Flange connections involve securing two pipes, fittings, or equipment to separate flange plates first, then inserting a flange gasket between them and fastening them together with bolts to complete the connection. Some fittings and equipment come with flange plates already attached, which also fall under flange connections. Flange connections are an essential method for pipeline construction.
The types of flange connections, categorized by connection methods, include: flat welding flanges, socket welding flanges, blind flanges, threaded flanges, and ring-type flanges for socket welding.
Socket flange, slip-on flange with flat welding ring, ring groove flange and flange cover, large diameter flat flange, large diameter high neck flange, bevel blind flange, welding neck slip-on flange, etc.


Flat welding flanges are suitable for steel pipe connections with nominal pressure not exceeding 2.5 MPa. The sealing surfaces of flat welding flanges can be made in three types: smooth, concave-convex, and tenon-slot. Smooth flat welding flanges are suitable for...
Usage. Commonly used under mild medium conditions, such as low-pressure non-purified compressed air, low-pressure recirculating water.
The neck height of the socket weld flange is lower, which improves the rigidity and load-bearing capacity of the flange. Compared to the welding neck flange, it requires more welding work and consumes more welding rods.High-pressure &The product can withstand bending and temperature fluctuations, yet it is convenient for on-site installation, allowing for the omission of the welding seam patting process, and is thus well-received.


Flat焊接Ring Loose-Fitting Flange is a movable flange plate, commonly used with plumbing and drainage accessories (most frequently on expansion joints). At the factory, each end of the expansion joint has a flange, which is directly connected to the pipeline and equipment in the project with bolts. The general purpose of using the Flat焊接Ring Loose-Fitting Flange is to save material. Its structure is divided into two parts: the pipe section connects to the pipeline with one end and has a flange on the other, and the flange plate is fitted over the flange. The flange is made of lower-grade material, while the pipe section is made of the same material as the pipeline, achieving the goal of material savings.

Loose-bolt flange with socket welding ring, socket welding loose flange, flat welding ring loose flange, loose flange with turned-over flat, and for the need of locking after installation, there are bolts with holes for vibration resistance. Some flange bolts have a smooth shank without threads and need to be made thin, known as slender shank flange bolts. These bolts are beneficial for connections subjected to variable forces. High-strength bolts with special heads are used in steel structures, with varying sizes and dimensions. Hot-dip galvanized round steel is produced by causing the molten metal to react with the iron substrate to form an alloy layer.