Characteristics of ball valves

Characteristics of ball valves

Ball valve, a valve in which the opening and closing parts (balls) are driven by the stem and rotate around the axis of the ball valve. It can also be used for fluid regulation and control, in which the hard seal V-ball valve V-ball spool and hard-faced carbide metal seat has a strong shear force, especially suitable for media containing fibers and tiny solid particles. Multi-way ball valves in the pipeline can not only flexibly control the combined flow of media, diversion and flow direction switching, but also can close any one channel to connect the other two channels. This 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 method.

　　The characteristics of the ball valve:

　　1. Wear resistance; as the spool of hard seal ball valve is alloy steel spray welding, the

　　sealing ring is alloy steel surfacing, so hard seal ball valve will not wear too much when opening and closing. (Its hardness coefficient is 65-70).

　　Secondly, the sealing performance is good; because the hard seal ball valve is manually ground, in the spool and seal ring matching before use. So his sealing performance is reliable.

　　Thirdly, the switch is light; because the sealing ring of hard seal ball valve adopts a spring at the bottom to hold the sealing ring and spool tightly together, when the external force exceeds the preload of the spring, the switch is very light.

　　Fourth, 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 invention has a simple and compact structure, reliable sealing and easy maintenance. The sealing surface and the spherical surface tend to be closed and are not easily eroded by the medium. Easy to operate and maintain. Applicable to water, solvents, acids, natural gas and other general working media, mainly used to cut off or connect the medium in the pipeline, but also can be used for fluid regulation and control.

　　Compared with other kinds of valves, pneumatic ball valves have the advantages of large angular stroke output torque, rapid opening, stable and reliable, and widely used, and have the following advantages:

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

　　2. Anti-static function: there is a spring between the ball, valve stem and valve body, which can export the static electricity generated in the process of opening and closing.

　　3. As PTFE and other materials have good self-lubricating properties, the friction loss with the ball is small, and the pneumatic ball valve has a long service life.

　　4. Low fluid resistance: pneumatic ball valve is the smallest fluid resistance of all valve categories, even the diameter of the pneumatic ball valve is reduced also has a low fluid resistance.

　　5. Reliable stem sealing: Because the valve stem only rotates without lifting, the stem packing seal is not easy to damage, sealing capacity increases with the increase in medium pressure.

　　6. Good sealing performance of the valve seat: PTFE and other elastic materials made of seals are easy to seal, pneumatic ball valve sealing capacity increases with the increase in media pressure.

　　7. Fluid resistance is small, full-caliber ball valve basically no flow resistance.

　　8. simple structure, small size, light weight. 9. tight and reliable. It has two sealing surfaces. The sealing surface material of the ball valve is widely used various plastics with good sealing performance. It is also widely used in vacuum system.

　　10. Simple operation, quick opening and closing, the ball valve can only rotate 90 degrees from fully open to fully closed, which is convenient for remote control.

　　11. Convenient maintenance, the ball valve structure is simple, the seal ring can be moved, easy to disassemble and replace.

　　12. Fully open or fully closed, the ball and the sealing surface of the valve seat and the media isolation, the passage of the media will not cause erosion of the valve sealing surface.

　　13. Wide range of application, the diameter ranges from a few millimeters to several meters, can be used in high vacuum to high pressure.

　　14. Ball valves can be used in the suspension of solid particles in the medium, because it can be wiped in the process of opening and closing.

　　15. High processing precision, expensive manufacturing cost, not suitable for high temperature use. If there are impurities in the pipeline, it is easy to be clogged by impurities, resulting in the valve not opening.