[Details] How to select the applicable model according to the classification of pneumatic ball valves?
Pneumatic ball valve is an ideal vibration isolation element. As a vibration isolation element with adjustable nonlinear static and dynamic stiffness and damping, pneumatic ball valves are used more and more widely. Today, I will give a detailed explanation on the 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]
other
Bag type pneumatic ball valve The bag type pneumatic ball valve is a lantern shaped structure made of membrane, which can be one section or several sections connected in series, and is called single curve, double curve or multi curve bag type pneumatic ball valve respectively. Metal rims are embedded between each section to bear the effect of internal pressure and tension.
Diaphragm pneumatic ball valve: the structure of the diaphragm pneumatic ball valve is to place a membrane between the metal outer cylinder and the inner cylinder, or between the cylinder cylinder and the piston, and realize the overall expansion and contraction through the deformation of the membrane. Appropriate inclination or curved surface shall be given in advance on the inner wall of the outer cylinder and the outer wall of the inner cylinder, according to which the membrane can deform along the wall when it expands and contracts, and the pressure area changes with the deformation. This enables us to obtain the properties that are very soft at the rated height but become hard at large displacement, that is, proper nonlinear elasticity. The membrane pneumatic ball valve is divided into the constrained membrane type and the free membrane type.
（3） Classification according to whether the angle changes
1. The pneumatic ball valve with only the internal angle changed and the external angle unchanged is called the internal angle modified pneumatic ball valve;
2. The pneumatic ball valve with only the external angle changed and the internal angle unchanged is called the external angle modified pneumatic ball valve;
3. The pneumatic ball valve with both internal and external angles changed is called double angle changing pneumatic ball valve;
4. The pneumatic ball valve whose internal and external angles do not change is called the constant angle pneumatic ball valve.
Figure 1-3 Bag Model of Bag type Pneumatic Ball Valve
A double curve, B triple curve, C single curve