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.

In general, in the double-position adjustment, strict sealing performance, mud, wear, necking channel, opening and closing action quickly (1/4 turn off), high voltage cut off (large pressure), low noise, cavitation and gasification, It is recommended to use ball valves in small piping systems where the atmosphere is small and the operating torque is small and the fluid resistance is small.

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 rigorous 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