Flange sealing surface type
Flange sealing cover is basically:
Full-plane FF protruding surface RF concave surface FM convex surface M tenon surface T groove surface G ring connection surface RTJ(RJ) five types, according to the working conditions, media, pressure, specifications, temperature and other conditions, so the type of choice is not the same.
1.FF- full flat cover
The surface of the sealing surface is Flat Face Full Face, suitable for occasions where the pressure is not high and the medium is non-toxic.
2.Rf-abrupt sealing surface
Raised Face is the most widely used of the several types. The international standard and the European system and the domestic standard are of fixed height.
The gaskets suitable for the flange with abrupt sealing face have various non-metallic flat gaskets and coated gaskets; Metal packing; Wound gasket (including belt outer ring or belt inner ring), etc.
3.M/FM- convex and concave sealing surface
Male Face and Female Face are a pair of sealing surface types, one Female and one Male, which must be used together. It is convenient for matching when loading, and can also prevent the gasket from being extruded. Suitable for high pressure situations.
The sealing gaskets applicable to the sealing surface of concave and convex surface are: all kinds of non-metallic flat gaskets and cladding gaskets; Metal packing; Basic type or with inner ring type winding main piece.
4.T/G- mortise joint sealing surface
Tongue Face and Groove Face are similar to concave and convex surface. They are also the same type of matched sealing surface. The gasket is located in the annular groove, which is restricted by the metal walls on both sides, so that it can not be squeezed into the pipe due to compression deformation of the gasket. Since the gasket is not in direct contact with the fluid medium in the tube, it is less subject to the erosion or corrosion of the fluid medium, so it can be used for high pressure, inflammable and explosive, toxic media and other occasions with strict sealing requirements. This kind of sealing face gasket is good for neutral installation, but it is difficult to process the sealing face. It is easy to damage the sealing face when replacing the gasket, and the flange must be separated in the axial direction during installation and disassembly. Therefore, the possibility of separating the flange in the axial direction should be considered in the pipeline design.
The sealing surface of tenon groove is suitable for gasket: all kinds of metal and non-metal flat gasket, metal packing gasket and basic type winding gasket.
5.RTJ(RJ)- ring connection sealing surface
Ring to be Face RTJ sealing flange, also belong to the narrow Face of the flange, and make a Ring on the flange of the trapezoidal channel as the flange sealing surface, and the surface of the mortise flange, the flange must in the axial direction when installation and disassembly separate flange, therefore, should be considered in the design of the pipeline to separate flange in axial.
This sealing surface is specially designed to cooperate with the solid metal gasket which is processed into octagonal or oval shape by the metal material to realize the sealing connection. Because the metal ring pad can be based on the inherent characteristics of various metals, so the sealing performance of the sealing surface is good, the installation requirements are not too strict, suitable for high temperature, high pressure conditions, but the processing accuracy of the sealing surface is high.
Haihao Group produces a variety of sealing flange, more than 30 years of production experience, the understanding of flange professional enough, welcome to the need of customers to consult and buy.