高压闸阀
,属于强制密封式阀门
,所以在阀门关闭时,必须向闸板施加压力,以强制密封面不泄漏。当介质由闸板下方进入阀六时,操作力所需要克服
的阻力,是阀杆和填料的磨擦力与由介质的压力所产生的推力,关阀门的力比开阀门的力大,所以阀杆的直径要大,否则会发生阀杆顶弯的故障。
高压闸阀开启时,闸板的开启高度,为公称直径的25%~30%时,流量已达到最大,表示阀门已达全开位置。所以闸阀的全开位置,应由闸板的行程来决定。
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