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。

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The different closure division may produce different temperature strain and initial strain at the same time, and effect closure deviation thereby.

同时采用不同的合拢分段会产生不同温度应力以及初始应力，从而影响合拢偏差。

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When installed cooling to a safe temperature, contact automatic closure and a return to normal working condition.

当装置冷却到安全工作温度时，触点自动闭合，恢复正常工作状态。

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