Play great positioning pin ensures disc not because butterfly plate gravity drop, also can be installed in the valve stem end adjustment block to ensure that the butterfly plate fixed position.
弹赞定位销可保证蝶板不会因为蝶板重力作用下坠，还可在下阀杆端部设置调整块来保证蝶板位置固定。
2
There was nothing to fall back on so valvular surgery without an artificial valve - at least as a backup - was a very dangerous game to play.
所以，没有人造瓣膜的瓣膜手术是一个非常危险的游戏。
3
Moreover pipeline jamming, also will present the regulating valve not to play the control action the phenomenon.