ADDRESS: The Front Row of Science and Technology Industry, Yuhuan, Taizhou, Zhejiang, China
Because 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 valve seat sealing ring. The cut-off effect of the ball valve is achieved by the metal ball body under the action of the medium and pressed between the plastic valve seats (floating ball valve). Valve seat seals under a certain contact pressure, the local area occurred elastic deformation. This deformation can compensate for the manufacturing precision and surface roughness of the ball and ensure the sealing performance of the ball valve.
Because ball valve seat ring is usually made of plastic, so in the choice of ball valve structure and performance, to consider the ball valve fire resistance and fire prevention, especially in the petroleum, chemical, metallurgical and other sectors, in the flammable, explosive media The use of ball valves in the equipment and piping system should pay more attention to fire resistance and fire protection.
Normally, double-position adjustment, tight sealing performance, mud, wear, shrink channels, rapid opening/closing action (1/4 turn), high pressure cut-off (large pressure difference), low noise, cavitation and gasification, The ball valve is recommended for piping systems that leak to the atmosphere in small amounts, have low operating torque and have low fluid resistance.
Ball valves are also suitable for use in light piping, low pressure cut-off (small differential pressure), corrosive media systems. Ball valves can also be used in cryogenic (cryogenic) units and piping systems. Oxygen piping systems in the metallurgical industry require the use of strictly degreasing ball valves. When the main line in the oil pipeline and gas pipeline is to be buried underground, full-diameter welded ball valves are required. When required to have adjustment performance, a special structure ball valve with a V-shaped opening is required. In petroleum, petrochemical, chemical, power, and urban construction, metal-to-metal sealed ball valves can be used in piping systems operating at temperatures above 200 degrees.
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