In daily life, pneumatic butterfly valves are widely used in the self-adjusting air suspension of commercial cars, buses, rail vehicles, machinery equipment and building bases. The pneumatic butterfly valve is composed of air and, with small internal friction, will not affect the ability to isolate high-frequency vibration due to the inherent vibration of the ball valve itself. In addition, the ball valve has no metal to metal contact, so it can be soundproof and sound proof.

For the stiffness of ball valve: when designing the stiffness of ball valve, it can be selected by changing the internal pressure of the ball valve. The stiffness is roughly proportional to the internal pressure, so the stiffness can be selected very low as required. For a ball valve with a given size, the stiffness is variable, and it changes with the change of load, so the natural vibration frequency is almost constant under any load, Therefore, it can make the supported system have almost constant performance.
The ball valve is connected to the additional air chamber, but the natural vibration frequency of the pneumatic butterfly valve device is reduced to 0.5~3Hz. Under the action of any load, the ball valve can maintain a low and nearly equal vibration frequency. An orifice is added between the ball valve and the additional air chamber. When the spring load vibrates, the air passes through the orifice and loses energy, thus playing the role of vibration attenuation.
The body structure of the ball valve is soft, so it has a comprehensive vibration isolation effect in axial, transverse and rotary directions. The pneumatic butterfly valve is relatively cheap, easy to install and replace, simple to maintain, and does not need frequent maintenance and refueling.