Gate valves
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Gate is one of the most common open/close, use of ram (namely the open-close part, in the gate opening and closing a called ram or gate, gate called ram block) to connect (full open) or truncation (seated) line in the medium. It does not allow for river closure, use should be avoided in the open gate trace, because of the erosion of high-speed flow of medium will accelerate the damage of the sealing surface. Double DE gate at the channel center line perpendicular to the gate of the one-sided as lifting movement, like gate cutting medium pipeline, so as the gate valve.
闸阀是一种最常见的启闭阀，利用闸板（即启闭件，在闸板中启闭件称为闸板或闸门，闸座称为闸板座）来接通（全开）或截断（全关）管路中的介质。它不允许作为截流用，使用中应避免将闸板微量开启，因高速流动的介质的冲蚀会加速密封面的损坏。双德闸板在垂直于闸门座通道中心线的片面作为升降运动，象闸门一样截断管路中的介质，故称做闸阀。
闸阀是指关闭件（闸板）沿通路中心线的垂直方向移动的阀门。闸阀在管路中主要作切断用。是使用很广的一种阀门，一般口径DN≥50mm的切断装置都选用它，有时口径很小的切断装置也选用闸阀。闸阀作为一种级别较低的阀门，比较常见。
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