WN flange factory flange sealing surface: the part of a pair of flanges in contact with the gasket.

　　WN flange factory flange sealing surface form and code

　　1. WN flange raised surface (RF): the surface is a smooth plane, and the dense waterline can also be machined. The sealing surface has a simple structure, is convenient to process, and is convenient for anti-corrosion lining. However, the contact area of ​​the gasket on the sealing surface is large, and the gasket is easy to be squeezed to both sides during pre-tightening, and it is not easy to be compressed.

　　2. WN flange concave-convex surface (MFM): The sealing surface is composed of a convex surface and a concave surface. Placing a gasket on the concave surface can prevent the gasket from being squeezed out, so it can be applied to occasions with high pressure.

　　3. WN flange tongue and groove surface (TG): The sealing surface is composed of tongue and groove, and the gasket is placed in the groove and will not be squeezed. The shims can be narrower, so the bolt force required to compress the shims is correspondingly smaller.

　　4. WN flange full plane (FF): full plane sealing is suitable for occasions with low pressure (PN≤1.6MPa);

　　5. WN flange ring connection surface (RJ): The ring connection surface is mainly used on necked butt welding flanges and integral flanges, and the applicable pressure range is (6.3MPa≤PN≤25.0MPa).