Both high-pressure and low-pressure large diameters use welded neck flanges

The neck flange is divided into a threaded connection (wire connection) neck flange and welded neck flange. The small diameter of the low-pressure has a wire neck flange, and the high-pressure and low-pressure large diameters use the welded neck flange. The thickness of the neck flange with the same pressure and the diameter and number of connecting bolts (composition: head and screw) are different.

According to the different levels of pressure, flange gaskets with necks also have different materials, ranging from low-pressure asbestos gaskets, and high-pressure asbestos gaskets to metal gaskets. The neck flange connection or flange joint refers back to the detachable connection of the flange, Gasket and bolt as a group of the combined sealing structure.

Pipe flange refers back to the flange used for piping in the pipeline installation, And used on the equipment refers to the inlet and outlet flange of the equipment. There are holes in the flange, and the bolts tightly connect the two flanges. Neck flanges are relatively difficult to process among all flanges. Common forged welded flanges are not only costly but also prone to cracks on the flange neck and welded joints.
Water pumps and valves (functions: cut-off, diversion, pressure stabilization, diversion, etc.). When connecting with pipelines, parts of this equipment are also made into corresponding flange shapes, also known as flange connections.

Any connecting parts that are connected and closed at the same time by bolts (composition: head and screw) on the two planes at the periphery, such as the connection between the flange and the water pump, it is not easy to call the water pump ‘flange parts’.
Smaller ones such as valves (function: cut-off, diversion, voltage stabilization, shunting, etc.), can be called ‘flange parts’. The flat welding flange has a beautiful appearance and a smooth surface. It is mainly used for the connection of carbon steel pipes, and its nominal pressure does not exceed 2.5MPa. The forging process of splitting the blank or cutting off the head.