A single "door" shutter wouldn't be able to open and close this fast.
单一的“门窗”是无法再这样的高速下完成开启——闭合这一整套动作的。
Because of fast close of speed open-shutter, the shocking pressure is produced in supply water pipe, This is the main causes of break of supply water pipe and its sleeve.
在洪水管路中，由于快速开闭器的速关而产生的冲击压，是供水管路和接头破裂的主要原因。
Because of fast close of speed open-shutter, the shocking pressure is produced in supply water pipe, This is the main causes of break of supply water pipe and its sleeve.
在洪水管路中，由于快速开闭器的速关而产生的冲击压，是供水管路和接头破裂的主要原因。
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