Ball valve, opening and closing parts (ball) driven by the stem, and around the axis of the ball valve for rotation.It can also be used for fluid regulation and control, in which the hard sealed v-ball valve has a strong shear force between its v-ball core and surfacing welded hard alloy metal seat, especially suitable for the medium containing fiber, tiny solid particles, etc.The multi-pass ball valve in the pipeline can not only flexibly control the media confluence, diversion, and flow direction switch, but also can close any channel to make the other two channels connected.Valves of this class shall generally be installed horizontally in the pipeline.Ball valve according to the driving mode is divided into: pneumatic ball valve, electric ball valve, manual ball valve.
Ball valve features:
I. wear resistance;Since the spool of the hard-sealed ball valve is alloy steel sprayed,
The seal ring is surfacing welded with alloy steel, so hard sealed ball valves do not cause too much wear on and off.(its hardness coefficient is 65-70) :
Ii. Good sealing performance;Because of the hard seal ball valve seal is manual grinding, until the valve core and seal ring is fully matched to use.So his sealing performance is reliable.
Three, light switch;Since the bottom of the sealing ring of the hard sealing ball valve USES a spring to make the sealing ring and the valve core tightly held together, so the switch is very light when the external force exceeds the preload of the spring.
Long service life: it has been widely used in petroleum, chemical industry, power generation, paper making, atomic energy, aviation, rockets and other sectors, as well as in People's Daily life.
Pneumatic ball valve simple and compact structure, reliable sealing, easy maintenance, sealing surface and the ball often in a closed state, not easy to be medium erosion, easy to operate and maintenance, suitable for water, solvent, acid and natural gas and other general working media, mainly used to cut or connect the medium in the pipeline, can also be used for fluid regulation and control.
Compared with other types of valves, pneumatic ball valves have angular stroke output torque, fast opening, stable and reliable, widely applicable, and the following advantages:
1, the thrust bearing reduces the friction torque of the valve stem, can make the long-term operation of the valve stem stable and flexible.
2. Anti-static function: spring is set between the ball, valve stem and valve body to export the static electricity generated in the switching process.
3, due to ptfe and other materials have good self-lubrication, and the friction loss of the ball is small, so the service life of the pneumatic ball valve is long.
4, small fluid resistance: pneumatic ball valve is all valve categories in the fluid resistance is small, even if the reduced diameter of the pneumatic ball valve, the fluid resistance is also quite small.
5, the stem seal is reliable: because the stem only makes the rotation movement and does not do the lifting movement, the packing seal of the stem is not easy to damage, and the sealing ability increases with the increase of the medium pressure.
6, seat sealing performance is good: the use of ptfe and other elastic materials made of the sealing ring, the structure is easy to seal, and the sealing capacity of pneumatic ball valve with the increase of the media pressure and increase.
7, the fluid resistance is small, the full diameter of the ball valve is basically no flow resistance.
8. Simple structure, small size and light weight.
9. Tight and reliable.It has two sealing surface, and the ball valve sealing surface material widely used all kinds of plastic, good sealing, can achieve complete sealing.It is also widely used in vacuum systems.
10, easy to operate, open and close quickly, high-performance ball valve from full open to full close as long as the rotation of 90°, easy to control from a distance.
11, maintenance is convenient, the ball valve structure is simple, seal ring is generally active, disassembly and replacement are more convenient.
12. When fully open or fully closed, the sealing surface of the ball and the seat is isolated from the medium. When the medium passes, it will not cause the erosion of the sealing surface of the valve.
13. Wide application range, ranging from a few millimeters in diameter to a few meters in diameter, from high vacuum to high pressure.
14, because the ball valve in the process of cleaning, so it can be used with suspended solid particles in the medium.
15, high processing accuracy, expensive, should not be used in high temperature, such as impurities in the pipeline, easy to be blocked by impurities, resulting in the valve can not be opened.