National standard flanges are not only flanges produced in accordance with the dimensions and tolerance ranges required by national standards, but also different from flanges (two standard flanges) or non-standard flanges (customized drawings) that are not produced according to standard sizes. Flange connection is to fix two pipes, pipe fittings or equipment on a flange plate respectively, add flange pads between the two flange plates, and fasten them together with bolts to complete the connection. Some pipe fittings and equipment have their own flange, which is also a flange connection. Flange connection is an important connection method for pipeline construction. The flange connection is easy to use and can withstand greater pressure. In industrial pipelines, flange connections are widely used.

According to the connection method, the type of flange connection can be divided into: plate flat welding flange, flat welding flange with neck, butt welding flange with neck, socket welding flange, threaded flange, flange cover, butt welding ring with neck Loose flanges, flat welded ring loose flanges, ring groove face flanges and flange covers, large diameter flat flanges, large diameter high neck flanges, eight-shaped blind plates, butt weld ring loose flanges, etc.

　In order for users to better understand flange knowledge and facilitate communication between us, the additional flange standard connection is as follows: 　　　

National standard GB/T9119-2010 flange standard

https://wenku.baidu.com/view/b3b3bb15ddccda38366baf03.htm

Chemical HG/T20592-2009 flange standard

https://wenku.baidu.com/view/c3840b73b307e87101f696d9.html

Click to open the link to view the flange specifications. I hope to help you. Cangzhou Huangchi Pipeline Equipment Co., Ltd. wishes you a smooth job and a prosperous business.