... 打开泄压阀 Pressure bleed Valve 自动泄压阀 automatic depressur-ization valve 安定泄压阀 safety relief valve ...
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利用水力自动操作，即可以作泄压阀用又可作持压阀用。
The use of automatic hydraulic operation, which can be used for pressure relief valve can also be used as a holding pressure valve.
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当压力恢复到安全值时，泄压阀自动关闭。
When the pressure to a safe value, the pressure relief valve closes automatically.
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