介绍了固定球球阀的密封原理和阀座密封力的计算，分析了加工误差对密封性能的影响，提出了改进意见。
Introducing the sealing principle of fixed ball valve and the calculation of seat sealing force, analyzing the effect of machining error upon sealing property and putting forward improving opinions.
分析了管程温差对标准管箱法兰密封性能的影响，并为标准管箱法兰的选用提供了理论依据。
The influence of standard channel flange sealed performance is analyzed in the case of subjected to channel side temperature difference.
基于流体动力学理论，推导了水电解槽密封泄漏率公式，并分析了其密封性能。
The sealing leakage ratio formula of water electric tank was deduced based on hydrodynamic theory and the sealing performance was analyzed.
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