They can produce a "ball valve" effect by intermittently occluding the atrioventricular valve orifice.
他们可以产生“球阀”效应，引起房室瓣口间歇性关闭。
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。
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