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您现在的位置:水果拉霸多人版 >> 技术文章 >> 介质流向的做法及截止阀的功能
介质流向的做法及截止阀的功能
浏览次数:1122发布日期:2013-11-20

一般截止阀的流通介质由阀座下方往上流动,即习惯上称为“低进高出”,这样当阀门关闭时,阀杆处的密封填料不致遭受工作介质压力和温度的作用, 并且阀门关闭严密的情况下,还可进行填料的更换工作。其缺点是阀门的关闭力较大,较大口径的阀门很难实现密封。因此,有时也使介质由阀座上方往下流动,即习惯上称为“高进低出”,由于介质压力作用于阀瓣的上方,阀门很容易实现密封,但这样阀门的开启力矩较大,容易造成密封填料的泄漏并且不能在线更换阀门的填料。

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(2)角式截止阀

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另一种作为换向阀较常用的工况是压力释放系统。两个安全阀装在一个三通截止阀上,当其中一个安全阀需要隔离或者维修时,另外一个安全阀可以正常运行。由于内部结构的原因,三通截止阀流阻很大。流体方向的改变会使流体在大口径三通截止阀上 产生较大的反作用力。

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