morphological open-close operation 形态学开
Open Operation and Close Operation 开运算和闭运算
close-open operation 闭开算子
Stub acme thread on stem provides rapid open-close operation.
阀杆上的短梯形螺纹适用于快速启闭操作。
Quick Open-Close Operation, Fixable Operation, Simple and Easy.
启闭迅速，操作灵活，轻便省力。
The valve is used with worm gear driving and electric device to form a complete set to realize open-close operation. It is the ideal equipment of adjusting flow.
配用电动装置及蜗轮传动装置，可实现启闭操作，是调节流量的理想设备。
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