hydraulic seal meaning in Chinese

防水层
水闸门
液体密封
液压密封

The test tube is closed at one end with a hydraulic seal .
试管的一端为水封所封闭。
Researching to hydraulic seal device
液压密封装置的探索
Specification for dimensions of housings for hydraulic seals for reciprocating applications
往复运动的液压密封件壳体尺寸规范
Here a fixed entripetal pump 5 conveys it to the outlet pipe 6 a hydraulic sealing device 5 prevent product oxidation due to ambient air
（ 4 ）经过清净的物料从碟片区流入到转筒的上腔，在这里有个固定的离心泵（ 5 ）将它们传到出料管线（ 6 ）一个水压密封装置阻止了周围空气对物料的氧化。
Based on the previous work , the main results are as follows : 1 . the sealing mechanism can be classified as capillary sealing and concentration sealing after systematical analyzing the sealing mechanism of the sealing formation . in fact , both the pressure sealing and the hydraulic sealing are belong to capillary sealing , they are special forms of capillary sealing ; 2
划分出封盖层的类型和规模，取得的重要成果和创新之处主要体现在： 1 、系统分析了油气封闭机理，指出了油气盖层封闭油气主要为毛细管封闭和浓度封闭，水动力封闭和压力封闭是毛细管封闭的特殊表现形式，本质上其机理仍属于毛细封闭。