Flange connections involve securing two pipes, fittings, or equipment to separate flange discs first, then inserting a flange gasket between the two discs and fastening them together with bolts to complete the connection. Some fittings and equipment come with a flange disc already attached, which also falls under flange connections. Flange connections are an essential method of pipe construction.
Joints can be categorized by connection type as: Flat Welding Flange, Socket Weld Flange, Blind Flange, Threaded Flange, Flange Cover, and Ring Type Joint Flange with Neck and Socket Weld.
Socket flange, slip-on flange with flat welding ring, raised face flange and flange cover, large diameter flat flange, large diameter high neck flange, blind flange with bevel, welding ring slip-on flange, etc.


Flat焊接flanges are suitable for steel pipe connections with a nominal pressure not exceeding 2.5 MPa. The sealing surfaces of flat welding flanges can be made in three types: smooth, concavo-convex, and tenon-slot. Smooth flat welding flanges are used for...
Volume. Typically used in milder medium conditions, such as low-pressure non-purified compressed air, low-pressure recirculating water.
The neck height of the socket welding flange is lower, which improves the rigidity and load-bearing capacity of the flange. Compared to the blind flange, it requires more welding work and higher consumption of welding rods.High-pressure andBend repeatedly and withstand temperature fluctuations, but easy for on-site installation, allowing for the omission of the process of welding seam knock damage, and is well-received.


A flat welding ring loose flange is a movable flange plate, commonly used with plumbing and drainage accessories (most often with expansion joints). When the manufacturer ships the product, each end of the expansion joint comes with a flange, which is directly connected to the pipes and equipment in the project using bolts. The general purpose of using a flat welding ring loose flange is to save materials. Its structure is divided into two parts: the pipe section connects to the pipe at one end and is flanged at the other, while the flange section is fitted over the flange. The flange is made of low-grade material, and the pipe section is made of the same material as the pipe, achieving the goal of material savings.

Loose-bolt flange with welding ring, loose-bolt socketed neck flange, welding ring loose-bolt plate flange, flat welding ring loose-bolt plate flange, plate flange loose-bolt flipped, and additional flanges with bored rods for securing after installation to prevent loosening due to vibration. Some flange bolts are smooth without threads and need to be slender, known as slender rod flange bolts. These bolts are beneficial for connections subjected to variable forces. High-strength bolts are used on steel structures, with larger heads and varying sizes. Hot-dip galvanized round steel produces an alloy layer through reaction between molten metal and the iron substrate.