启闭件 meaning in English

disc

Disc , the trim part of butterfly valves , rotates with the stem to open / close and modulate the valve
蝶阀是随阀杆一起转动的蝶板作启闭件，用以实现阀门的开启，关闭与调节。
Ball valve uses ball with circular hole as open - close part , through turning ball with stem to realize on - off movement . ball valve is mainly applied to stop , distrubute and change flowing direction of medium
球阀是用带圆形的通孔的球体作启闭件，球体随阀杆转动，以实现启闭动作的阀门，球阀在管道中主要用于切断，分配和改变介质流动方向。
Globe valve indicates that the stem drive disc along the central spindle of seat make lifting movement , it is a sort of common stop valve . which is mainly used to connect and disconnect medium in pipelines . generally , it is not used to adjust flow
截至阀是指启闭件（阀瓣）有阀杆带动并沿阀座中心轴线做升降运动的阀门，是一种常用的截断阀，主要用在接通或截断管路中的介质，一般不用于调节流量。