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The Pneumatic ball valve is a ball valve equipped with a pneumatic actuator. The pneumatic actuator performs relatively fast, and the fastest switching speed is 0.05 seconds / time, so it is usually also called the pneumatic quick cut-off ball valve. Pneumatic ball valve is usually configured with various accessories, such as solenoid valve, air source processing triad, limit switch, positioning device, control box, etc., in order to achieve in-situ control and remote centralized control, in the control room can control the valve switch, do not need to run to the scene or high altitude and dangerous manual control, to a large extent, save human resources and time, improve safety. Pneumatic Control Ball Valve according to the material classification are: stainless steel pneumatic ball valve, plastic pneumatic ball valve, carbon steel pneumatic ball valve, cast iron pneumatic ball valve, etc. According to the number of branches classification two pneumatic ball valve, three pneumatic ball valve, four pneumatic ball valve.
Pneumatic ball valve is evolved by the plug valve. It has the same rotating 90-degree action, and the difference is that the plug body is spherical, with circular through-holes or channels passing through its axis. The ratio of the sphere and the passageway should be such, that when the ball rotates by 90 degrees, the ball should all be presented at the entrance and exit, thus truncating the flow. These valves can be installed anywhere in the pipe.
The pneumatic ball valve can only need to be tightly closed with a pneumatic actuator with air source rotating by 90 degrees and with a very small rotational torque. The completely equal cavity in the valve body provides little resistance to the medium. Ball valves are generally considered the most suitable for direct opening and closing, but recent developments have designed them to throttle and control flow. The main feature of the ball valve is its own compact structure, easy to operate and repair, suitable for water, solvent, acid and natural gas, but also suitable for poor working conditions, such as oxygen, hydrogen peroxide, methane and ethylene. Ball valve body can be integral or combined.
Application: The working principle of the pneumatic ball valve is by rotating the valve core to make the valve smooth or blocked. Pneumatic ball valve switch is light, small volume, can be made into a large diameter, reliable sealing, simple structure, convenient maintenance, sealing surface and spherical surface is often in a closed state, not easy to be eclipsed by the medium, has been widely used in various industries.
Pneumatic ball valve and plug valve are the same type of valve, only its closing part is a sphere, the sphere around the center line of the valve body for rotation to achieve the open, closed type of a valve. Pneumatic ball valve is mainly used in the pipeline to cut off the speed quickly, distribute and change the flow direction of the medium. Pneumatic ball valve is a new type of valve widely used in recent years. It has the following advantages:
1． Fluid resistance is small, and its resistance coefficient is equal to the pipe segment of the same length.
2． Simple structure, small size, light weight.
3． Tight and reliable, the current ball valve sealing surface material is widely used plastic, good sealing, in the vacuum system has also been widely used.
4． Easy to operate, quick opening and closing, from full open to full close as long as the rotation of 90, easy to long-distance control.
5． Convenient maintenance, the pneumatic ball valve structure is simple, the sealing ring is generally active, disassembly and replacement are more convenient.
6． In full opening or full closure, the sealing surface of the sphere and the valve seat is isolated from the medium. When the medium passes through, it will not cause the erosion of the valve sealing surface.
7． A wide range of applications, from the diameter to a few millimeters, large to a few meters, from high vacuum to high pressure can be applied.
8. Because the pneumatic ball valve power source is a gas, generally 0.2-0.8MPa pressure, relatively safe. If the pneumatic ball valve leaks air, relative to the liquid and electric operation, the gas can be directly discharged, with no pollution to the environment, and has a high safety.
9. Compared to manual and turbine rotating ball valves, pneumatic ball valves can be configured with large caliber, (manual and turbine rotating ball valves are generally below DN300 caliber, pneumatic ball valves can currently reach DN1200 caliber).
Pneumatic ball valve has been widely used in petroleum, chemical industry, power generation, paper making, atomic energy, aviation, rocket and other departments, as well as people's daily life.
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July 19, 2022
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