当水从板下的一个腔中被抽出来产生负压时，可伸缩的传感器被向下拉，形成一个凹形。
When water is pumped out of a chamber below the plate creating negative pressure, the stretchable sensors are pulled down, producing a concave shape.
当气缸向后运动时，拉动活塞向后，料缸前腔产生负压。
When the cylinder moves backward, the piston is driven to travel backward and generates negative pressure in the front chamber of the cylinder.
单向调压塔是一种用于防止管道系统中产生负压，导致水柱分离再弥合的水锤防护措施。
One-Way Pressure Regulating Tower is effective to protect water hammer which is caused by discontinuous water column invited by vacuum inside the pipeline.
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