Rapid closing of the valve is accomplished fitting a heavy spring.
安装一根粗弹簧就可以达到迅速关闭阀门的目的。
Objective To analyse the closing mechanism of ideal aortic valve model.
目的分析理想状态下主动脉瓣关闭机制。
Ball valve for opening and closing the main pipe and equipment used media.
球阀主要供开启和关闭管道和设备介质之用。
Ball valve for opening and closing the main pipe and equipment used media.
球阀主要供开启和关闭管道和设备介质之用。
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