Ball for the occasion details

Since valve usually rubber, nylon and PTFE as the seat ring material, so its temperature by the seat ring material constraints. The closing valve action is by a metal sphere of the medium under the action of compression between the valve seat and the plastic to be completed (floating ball valve). A valve seat ring in the contact pressure, the elastic-plastic deformation occurred in some areas. This distortion can be compensated sphere manufacturing precision and surface roughness, ensure that the valve sealing performance.
Typically, two-position adjustment, strict sealing, slurry, wear, necking channels, headstock moves quickly (1/4 turn open and close), high pressure cut-off (large pressure), low noise, cavitation and gasification phenomena, a small amount of leakage to the atmosphere, the operating torque is small, fluid resistance of the piping system, the valve is recommended.
Also, because the ball valve seat ring is usually made ​​of plastic, so the selection valve structure and performance, it is necessary to consider the fire and fire ball, especially in the petroleum, chemical, metallurgy and other sectors, flammable, explosive media equipment and pipe kind used in the system valve, should pay attention to fire and fire.
Ball also applies to lightweight construction, low voltage cut-off (pressure difference), corrosive media, the piping system.
At low temperature (cryogenic) equipment and piping systems can also be used ball.
In the metallurgical industry, oxygen piping system, the need to use a rigorous degreased valve.
Pipelines and gas pipelines in the main line to be buried in the ground, the need to use the full bore welded ball valve.
Require adjustment in performance, should be chosen with a V-shaped opening special structure of the ball.
In the petroleum, petrochemical, chemical, power, urban construction, operating temperature above 200 ℃ piping system can be used metal to metal sealing ball valves.