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Ball Valve Use Is Rising Every Year

Ningbo Fenfa Valve Co.,Ltd | Updated: Oct 13, 2017

Ball valve came out in the 1950s, 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. In the western industrialized countries, the use of ball valves is increasing year by year.

Ball valve in the pipeline is mainly used to cut, allocate and change the direction of the flow of the medium, it only needs to rotate 90 degrees of operation and very small torque can be closed tight. The ball valve is most suitable for switch, cut-off valve use.

Since the ball valve is usually made of rubber, nylon and Teflon as the seat sealing material, its use temperature is limited by the material of the seat sealing ring. Ball valve cut-off effect is a metal sphere in the role of the media, in the plastic seat between the pressure to complete (floating ball valve). The valve seat seal ring under the certain contact pressure action, the local area has the elasto-plastic deformation. This deformation can compensate the manufacture precision and surface roughness of the sphere, and ensure the sealing performance of the ball valve.

Because the valve seat seals of the ball valve are usually made of plastic, therefore, in the selection of the structure and performance of ball valve, to consider the ball valve fire and fire, especially in the petroleum, chemical, metallurgical and other sectors, in flammable, explosive media equipment and piping system using ball valve, but also pay attention to fire and fire.

Ball valve is divided into: floating ball valve, fixed ball valve, track ball valve, V-type ball valve, tee ball valve, stainless steel ball valve, floating ball valve, steel ball valve, forged steel ball valve, ash ball valve, sulfur-resistant ball valve, card set ball valve, welding ball valve. In addition, by function and transmission form can also be categorized as follows:

1. Minimum flow resistance (actually 0). 2. In the absence of lubricant work will not be stuck, it can be reliably applied with corrosive medium and low boiling point liquid. 3. In the more earth pressure and temperature range, can achieve hundred percent seal. 4. Can achieve super fast opening and closing, some of the structure of the open and close time is only 0.05~0.1s to ensure that the test rig automation system. Quick and close valve, operation without impact. 5. The ball-type shutoff can be positioned automatically in position. 6. The working medium is sealed reliably on both sides. 7. In open and full closed, the ball and seat sealing surface and media isolation, so high-speed through the valve medium will not cause the sealing surface erosion. 8. Compact structure, light weight, it can be considered suitable for low-temperature medium system of the most reasonable valve structure. 9. Valve body symmetry, especially when welded valve body structure, can well withstand the stress from the pipeline. 10. Closed parts can withstand the high pressure difference when closing. 11. Full-welded valve body ball valve, can be buried directly in the ground, so that the valve internal parts are not eroded, the maximum service life of up to 30 years, oil, gas pipelines are the ideal valve.

Applicable occasion of ball valve

Many unique features of the ball valve determine the use of the ball valve is relatively wide, usually, in the dual-position adjustment, strict sealing performance, mud, wear, necking channels, open and close movements (1/4-turn), high pressure cut-off (large pressure difference), low noise, cavitation and gasification phenomenon, to the atmosphere a small amount of leakage, operating torque, The ball valve is recommended in a piping system with small fluid resistance.

Ball valve is also suitable for light structure, low pressure cut-off (small voltage difference), corrosive media piping system. Ball valves are also available in low temperature (cryogenic) devices and piping systems. In the metallurgical industry oxygen piping System, the use of strict degreasing treatment of the ball valve. The full diameter welded ball valve should be used when the line of charge in the pipelines and pipelines is buried underground. The ball valve with V-shaped openings should be selected when the performance is required. In the petroleum, petrochemical, chemical, electric power, urban construction, the operating temperature of 200 degrees above the pipeline system can be selected metal metal sealing ball valve.

Ningbo Fenfa Valve Co.,Ltd