管密封 meaning in Chinese

seal of tube
tube packing

Dental root canal sealing materials
牙根管密封材料
Bellows sealed gate valve
波纹管密封的闸板阀
Bellow sealed valve
波纹管密封阀
Bellows seal type
波纹管密封式
Extensive bellows seal qualification testing has been performed in the research and development department to prove the bellows cycle life
在研究发展部进行的扩展波纹管密封合格测试证明波纹管的使用寿命。