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。
2
Germany RBT import externalthread needle valve can be equipped with stainless steel welded pipe, and pipeline butt welding connection, but also through the outer nut removing the valve.