Ball valve, a valve whose hoist (ball) is driven by the valve stem and rotates around the axis of the ball valve. It can also be used for fluid regulation and control. Among them, there is a strong shear force between the V-shaped ball core of the hard sealed V-shaped ball valve and the metal valve seat of surfacing cemented carbide, which is especially suitable for media containing fibers, micro solid particles, etc. The multi-way ball valve can not only flexibly control the confluence, diversion and flow direction switching of media on the pipeline, but also close any channel to connect the other two channels. This type of valve should generally be installed horizontally in the pipeline. Ball valves are divided into pneumatic ball valves, electric ball valves and manual ball valves according to the driving mode.

Features of ball valve:

1、 Wear resistance; Because the valve core of hard sealed ball valve is spray welded with alloy steel,

The sealing ring is alloy steel surfacing, so the hard sealed ball valve will not produce too much wear when opening and closing. (its hardness coefficient is 65-70):

2、 Good sealing performance; As the seal of hard sealed ball valve is manually ground, it can not be used until the valve core is consistent with the sealing ring. So its sealing performance is reliable.

3、 Light switch; Since the bottom of the sealing ring of the hard sealed ball valve adopts a spring to hold the sealing ring tightly with the valve core, the switch is very light when the external force exceeds the preload of the spring.

4、 Long service life: it has been widely used in petroleum, chemical industry, power generation, paper making, atomic energy, aviation, rockets and other departments, as well as people's daily life.

The pneumatic ball valve has simple and compact structure, reliable sealing and convenient maintenance. The sealing surface and spherical surface are often closed, which is not easy to be eroded by the medium and easy to operate and maintain. It is suitable for general working media such as water, solvent, acid and natural gas. It is mainly used to cut off or connect the medium in the pipeline, and it can also be used for fluid regulation and control.

Compared with other types of valves, pneumatic ball valves have the advantages of angular stroke output torque, rapid, stable and reliable opening, wide application, and the following:

1. The thrust bearing reduces the friction torque of the valve rod, which can make the valve rod operate smoothly and flexibly.

2. Anti static function: a spring is set between the ball, valve rod and valve body to export the static electricity generated during the switching process.

3. Because PTFE and other materials have good self lubrication and small friction loss with the ball, the service life of pneumatic ball valve is long.

4. Small fluid resistance: pneumatic ball valve is a kind of valve with small fluid resistance in all valve classifications. Even for reduced diameter pneumatic ball valve, its fluid resistance is also quite small.

5. The valve rod seal is reliable: because the valve rod only rotates without lifting, the packing seal of the valve rod is not easy to be damaged, and the sealing capacity increases with the increase of medium pressure.

6. Good sealing performance of valve seat: the sealing ring made of elastic materials such as polytetrafluoroethylene is easy to seal, and the sealing capacity of pneumatic ball valve increases with the increase of medium pressure.

7. The fluid resistance is small, and the full bore ball valve basically has no flow resistance.

8. Simple structure, small volume and light weight.

9. Tight and reliable. It has two sealing surfaces, and the sealing surface material of the ball valve is widely used in various plastics, which has good sealing performance and can realize sealing. It has also been widely used in vacuum systems.

10. It is easy to operate and open and close quickly. The ball valve only rotates 90 ° from full open to full close, which is convenient for remote control.

11. The maintenance is convenient, the structure of the ball valve is simple, the sealing ring is generally movable, and it is convenient to disassemble and replace.

12. When it is fully open or closed, the sealing surface of the ball and valve seat is isolated from the medium. When the medium passes through, it will not cause the erosion of the sealing surface of the valve.

13. It has a wide range of applications, ranging from small to several millimeters and large to several meters, and can be applied from high vacuum to high pressure.

14. Because the ball valve is wiping in the opening and closing process, it can be used in the medium with suspended solid particles.

15. The processing precision is high, the cost is expensive, and it is not suitable for use in high temperature. If there are impurities in the pipeline, it is easy to be blocked by impurities, resulting in the valve cannot be opened.