According to connection method classification (1) threaded connection valves: valve with internal thread or external thread, and pipe thread connection.
按连接方法分类(1)螺纹连接阀门：阀体带有内螺纹或外螺纹，与管道螺纹连接。
In order to facilitate the installation and removal of threaded connection valves, piping system at the appropriate location can be used on pipe joints.
为了便于安装和拆卸螺纹连接的阀门，在管路系统的适当位置上可用管接头。
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