Introduce for ball valves
Synopsis for ball valve:
Ball valve is available in the 1950 s, with the rapid development of science and technology, the continuous improvement of production technology and product structure, in just 40 years, has rapidly developed into a kind of main valve class.In western developed industrial countries, the use of the ball valve is constantly rising year by year.
In our country, the ball valve is widely used in petroleum refining, long pipeline, chemical industry, paper making, pharmacy, water conservancy, electric power, municipal, industries such as steel, holds the pivotal status in the national economy.It is 90 degrees of rotation movement, the cock body for a sphere, a round hole or tunnel through its axis.
Advantages for ball valve:
Ball valve in the line is mainly used for cutting, distribution, and change the flow direction of medium, it just has to rotate 90 degrees of operating and small rotational torque can be closed tightly.Ball valve is suitable to do the most switch, cut-off valve, v-shaped ball valve.Electric valves in addition to the pipeline parameters should be paid attention to, still should pay special attention to the use of environmental conditions, due to the electric valve electric actuator is a mechanical and electrical equipment, in the state of its use by the use of impact on the environment.Often state, electric ball valves, butterfly valves use pay special attention to in the following environment.wear resistance;As a result of the hard seal ball valve ball is alloy spray welding,
Three type ball valve sealing ring is alloy steel welding, so hard seal ball valve when the switch does not produce too much wear and tear.(its hardness coefficient for 65-70) :
2.Good sealing performance;Because of the hard sealing ball valve's sealing is using artificial grinding, until the valve core and seal perfectly before using.So he sealed performance is reliable.
Three;Light switch;Due to adopting the spring hard seal ball valve at the bottom of the sealing ring seal and valve core embrace together tightly, so in the outside powers over spring pre-tightening force when the switch is very light.
Four;Long service life, has been widely used in petroleum, chemical, power, papermaking, atomic energy, aviation, rockets and other departments, as well as People's Daily life.
Pneumatic ball valve structure is compact, reliable sealing, simple structure, convenient maintenance, sealing surface and the spherical often in the closed state, not easily be medium erosion, easy operation and maintenance, and is suitable for water, solvents, acids and generally working medium, such as natural gas is mainly used for cutting or on line in the medium, can also be used to adjust and control of the fluid.
Compared with other type valve, pneumatic ball valve has a quarter-turn output torque, start quickly, stable and reliable, applicable widely, and the following several advantages.
1, the thrust bearings reduce stem friction torque, can make the valve stem long smooth and flexible operation.
2, anti-static function: in a sphere, the valve stem and valve body between spring, will be generated switching process of electrostatic export.
3, such as ptfe material has good self-lubrication, with ball friction loss is small, so the pneumatic ball valve of long service life.
4, fluid resistance small, pneumatic ball valves are classified all valves fluid resistance in the smallest one, even the pneumatic ball valve, reducing the fluid resistance is small.
5, reliable stem seal: due to the valve stem will only be used as the rotation without lifting movement, the valve stem packing seal is not easy to damage, and sealing ability increases as the medium pressure increases.
6, seat sealing performance is good: use the sealing ring made of elastic material, such as teflon structure is easy to be sealed, and pneumatic ball valve sealing ability increases as the medium pressure increases
Classify for ball valves:
Ball valve points are: the floating ball valve, the fixed ball ball valve, track ball, v-shaped ball valve, three-way ball valve, stainless steel ball
Ball valve floating ball valve, cast steel ball valves, forged steel ball valve, sulfur discharge ball valve, ball valve, pneumatic ball valves, electric ball valves, card sets of ball valves, welding ball valve.
According to the shell/classification, the main valve can be divided into:
1. Valve: metal materials such as carbon steel, alloy steel, stainless steel valve, cast iron valve valve, the titanium alloy valve and monel valve, copper alloy, aluminum alloy, lead alloy valve valve valve, etc.
2. The metal valve body lining: such as rubber lining, fluorine-butterfly valves, valve lining lead, lining plastic valves, valve lining enamel valve.
3. Valve non-metallic materials: such as ceramic, glass, plastic valve valve.
Domestic manufacturer of ball valve, connection size are not unified.Main points of the following categories:
Ball valve ball is floating, under the effect of medium pressure, the fitness ball produce certain displacement and compression at the outlet seal surface, guarantee the outlet seal.