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[推荐]球阀适用的场合简介
球阀适用的场合简介:
由于球阀通常用橡胶、尼龙和聚四氟乙烯作为阀座密封圈材料,因此它的使用温度受阀座密封圈材料的限制。球阀的截止作用是靠金属球体在介质的作用下,与塑料阀座之间相互压紧来完成的(浮动球球阀)。阀座密封圈在一定的接触压力作用下,局部地区发生弹塑变形。这一变形可以补偿球体的制造精度和表面粗糙度,保证球阀的密封性能。 
   又由于球阀的阀座密封圈通常采用塑料制成,故在选择球阀的结构和性能上,要考虑球阀的耐火和防火,特别是在石油、化工、冶金等部门,在易燃、易爆介质的设备和管种系统中使用球阀,更应注意耐火和防火。 
   通常,在双位调节、密封性能严格、泥浆、磨损、缩口通道、启闭动作迅速(1/4 转启闭)、高压截止(压差大)、低噪声、有气穴和气化现象、向大气少量渗漏,操作力矩小、流体阻力小的管路系统中,推荐使用球阀。 球阀也适用于轻型结构、低压截止(压差小)、腐蚀性介质的管路系统中。
   在低温(深冷)装置和管路系统中也可选用球阀。
   在冶金行业的氧气管路系统中,需使用到过严格脱脂处理的球阀。
   在输油管线和输气管线中的主管线需埋设在地下时,需使用全通径焊接式球阀。
   在要求具有调节性能时,需选用带V形开口的专用结构的球阀。
   在石油、石油化工、化工、电力、城市建设中,工作温度在 200℃以上的管路系统可选用金属对金属密封的球阀。
译文:
As the ball usually rubber, nylon and Teflon as the seat ring material, so its temperature by the valve seat ring material constraints. Cut-off valve by the metal sphere in the role of media under the action and pressed between plastic seat to complete the (floating ball valve). Valve seat ring in a certain contact pressure, elastic-plastic deformation occurred in some areas. Can compensate for this deformed sphere of manufacturing accuracy and surface roughness to ensure the valve sealing performance. Also, because the valve seat ring is usually made ​​of plastic, so the choice of valve structure and performance, to consider the ball of fire and fire, especially in the petroleum, chemical, metallurgy and other sectors, flammable, explosive devices and media types used in the system control valve, should pay attention to fire and fire prevention. Typically, two-position adjustment, strict sealing, slurry, wear, necking channel, the rapid opening and closing movement (1 / 4 turn open and close), high pressure cut-off (large pressure), low noise, there is the phenomenon of cavitation and gasification, a small amount of leakage to the atmosphere, the operating torque, fluid resistance of the piping system, recommended ball. Ball also applies to the light structure, low-voltage cut-off (pressure difference), corrosive media, the piping system. At low temperature (cryogenic) equipment and piping systems can also be used ball. Oxygen in the metallurgical industry in the piping system, use the handle of the ball skimmed off strict. In the pipeline and gas pipeline in the main line to be buried in the ground, the need to use full-bore welded ball valve. Require adjustment in the performance, the need to use V-shaped opening with a special structure of the ball. In the petroleum, petrochemical, chemical, power, urban construction, the working temperature above 200 ℃ the pipeline system can use metal to metal sealed ball valve.
 
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