A water heater's temperature and pressure relief valve must be piped to the nearest drain in order to avoid damage in the event the valve is actuated. 热水器的降温减压安全阀必须用管道连接到最近的排水口，以避免万一阀门启动所造成的破坏。
Check the temperature-pressure relief valve to insure that the valve has not become incrusted with lime. 检查降温减压安全阀是否被石灰堵塞。
Experimental results show that the optic-electric measurement system can meet the requirement of measuring voltage distribution of valve thyristors. 实验表明本文研制的光电测量系统可以满足测量换流阀晶闸管电压分布的需要。
In this paper, the influence of the aforementioned charge dispersity at valve turn-off on thyristor terminal voltages is illustrated. 首先分析直流换流阀关断时刻反向恢复电荷差异对晶闸管级端电压的影响。
