Pipe thread: Mainly used to connect pipelines to make the internal and external threads fit tightly. There are two types of straight pipes and tapered pipes.

The British standard thread comes from the Wyeth thread. The British standard seal pipe thread is a general purpose sealed pipe thread. It is necessary to add a sealing filler to the thread pair during use. Its characteristics are that it is more economical and requires moderate processing accuracy. No sealing filler is required. It can ensure that the thread of the sealing connection is a dry sealing pipe thread. There is no dry sealing pipe thread in the inch pipe thread system.

Sealed pipe threads have two major functions: mechanical connection and sealing; non-sealed pipe threads have only one function of mechanical connection. Therefore, the accuracy of sealed pipe threads is stricter than that of unsealed pipe threads. Some people see unsealed pipe threads. The tolerance of the pitch diameter is half of the tolerance of the sealed pipe thread. It is considered that the accuracy of the unsealed pipe thread is higher than that of the sealed pipe thread. This view is incorrect. The sealed pipe thread has requirements for the accuracy of the tooth shape. Its large diameter, The tolerances of the pitch diameter and the minor diameter are the same; the flank angle and pitch error have a greater impact on the sealing performance. The non-sealed pipe thread basically has no requirement for the accuracy of the tooth form. The tolerance of the top diameter is greater than the tolerance of the pitch diameter; the bottom diameter There is no tolerance requirement. In addition, some people think that it is possible to use non-sealed cylindrical internal threads and sealed cylindrical external threads to form a fit. This view is also wrong. This is equivalent to relaxing the accuracy requirements of sealed internal threads, because of the tightness of sealed pipe threads. The use of occasions, processing accuracy, assembly and testing technologies are different, the current pipe thread standards cannot guarantee that all threaded parts that meet the standards can be sealed. In the imperial sealed pipe thread standards, it is impossible to propose a unified thread single parameter accuracy Requirements. These individual thread parameters have a direct impact on the sealing performance. At present, the fundamental way to solve the problem is to target its own specific products, and each industry or company formulates its own internal control measures. The internal control indicators of these parameters are generally confidential to the outside world. Companies in the industry are also not universal, and manufacturers must have a clear understanding of this. The standard for sealing pipe threads is not a panacea, and the manufacturer may need to pay attention to sealing problems.

Cangzhou Minchuang pipe fitting Co., Ltd. has professional technology, advanced equipment, and can process standard threads to meet the various needs of buyers.