expansion valve body

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。