Reducing Flange

Connection Methods 

Reducing flanges are usually connected by flange nuts and bolts.

Production Process 

Professional integral forging, forging manufacturing, middle plate cutting, middle plate rolling, etc

Processing Methods 

High-precision CNC lathe turning, ordinary lathe fine turning, argon arc welding, etc.

Nominal pressure of reducing flanges sch5s, sch10s, sch20s, sch30s, sch40s, etc.

Manufacturing Standards 

National standards, American standards, Russian standards, Japanese standards, etc.

Purpose Of Reducing Flange

Reducing flange are widely used in water conservancy, electricity, power stations, pipeline accessories, industry, pressure vessels, etc.

Reducing weld neck flanges are also called large and small flanges. Except for the pipe diameter, the flange size is the standard flat welding flange size of the larger diameter of the two diameters, but the pipe diameter is smaller than the normal diameter of the flange.

This type of flange is generally not recommended for use. It is only used when the diameter of the equipment, pump nozzle is larger than the pipe to be connected, and the installation size does not allow the installation of a reducer or it is unreasonable to install several reducers. At present, reducing flanges are limited to PN ≤ 2.5MPa and only the former Ministry of Petroleum has this standard.

Application Of Reducing Flange

Reducing weld neck flanges are also called sealing and fastening connectors. Reducing flange are disc-shaped parts, which are most common in pipeline engineering, and flanges are also used in pairs.In the field of pipeline engineering, flanges play a crucial role in ensuring secure and efficient pipeline connections.

In the pipelines that need to be connected, flanges are installed in various ways. It can be used for low-pressure pipelines, and welding flanges are used when the pressure is above 4kg.

Add sealing points between the two flanges and then tighten them with bolts. Flanges with different pressures of course have different thicknesses, and the bolts used are also different. These equipment components are designed with matching flange shapes, commonly referred to as flange connections. It is widely used in large containers in the fields of aerospace, petroleum, and chemical industry.

Advantages Of Reducing Flange

Reducing flange has multiple advantages: standard Reducing flange not only saves space and reduces weight, but more importantly, it ensures that no leakage occurs at the joint. The compact flange’s reduced size reduces the seal’s diameter, reducing the cross-section of the sealing surface.
Secondly, a sealing ring has replaced the flange gasket to match the sealing face to the sealing face. In this way, only a small amount of pressure is required to compress the cover tightly. With the reduction in the required pressure, the required bolt size and number can be reduced accordingly.

Processing Process Of Reducing Flange

Since the nominal diameter of the container cylinder of the reducing flange and the specific size indicated by the nominal diameter of the pipe are different, the sizes of the container flange and the pipe flange of the same nominal diameter are also different, and the two cannot be used interchangeably.

Usually, the reducing flange is divided into several arc segments for processing. First, the blank is forged into a square billet and then cold-formed into an arc. After annealing and stress-relieving heat treatment, it is assembled into a complete circle and processed on a vertical lathe to the designed shape and size. Finally, it is transported to the construction site, combining several arcs. Welded into a completely reduced flange, it is assembled with the pressure vessel.

 Reducing flange has different production standards for use and production. According to the corresponding standards, the actual use value and role of  Reducing flange can be guaranteed.

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