减压阀的备用阀门被打开，减少压力。
7小时30分钟尽管操作员已将水抽入主回路，但温度仍然很高。减压阀的备用阀门被打开，减少压力。
7 hr 30 min Even after operators pump water into the primary loop, pressure is still high. The PORV 'backup valve is opened to lower the pressure.
使用的气瓶和备用气瓶之间有一个半自动调节阀来控制。
Each gas manifold shall be constructed to provide semi-automatic switch over from in-use cylinders to online backup cylinders.
微电脑自动控制电动排渣阀，根据杂质含量可任意设置过滤周期和排渣时间，全自动操作，同时还设置了备用的手动切换功能。
The filtration cycle and slag discharge time of dumping dregs valve is controlled by microcomputer automatically according to impurity content, and it has reserve manual switching function.
备用密封件是阀帽(12)内主阀杆密封组件(20)的二级密封。
The backup seal is secondary to the main stem seal assembly (20) in the bonnet (12).
备用密封件是阀帽(12)内主阀杆密封组件(20)的二级密封。
The backup seal is secondary to the main stem seal assembly (20) in the bonnet (12).
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