Ball valve in the 20th century, 50 years, with the rapid development of science and technology, production technology and product structure of continuous improvement, in a short period of 50 years, has rapidly developed into a major valve class. In Western developed countries, the use of ball valves is increasing year by year.
The ball valve is mainly used in the pipeline to cut, distribute and change the direction of flow of the media, it only needs to rotate 90 degrees of operation and a small turning torque can be closed tight. Ball valve is most suitable for the switch, cut off the valve to use.
Since the ball valve is usually made of rubber, nylon and polytetrafluoroethylene as the valve seat sealing material, its use temperature is limited by the valve seat sealing material. The closing effect of the ball valve is to rely on the metal sphere in the role of the medium, between the plastic valve seat to complete each other (floating ball valve). Seat ring in a certain contact pressure, the local area of plastic deformation occurred. This deformation can compensate for the ball manufacturing accuracy and surface roughness, to ensure that the ball valve sealing performance.
And because the ball valve seat seal is usually made of plastic, so the choice of ball valve structure and performance, to consider the ball valve fire and fire, especially in the petroleum, chemical, metallurgical and other departments, in the flammable, explosive medium The use of ball valves in equipment and piping systems should also pay attention to fire and fire.
Ball valve, forged steel ball valve, ash ball valve, anti-sulfur ball valve, card ball valve, ball valve, ball valve, ball valve, ball valve, ball valve, ball valve, Welding ball valve.
Ball valve features
1. has the lowest flow resistance (actually zero).
2. In the absence of lubricant work will not be stuck, it can be reliably applied with corrosive media and low boiling point liquid.
3. In the larger pressure and temperature range, can achieve 100% seal.
4. Can achieve ultra-fast opening and closing, some structure of the opening and closing time is only 0.05 ~ 0.1s, to ensure that can be used in the test bed automation system. Quick start and close the valve, the operation without impact.
5. Ball-type closure can be automatically positioned in the position.
6. The working medium is securely sealed on both sides.
7. When fully open and fully closed, the ball and valve seat sealing surface and the media isolation, so high-speed through the valve medium will not cause the sealing surface erosion.
8. Compact, light weight, it can be considered suitable for low temperature media system, the most reasonable valve structure.
9. Valve body symmetry, especially when the welding body structure, can well withstand the stress from the pipeline.
10. The closing member can withstand the high pressure difference when it is closed.
11. All the valve body valve, can be buried in the ground, so that the valve parts from erosion, the maximum service life of up to 30 years, is the oil, natural gas pipeline the best valve.
Ball valve for the occasion
Many unique characteristics of the ball valve determines the use of the ball valve is relatively wide, usually in the double-position adjustment, sealing performance strict, mud, wear, necking channel, opening and closing action quickly (1/4 turn open), high voltage cut off Pressure difference), low noise, cavitation and gasification phenomenon, to the atmosphere a small amount of leakage, the operating torque is small, small fluid resistance pipeline system, the recommended use of ball valve.
Ball valves are also suitable for light construction, low pressure cut-off (small pressure), corrosive media piping system. Ball valves are also available in low temperature (cryogenic) and piping systems. In the metallurgical industry, the oxygen pipeline system, the need to use a strict degreasing treatment of the ball valve. In the pipeline and gas pipeline in the main line to be buried in the ground, the need to use full diameter welded ball valve. When a regulatory performance is required, a ball valve with a special structure with a V-shaped opening is required. In the oil, petrochemical, chemical, power, urban construction, the working temperature of 200 degrees above the pipeline system can be used metal-sealed metal ball valve.