Big and small head, also known as reducing pipe, is one of the chemical pipe fittings, mainly used to connect two different pipe diameters. There are two types of heads: concentric heads and eccentric heads. Concentric head refers to the heads whose centers are on the same straight line, while eccentric head refers to the heads whose centers are not on the same straight line. ‌12

Materials and standards

The materials of the heads include carbon steel, stainless steel, and alloy steel. Its quality should comply with current national standards such as GB/T 12459-2005 for seamless welded steel fittings. In addition, the size of the head can also be produced according to different standards, such as national standards, American standards, British standards, etc.

Application scenarios

Da Xiao Tou is widely used in industries such as oil and gas pipeline engineering, chemical plants, power plants, shipyards, pharmaceuticals, dairy products, beer, and beverages. Its functions include changing the flow rate, installing pipelines on walls or floors to save space, etc.

manufacturing process

The manufacturing process of small and large heads includes reduced diameter pressing, expanded diameter pressing, or reduced diameter plus expanded diameter pressing. For certain specifications of reducers, stamping forming can also be used.