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。
Both have the same pitch diameter at the top of the hole of internal threads or end of the pipe on external threads, and both have the same thread lengths or depths.
在内螺纹的孔的顶端或者外螺纹的管的端部拥有相同的中径，而且拥有相同的螺纹长度和深度。
Germany RBT import external thread needle valve can be equipped with stainless steel welded pipe, and pipeline butt welding connection, but also through the outer nut removing the valve.
品牌：进口外螺纹针型阀可配带不锈钢焊接管，能与管道直接对焊连接，也可通过外螺母拆卸阀门。
The box taps is a special external tool cutting thread and fishing externally from dropped object such as tubing, drill pipe.
母锥是一种专门从油管、钻杆等管状落物外壁进行造扣打捞的工具。
The invention also relates to a method and a device for manufacturing the external thread of the sealing pipeline and a thread pair pipe fitting of a guide-type interference fit pipe.
本发明还涉及密封管道外螺纹的制造方法、制造装置以及导入式过盈配合管螺纹副管件。
The invention also relates to a method and a device for manufacturing the external thread of the sealing pipeline and a thread pair pipe fitting of a guide-type interference fit pipe.
本发明还涉及密封管道外螺纹的制造方法、制造装置以及导入式过盈配合管螺纹副管件。
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