How to distinguish and choose the connection thread of the rotary joint
Because the starting standards of Rotary joints are different, the industry standards for selecting joints at the beginning are not consistent. Of course, because of the slow standardization of industry equipment, many uncommon rotary joint thread styles were cleaned. There are still several kinds of threads that are relatively common now. How do we choose? The rotary joint editor is here to help you.
Threaded connection, flange connection, welding.
Rotary joint
Today I will talk about the thread of the threaded connection. How many kinds of threads are there? What kind of threads are they? Everyone knows that threads can be divided into two categories: metric thread and inch thread.
Metric threads are known to be domestic threads, and domestic metric threads are divided into coarse thread and fine thread. Coarse thread is divided into triangular thread, trapezoidal thread and square thread. The metric threads used on rotary joints are mostly triangular threads with a tooth profile angle of 60 °.
Inch threads are also divided into: British threads and American threads. The inch thread is divided into: taper pipe thread, pipe thread. The profile angles of inch threads are 60 ° and 55 °. Most of the inch threads used in rotary joints are inch 55 ° threads, and rarely used 60 °. Generally used by customers. Imperial taper threads also have 55 ° sealed and unsealed threads. Rotary joints use sealed inch taper threads. The profile angle for American threads is 60. It is generally used only when imported equipment and customer requirements, depending on which country the equipment the customer enters.