Classification of Dongfeng Pneumatic Ball Valves
Pneumatic ball valve is an ideal vibration isolation element. Pneumatic ball valve is a non-metallic ball valve that adds pressure air into a flexible closed container and uses the nonlinear restoring force of air compression to achieve vibration isolation and buffering. It has excellent nonlinear hardness, so it can effectively limit amplitude, avoid resonance and prevent shock. The natural frequency of the pneumatic ball valve vibration isolation system can be designed to be very low, even below 1Hz, while the natural frequency of the vibration isolator is generally 5-7Hz. Therefore, the vibration isolation efficiency of pneumatic ball valve is much higher than that of other vibration isolation elements, and it can isolate low-frequency vibration The pneumatic ball valve vibration isolation system is easy to implement active control. As a vibration isolation element with adjustable nonlinear static and dynamic stiffness and damping, the pneumatic ball valve is more and more widely used.
Classification of pneumatic ball valves
At present, the classification methods of pneumatic ball valves at home and abroad are very different, which are roughly as follows:
（1） Classification according to the number of curvature of cysts
The pneumatic ball valve is divided into single (one), double (two), three,..., n curves according to the number of curves of the bladder, as shown in Figure 1-3 and Figure 1-4. With the increase of curvature, the stiffness decreases, and the natural frequency of the pneumatic ball valve vibration isolation system also decreases accordingly. However, this not only brings trouble to the manufacturing, but also causes the elastic instability of the capsule, so generally only 4 coils are used.
（2） Classification by structure type
1. Classification in German Pneumatic Ball Valve:
Capsule type pneumatic ball valve: tire type [Figure 1-3 C]
Flat type [Figure 1-3 A, B
Earlobe type [Fig. 1-4 B]
2. Classification of China:
Pneumatic ball valve: 1. Bag type pneumatic ball valve [Figure 1-2, 1-3]
2. Restraining diaphragm pneumatic ball valve [Fig. 1-4 A]
3. Free diaphragm pneumatic ball valve [Fig. 1-4 B]