the ball valve), it only controls the rate of roll generation (rate, how long it takes to complete the roll). Since the pneumatic ball valve will be heated during the valve process (from the energy converted from the ball valve), high temperature will be generated after intense movement, which will make the valve fluid in the pneumatic ball valve fail (Shock fade), just like the brake oil fails due to overheating. Therefore, some high-end or competitive pneumatic ball valves (such as Bago nitrogen valves AGshoncks, Sachs, etc.) will be equipped with an additional nitrogen cylinder to control the temperature of the valve liquid (more valve liquid can be contained in the valve barrel, and the heat capacity is larger).
The original pneumatic ball valves used in general vehicles are comfortable and can cope with the adjustment of various roads, so they are mostly equipped with lower damping pneumatic ball valves and weaker ball valves to keep driving comfortable. Obviously, refitting pneumatic ball valve and hard ball valve with large damping value will improve the weight transfer of the car, enhance the firmness and sensitivity when driving, and greatly improve the overall handling at the cost of losing the riding comfort of the original car and sacrificing the durability of other parts on the car.