If the valve body material can be welded, but very different thermal expansion coefficient, or changes in operating temperature range of a larger thread junction closure weld must be honey.
如果阀体的材料是可以焊接的，但膨胀系数差异很大，或者工作温度的变化幅度范围较大，螺纹连接部必须进行蜜封焊。
Industrial refrigeration unit is big changes in temperature and pressure range, running speed of the larger situation.
工业制冷机组是在温度、压力变化范围较大、转速较大的情况下运行的。
This article deduces in theory the influence of water flow changes on the temperature heating room and range of the permitted fluctuation of the hydraulic imbalance degree of pipeline.
为此从理论上导出了水流量变化对供暖房间温度的影响以及管路水力失调度允许波动的取值范围。
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