Ball valve, the opening and closing member (sphere) 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. The hard-sealed V-ball valve has a strong shear force between the V-shaped core and the metal seat of the hard-welded carbide alloy. It is especially suitable for fiber-containing, micro-solid particles. Etc. The multi-way ball valve not only can flexibly control the confluence, splitting, and flow direction switching of the medium, but also can close any channel and connect the other two channels. This type of valve should generally be installed horizontally in the pipeline. Ball valves are classified according to the driving method: pneumatic ball valve, electric ball valve, manual ball valve.
Ball valve features:
1、Wear resistance; since the valve core of the hard seal ball valve is alloy steel spray welding, the seal ring is alloy steel surfacing, so the hard seal ball valve does not cause too much wear when switching. (It has a hardness coefficient of 65-70):
2、The sealing performance is good; since the sealing of the hard-sealed ball valve is manual grinding, it can be used until the valve core and the sealing ring are completely matched. Therefore, his sealing performance is reliable.
3、The switch is light; since the bottom of the seal ring of the hard seal ball valve uses a spring to hold the seal 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, power generation, papermaking, atomic energy, aviation, rocket and other departments, as well as people's daily life.
The pneumatic ball valve is simple and compact in structure, reliable in sealing, convenient in maintenance, and the sealing surface and the spherical surface are often closed, which is not easily eroded by the medium, easy to operate and maintain, and is suitable for general working medium such as water, solvent, acid and natural gas, and is mainly used for cutting off. Or turn on the medium in the pipeline, or use it for fluid regulation and control.
Compared with other types of valves, pneumatic ball valves have angular stroke output torque, which is quick, stable and reliable, and is suitable for a wide range of applications, as well as the following advantages:
1、The thrust bearing reduces the friction torque of the valve stem, which makes the valve stem smooth and flexible for long-term operation.
2、Anti-static function: a spring is arranged between the ball, the valve stem and the valve body to discharge the static electricity generated during the switching process.
3、Since the material such as polytetrafluoroethylene has good self-lubricating property and the friction loss with the sphere is small, the service life of the pneumatic ball valve is long.
4、Low fluid resistance: Pneumatic ball valves are the least fluid resistance of all valve classifications. Even for reduced diameter pneumatic ball valves, the fluid resistance is quite small.
5、The valve stem seal is reliable: since the valve stem only rotates and does not move up and down, the packing seal of the valve stem is not easily damaged, and the sealing capacity increases as the medium pressure increases.
6、The sealing performance of the valve seat is good: the sealing ring made of elastic material such as Teflon is easy to seal, and the sealing ability of the pneumatic ball valve increases with the increase of the medium pressure.
7、The fluid resistance is small, and the full-bore ball valve has substantially no flow resistance.
8、The structure is simple, small in size and light in weight.
9、Tight and reliable. It has two sealing faces, and the sealing surface material of the ball valve is widely used in various plastics, and has good sealing performance and can achieve complete sealing. It has also been widely used in vacuum systems.
10、It is easy to operate and quick to open and close. The high-performance ball valve rotates 90° from full opening to full closing, which is convenient for long-distance control.
11、The maintenance is convenient, the ball valve has a simple structure, and the sealing ring is generally movable, and the disassembly and replacement are relatively convenient.
12、When fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, and the medium does not cause erosion of the sealing surface of the valve.
13、Wide range of applications, from small to a few millimeters, up to a few meters, from high vacuum to high pressure can be applied.
14、Since the ball valve is wiping during opening and closing, it can be used in a 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. For example, there are impurities in the pipeline, which are easily blocked by impurities, and the valve cannot be opened.