What are the advantages of pneumatic three-way ball valve?

Introduction of the pneumatic three-piece ball valve：

The pneumatic three-piece ball valve evolved from the globe valve. It has the same rotation of 90 degrees to mention the action, the difference is that the plug body is a sphere with a circular hole or channel through its axis. The ratio of the spherical surface to the passage port should be such that when the ball is rotated 90 degrees, all the spherical surfaces should be presented at the inlet and outlet, thus cutting off the flow.

The pneumatic three-piece ball valve can be closed tightly with only 90 degrees of air rotation operation and very little turning torque. The completely equal valve body cavity provides the medium with very little resistance and a straight flow path. Usually, it is considered that ball valves are most suitable for direct opening and closing use, but developments have designed them for throttling and flow control. The main feature of the ball valve is its own compact structure, easy to operate and maintain, suitable for general working media such as water, solvents, acids, and natural gas, but also for harsh working conditions of the media, such as oxygen, hydrogen peroxide, methane, and ethylene. The ball valve body can be integral or combined.

 

 

The pneumatic ball valve is a new type of valve that is widely used, it has the following advantages：

1. Small fluid resistance, its resistance coefficient is equal to the same length of the pipe section.

2. Simple structure, small volume, and lightweight.

3. Tight and reliable, the sealing surface material of the ball valve is widely used plastic, good sealing, and has been widely used in the vacuum system.

4. Easy to operate, open and close quickly, from fully open to fully closed as long as the rotation of 90 °, easy to control from a distance.

5. Easy maintenance, pneumatic ball valve structure is simple, the seal is generally movable, disassembly and replacement are relatively easy.

6. In the fully open or fully closed, the ball and seat sealing surface and media isolation, the media through, will not cause erosion of the valve sealing surface.

7. Wide range of applications, diameters from small to a few millimeters, large to several meters, and from high vacuum to high pressure can be applied.

Pneumatic three-piece ball valve has been widely used in various sectors such as petroleum, chemical, power generation, paper, atomic energy, aviation, rocket, and people's daily life.

8. Anti-static function: a spring is set between the ball, stem, and valve body, which can export the static electricity generated by the switching process. Actuator.

9. Stem sealing is reliable because the stem is only for the seemingly rotating transport without lifting movement, the stem packing seal is not easy to destroy, and the sealing capacity increases with the increase in pressure of the medium.

10. Good sealing performance of the valve seat, the use of PTFE and other elastic materials made of seals, the structure is easy to seal, and the valve sealing capacity of the ball valve increases with the increase in medium pressure.

11. The thrust bearing reduces the frictional torque of the stem, which can make the stem operate smoothly and flexibly for a long time.

12. Because of the good self-lubrication of PTFE and other materials, the friction loss with the ball body is small, so the ball valve has a long service life.

13. Under-mounted stem and stem head convex step to prevent the stem from ejecting, such as fire causing damage to the stem seal, the convex step and the valve body can also form a metal contact between them to ensure the stem seal.

14. Small fluid resistance, the ball valve is the smallest fluid resistance of all the valve types, even if the reduced ball valve, its fluid resistance is also quite small. The pneumatic ball valve is mainly used to cut off or connect the medium in the pipeline, but also used for fluid regulation and control, in several aspects such as the above compared with similar valves, the advantages are outstanding!

15. Pneumatic actuator performance, long life cycle, to ensure 2 million times the action. Adapting to frequent full load action, the pneumatic actuator can be precise and repeatable control, with 0.25% accuracy.

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Pneumatic three-piece ball valve realistic role：

Stainless steel pneumatic ball valve works by rotating the valve clutch to make the valve unobstructed or occluded. Pneumatic ball valve switch light, small size, can be made into a large caliber, reliable sealing, simple structure, easy maintenance, sealing surface and the spherical surface is often in a closed state, not easy to be eroded by the media, in various industries are widely used.

Pneumatic three-piece ball valve and plug valve is the same type of valve, only its closing piece is a ball, the ball around the body centerline for rotation to open, and close a valve.

A pneumatic three-piece ball valve in the pipeline is mainly used to cut off-speed, distribute and change the direction of media flow.

 

The pneumatic ball valve can be divided according to the form of structure：

1, floating pneumatic ball valve：

Stainless steel pneumatic ball valve ball is floating, under the action of media pressure, the ball can produce a certain displacement and tightly pressed on the sealing surface of the outlet end to ensure that the outlet end seal.

A floating stainless steel pneumatic ball valve has a simple structure and good sealing, but the ball bears the load of the working medium and is all transmitted to the outlet seal, so consider whether the seal material can withstand the working load of the ball medium. This structure is widely used in low and medium-pressure ball valves.

 

2, fixed ball pneumatic ball valve：

The stainless steel pneumatic ball valve ball is fixed, and under pressure does not produce movement. The fixed ball valve is with a floating seat, by medium pressure, the seat produces movement so that the seal is tightly pressed on the ball to ensure sealing. Usually equipped with bearings on the upper and lower shafts with the ball, the operating torque is small and suitable for high pressure and large diameter valves.

In order to reduce the operating torque of pneumatic ball valves and increase the reliability of the seal, and the emergence of oil-sealed ball valves, both between the sealing surface pressure injection of special lubricants to form a layer of oil film, that is, to enhance the sealing, but also to reduce the operating torque, more suitable for high-pressure large-diameter ball valves.

 

3, resilient ball pneumatic ball valve：

The ball of the pneumatic ball valve is resilient. Ball and seat seals are made of metal materials, sealing specific pressure is very large, relying on the pressure of the medium itself has not reached the requirements of sealing, external force must be applied. This valve is suitable for high-temperature and high-pressure media.

The resilient sphere is resilient by opening a resilient groove in the lower end of the inner wall of the sphere, and resilience is obtained. When closing the passage, the wedge-shaped head of the valve stem is used to make the ball rise open and the valve seat pressed to achieve sealing. Release the wedge before turning the ball, the ball then returns to its original shape, so that a small gap between the ball and the valve seat can reduce the friction of the sealing surface and operating torque.

Pneumatic ball valves can be divided into straight-through, three-way, and right-angle types according to their passage positions. The latter two types of ball valves are used to distribute the medium and change the flow direction of the medium.

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