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Detailed Knowledge of Pneumatic Ball Valve

Pneumatic ball valve is a commonly used control element. It is evolved from a plug valve and has the same 90-degree rotation. The difference is that the plug body is a sphere with a circular through hole or channel passing through its axis. China Cast Steel Ball Valve Supplier mainly introduces the use and advantages of pneumatic ball valves, hoping to help you better apply products.
The use of pneumatic ball valve
The working principle of the Aerodynamic Ball Valve is to make the valve unblocked or blocked by rotating the valve core. Pneumatic ball valve switch is light, small in size, can be made into a large diameter, reliable in sealing, simple in structure, convenient in maintenance, sealing surface and spherical surface are often closed, not easy to be eroded by the medium, and it is widely used in various industries.
Pneumatic ball valve and plug valve belong to the same type of valve. Only its closing part is a ball. The ball rotates around the center line of the valve body to achieve opening and closing.
Pneumatic ball valves are mainly used in the pipeline to cut off fast, distribute and change the flow direction of the medium.


Aerodynamic Ball Valve

Advantages of pneumatic ball valve
1. The fluid resistance is small, and its resistance coefficient is equal to that of a pipe section of the same length.
2. Simple structure, small size and light weight.
3. It is tight and reliable. At present, the sealing surface material of the ball valve is widely used in plastics, with good sealing performance, and it has also been widely used in vacuum systems.
4. Convenient operation, rapid opening and closing, only need to rotate 90° from fully open to fully closed, which is convenient for remote control.
5. Convenient maintenance, simple structure of pneumatic ball valve, generally movable sealing ring, easy to disassemble and replace.
6. When fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, and the medium will not cause erosion of the valve sealing surface when the medium passes.
7. It has a wide range of applications, with a diameter ranging from a few millimeters to a few meters, and can be applied from high vacuum to high pressure.
8. Because the pneumatic ball valve power source uses gas, the pressure is generally 0.2-0.8MPa, which is relatively safe. If the pneumatic ball valve leaks, compared with hydraulic and electric, the gas can be discharged directly, which does not pollute the environment and has high safety.
9. Compared with manual and turbine rotating ball valves, pneumatic ball valves can be configured with large diameters. (Manual and turbine rotating ball valves are generally below DN300, and pneumatic ball valves can currently reach DN1200.)
Pneumatic ball valves have been widely used in petroleum, chemical, power generation, papermaking, atomic energy, aviation, rockets and other departments, as well as people's daily life.
Pneumatic ball valve can be divided according to the structure
1. Floating pneumatic ball valve
The ball of the pneumatic ball valve is floating. Under the action of the medium pressure, the ball can produce a certain displacement and press tightly on the sealing surface of the outlet end to ensure that the outlet end is sealed.
The floating pneumatic ball valve has a simple structure and good sealing performance, but the load of the ball bearing the working medium is all transmitted to the outlet sealing ring, so it is necessary to consider whether the sealing ring material can withstand the working load of the spherical medium. This structure is widely used in medium and low pressure ball valves.
2. Fixed ball pneumatic ball valve
The ball of the pneumatic ball valve is fixed and does not move after being pressed. The fixed ball valve is equipped with a floating valve seat. After receiving the pressure of the medium, the valve seat moves, so that the sealing ring is pressed tightly on the ball to ensure sealing. Bearings are usually installed on the upper and lower shafts of the sphere, and the operating torque is small, which is suitable for high pressure and large diameter valves.
In order to reduce the operating torque of the pneumatic ball valve and increase the reliability of the seal, oil-sealed ball valves have appeared in recent years. Special lubricating oil is injected between the sealing surfaces to form an oil film, which enhances the sealing performance and reduces the operation. Torque is more suitable for high-pressure and large-caliber ball valves.
Three, elastic ball pneumatic ball valve
The ball of the pneumatic ball valve is elastic. Both the ball and the valve seat sealing ring are made of metal materials, and the sealing specific pressure is very large. The pressure of the medium itself cannot meet the sealing requirements, and external force must be applied. This valve is suitable for high temperature and high pressure media.
The elastic sphere is made by opening an elastic groove on the lower end of the inner wall of the sphere to obtain elasticity. When closing the channel, use the wedge-shaped head of the valve stem to expand the ball and press the valve seat to seal. Loosen the wedge-shaped head before rotating the ball, and the ball will return to its original shape, so that there is a small gap between the ball and the valve seat, which can reduce the friction of the sealing surface and the operating torque.
Pneumatic ball valves can be divided into straight-through type, three-way type and right-angle type according to their channel position. The latter two ball valves are used to distribute the medium and change the flow direction of the medium.

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