Today, Dongfeng's Xiaobian takes you to learn about pneumatic butterfly valves.
The two ends of the pneumatic butterfly valve capsule need to be connected with two plates to form a compressed air chamber. The cable itself does not provide the bearing capacity, but the compressed air is filled with capsules. Generally speaking, the number of crimp capsules is usually 1-3. If the requirements are different, 4 or more crimp capsules can be designed and manufactured, which can be superimposed by two pneumatic butterfly valves under certain conditions. There are five flange sealing forms at the end of pneumatic butterfly valve and connecting plate: LHF, JBF, GF, HF and ZF.
What are the three types of pneumatic butterfly valve connections?
1. Looper flange connection mode: the size of pneumatic butterfly valves at both ends is much smaller than the maximum outer diameter of the winding bag, so it is not necessary to use special flange rings and common end plates for fixed connection;
2. Self sealing type: self sealing without flange connection pressure enters the end plate filled with compressed air
3. Fixed flange connection type: the edge size at both ends of the pneumatic butterfly valve is equal to or slightly less than the maximum outer diameter of the crankshaft. After drilling several holes, use the blue ring to fasten the connection with the end plate.
When the pneumatic butterfly valve is assembled into the rear pneumatic butterfly valve of the assembly, compressed air is charged into the pneumatic butterfly valve. For more information on the use of pneumatic butterfly valves in industry, please visit the official website of Shanghai Dongfeng Pump Valve Factory: //www.dongfengfamen.com/
1. Pneumatic butterfly valve: It is a high elastic body made of common materials. The elastic modulus of the ball valve is very small, and the elastic deformation of the ball valve is large to absorb shock and vibration. It can bear multiple loads at the same time, but its resistance to high temperature and oil is worse than that of steel ball valve. If there are special requirements, it can be made into oil resistant. The product has good damping effect, small resonance field, long service life, low cost and good cold resistance. Good air tightness, waterproof and electrical insulation are good choices for vibration reduction.
2. Composite ball valve: composed of high-quality vulcanized and metal spiral ball valve and its outer package. Metal ball valve and ball valve are integrated to overcome the shortcomings of metal ball valve, such as high rigidity, high working noise, small bearing capacity, poor appearance, mechanical and other functions of the ball valve, high load, large deformation and other advantages, better vibration and noise reduction effect, stable operation, and short resonance range.
1. Surface layer: protect the carcass, resist various external environmental pollution and seal;
2. High strength skeleton layer: control tension and bear load pressure;
3. Property inner layer: It can seal the compressed air in the air chamber and bear the air pressure. Pneumatic butterfly valve upwind and. point
1. Variability selection of ball valve height, bearing capacity and ball valve stiffness:
When in use, the height, bearing capacity and stiffness of the ball valve can be widely selected to obtain its soft ball valve performance.
Height of ball valve: height control valve can be used to properly control the height of pneumatic butterfly valve according to the use requirements, and maintain a certain height when the load on the spring changes.
Bearing capacity: for pneumatic butterfly valves of the same size, different bearing capacity can be obtained by changing the internal pressure, which is roughly proportional to the internal pressure. This makes it possible for a unified pneumatic butterfly valve to adapt to various load requirements.
Ball valve stiffness: when designing the stiffness of the pneumatic butterfly valve, it can be selected by changing the internal pressure of the ball valve. The stiffness is roughly proportional to the internal pressure. Therefore, the stiffness can be selected very low as required. For an automobile air 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 function.
1. The natural vibration frequency of the pneumatic butterfly valve is relatively low, but the natural vibration frequency of the pneumatic butterfly valve device is reduced to 0.5~3Hz. Under any load, the pneumatic butterfly valve can maintain a low and nearly equal vibration frequency.
2. High frequency vibration isolation and good noise isolation effect
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 pneumatic butterfly valve has no metal to metal contact, so its noise isolation and anti noise effect are very good.
3. The damping effect of available air
An orifice is added between the pneumatic butterfly valve and the additional air chamber. When the spring-loaded load vibrates, the air flows through the orifice and has energy loss, thus playing the role of vibration attenuation.
4. Long service life
The fatigue resistance of pneumatic butterfly valve is many times better than that of metal ball valve. For the fatigue test with the ball valve in the pneumatic butterfly valve suspension system of the vehicle, the steel plate ball valve was broken after only hundreds of thousands of times of vibration, while the pneumatic butterfly valve was still intact after 5 million times of vibration with amplitude of 40mm and frequency of 2.7Hz (160 times/min).
5. Body structure
The body structure of the pneumatic butterfly valve is soft, so it has a comprehensive vibration isolation effect in axial, transverse and rotary directions.
6. Manufacturing and installation
The valve is relatively inexpensive, easy to install and replace, and simple to maintain, without frequent inspection and refueling.