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双座调节阀为什么不能小开度使用,这是由它的阀座结构所决定的。双调节阀有两个阀芯,上阀芯处于流开,下阀芯处于流闭,调节阀的阀芯处于流开时,稳定性比较好
电动球阀分类比较广,有不同控制的调节型和开关型执行器之分,电动调节球阀和电动开关球阀。电动球阀适用于管道压差大,密封要求严格的开关和切断管道介质的工艺场合和流体控制系统。