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。
The valve body expansion pipe is only used to open or close the valve, but can not replace the expansion pipe in the pipe.
阀体伸缩器只作用于方便阀门本身的启闭，不能代替管道中应设有的伸缩器。
The valve body expansion pipe is only used to open or close the valve, but can not replace the expansion pipe in the pipe.
阀体伸缩器只作用于方便阀门本身的启闭，不能代替管道中应设有的伸缩器。
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