The full name of neck flat welding flange is neck flat welding steel pipe flange, which is a commonly used connecting component in industrial pipeline systems.

Structural features: The neck flat welding flange is mainly composed of a flange body with an inner hole in the center and a neck shaped protrusion. The flange body is equipped with multiple screw holes for connecting with bolts. The design of this neck shaped protrusion improves the stiffness and load-bearing capacity of the flange, making the connection between the flange and the pipeline more stable.

Sealing form: The sealing surface forms of the flange with neck flat welding include convex surface (RF), concave surface (FM), convex surface (M), tenon surface (T), groove surface (G), full plane (FF), etc.

Diameter range: Its diameter range is usually DN10~DN600, which can meet the connection requirements of various specifications of pipeline systems.

Pressure rating: Applicable pressure ratings include PN series PN2.5~PN40, Class series Class150~Class1500.

Manufacturing standards: Common manufacturing standards in China include GB/T 9116-2010 "Flat Welded Steel Pipe Flanges with Neck", as well as PN series (European system) and Class series (American system) in HG/T20592~20635-2009.

Material: There are various materials available, including carbon steel, chromium molybdenum steel, 304, 316, 304L, 316L, 321, 347, CF8C, etc. Suitable materials can be selected according to different working conditions.

Advantages and disadvantages: The advantage is that due to the short neck, the strength and load-bearing capacity of the flange are improved, which can be used for pipelines with higher pressure. The disadvantage is that it is more expensive than plate welding flanges and is more prone to collision during transportation due to its shape characteristics.

Installation method: During installation, simply insert the pipeline into the flange hole and adjust it to the appropriate position, then perform single-sided welding, and connect it to another flange through bolts. The installation process is relatively simple.

Application scope: Widely used in pipeline systems in multiple industries such as petroleum, chemical, natural gas, water treatment, pharmaceuticals, and food, suitable for connecting pipelines of various materials, specifications, and pressures.