Flange is also called flange or flange. A flange is a part that connects a pipe to a pipe, and is connected to a pipe end. There are holes in the flange, and bolts make the two flanges tight. The flanges are sealed with a gasket.
Five basic types: flat welded flange, butt welded flange, threaded flange, socket welded flange, loose flange. There are several types of flange sealing surfaces. Generally, there are convex (RF), concave (FM), concave-convex (MFM), tongue-in-groove (TG), full-plane (FF), and ring-joint (RJ) surfaces.
Flat-welded steel flanges: suitable for carbon steel pipe connections with a nominal pressure of no more than 2.5 MPa. The sealing surface of the flat welded flange can be made into three types: smooth, concave and convex, and tongue and groove. Smooth type flat welded flange has the largest amount of application. It is mostly used in the case of medium conditions, such as low-pressure non-purified compressed air and low-pressure circulating water. Its advantage is that the price is relatively cheap.
Butt welded steel flange: For flange and pipe welding of the counterpart, its reasonable structure, strength and rigidity, can withstand high temperature and high pressure and repeated bending and temperature fluctuations, reliable sealing, nominal pressure of 0.25 ~ 2.5MPa The welding flange adopts convex and concave sealing surfaces.
Socket welding flange: It is often used in pipes with PN≤10.0MPa and DN≤40.
Loose flange: Loose flange is commonly known as loose flange, sub-welding ring, flange, flanged flange and butt welding flange. Commonly used for medium temperature and pressure are not high and corrosive medium Stronger situation. When the corrosive medium is strong, the part of the flange that touches the medium (flanged joint) is a corrosion-resistant high-grade material such as stainless steel, while the outside uses a flange ring of a low-grade material such as carbon steel to clamp it. To achieve the seal.
Integral Flange: Often the flange is integrated with equipment, tubes, fittings, valves, etc. This type is commonly used on equipment and valves.
