手动操作阀门的介绍

手动阀门是通过手轮、手柄来操作阀门的,在石化装置中应用十分普遍,操作人员要注意以下几点:
1、阀门的开启方向,通常是逆时针表示阀门打开,顺时针表示阀门关闭。因此,开关阀门时要注意方向。
2、阀门的手柄,手轮大小是根据阀门人力开关设计的。因此,只要手工转动阀门即可实现开关,一般不允许借助杠杆或扳手来开关阀门。为了防止用力过猛,损坏密封面及其他零件。
3、当关闭式开启闸阀及截止阀至死点时,要回转 1/4 圈至 1/2 圈,使螺纹更好密合,以免拧得过紧,损坏阀件。
4、不能把闸阀、截止阀做节流用,这样容易冲刷阀板及密封面,且引进振动泄漏,损坏阀门
5、开启蒸汽阀门时,应缓慢开启,排除管道中的凝结水,防止产生水击现象。损坏阀门及管道。
6、大口径的闸阀、截止阀和蝶阀,有的设有旁通阀,其作用是平衡阀门两侧压力,减少开启力。因此开启时,应先打开旁通阀,再慢慢开启阀门,关阀时,应先关闭旁通阀,再慢慢关闭主阀门。
7、某些阀门关闭后,待温度下降后,阀件收缩,密封面出现细微泄漏现象,此时,应待阀门关闭后,再适当紧一次阀门即可。
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