In pressure transmitters, level transmitters, differential pressure transmitters and other transmitters, there is a common connection – flange connection. Transmitter flange connection has a direct relationship with its use of working conditions. Flange types and standards are also diverse. Today we come together to understand the relevant knowledge of the flange. Classification of flange: Divided by material: PVC engineering plastic flange, stainless steel flange. According to the production method: forging flange, casting flange, welding flange and so on. According to the manufacturing standard: national standard (GB) (Ministry of Chemical Industry standard, petroleum standard, electric power standard), American standard (ASTM), German standard (DIN), Japanese standard (JB) and so on. The sealing form of flange: Plane flange: the sealing surface of the plane flange is a smooth plane, sometimes also on the sealing surface on the car there are two interfaces for the triangular concentric grooves (commonly known as waterline). Applicable to the plane flange gasket has a variety of non-metallic flat gasket, cladding gasket, metal clad gasket, wrapped gasket (can be at the same time with the inner ring or outer ring or inside and outside the ring). Concave-convex surface flange: the sealing surface of concave-convex flange is formed by a combination of a concave surface and a convex surface, and the gasket is placed in the concave surface, and its applicable gaskets are: all kinds of non-metallic flat gaskets, covered gaskets, metal wrapped gaskets, wrapped gaskets, wrapped gaskets (basic or with inner ring), metal wave gaskets, metal flat gaskets, and metal toothed gaskets. Compared with plane flanges, gaskets in concave-convex surface flanges are not easy to be extruded, easy to be centered when assembled, and the range of operating pressure is wider than that of plane flanges, which are used in occasions with more stringent sealing requirements. However, for the high operating temperature, sealing diameter of the equipment, the use of the sealing surface, the gasket still exists when the possibility of being extruded. Tongue and groove surface flange: Tongue and groove flange sealing surface consists of a tongue and groove surface and a groove surface with the gasket placed in the groove. Applicable gaskets are: metal and non-metallic flat gaskets, metal wrapped gaskets, winding gaskets (basic) and so on. Other sealing surface type: In addition to the flange sealing form introduced earlier, there are trapezoidal groove sealing surface, as well as with O-ring, lens pad when the special sealing surface type. When the transmitter is connected by a flange, the flange material and sealing form suitable for the working condition must be selected. Read the relevant instructions carefully before the installation of the transmitter to ensure the normal use of the site. For product consultation, product customization, agency, technical inquiries, quotations, etc., if you have any questions, please contact Star Instruments: 400-600-4496 !