... ram schooner ==> 无顶帆三桅纵帆船 ram seal ==> 陶瓷金属撞入封接 ram shaft ==> 动力油缸活塞杆 ...
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Most of the valve is sealed using force, that the valve is closed, forced to rely on external ram pressure to the valve seat to ensure the sealing surface of the seal.
大部分闸阀是采用强制密封的，即阀门关闭时，要依靠外力强行将闸板压向阀座，以保证密封面的密封性。
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