1. Application of flat welding flange
Flat welding steel flange: this is suitable for the carbon steel pipe connecting with nominal pressure not exceeding 2.5 Mpa. The seal surface of flat welding flange can be made into three forms of smooth, concave-convex and mortise form. Qingtian special smooth type flat welding flange is massively used when the medium condition is more moderate, such as low pressure non-purifying compressing air, low pressure circulating water, the advantage of Qingtian special smooth type flat welding flange is that the price is cheaper. Butt welded flange: this is suitable for the butt welding of flange and pipe, butt welded flange has reasonable structure, high strength and high degree of steel, it can withstand high temperatures and high pressures, repeated abusive flexing and temperature fluctuations, and the sealing is very reliable. Nominal pressure is 0.25-2.5 Mpa for welding flange using concave-convex sealing surface. Nylon tie socket welding flange: commonly apply to the pipe of PN ≤ 10.0Mpa, DN ≤ 40; Lap joint flange: this is also known as loose type flange, points welding ring loose type flange, flanging loose type flange and Flange and butt welding loose type flange.
2. Temperature pressure
It is commonly used under the situation when the medium temperature and pressure are not high and the media has a strong corrosiveness. Green water separation happens when the medium is more corrosive, the media part (flanging short section) which the stainless steel flange contact with is high grade resistant to corrosion materials such as stainless steel or others, while the external use low-grade materials such as carbon steel flange ring to clamp it so as to achieve the sealing; Integral flange: It often united the flange and equipment, pipes, valves, etc. together which is commonly used in equipment and valves. Flanges are a kind of disc-shaped parts, they are the most common in pipeline engineering, and flanges are used in pairs. In pipeline engineering, the flange is mainly used for pipe connections. In the pipe that needs to be connected, each install a flange, wire connecting flange can be used in low-pressure pipeline, pressure above 4kg's pipeline should use welded flange. Adding sealing points between two flanges and fasten it with bolts. Different pressure's flange with different thickness should use different bolts. When connecting with pipeline, the parts of the water pump and valve should make into corresponding flange shape, this is also known as flange connection.