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.
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。
Generally ball valve's structure divides into the fluctuation ball ball valve and the fixed ball ball valve two kinds.
一般球阀的结构分为浮动球球阀和固定球球阀两类。
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