Flange (Flange) also known as flange or flange. The flange parts of the tube and pipe are connected to each other, connected to the pipe end. The holes and bolts in the flange abuts the two flanges. Sealing gaskets between flanges. Flange screw connection (wire tapping) flanges and welded flanges. By the production of materials can be divided into: WCB (carbon steel), LCB (low temperature carbon steel), LC3 (3.5% nickel steel), WC5 (1.25% 0.5% chromium molybdenum steel), WC9 (2.25% chromium), C5 (5% Cr% Mo), C12 (9% chromium, 1% molybdenum), CA6NM (412% chrome steel), CA15 (4) (12% Cr), CF8M (316 stainless steel), the CF8C (347 stainless steel), CF8 (304 stainless steel) , CF3 (304L stainless steel), CF3M (316L stainless steel), CN7M (alloy steel), M35-1 (Monel), N7M (hastelloy B), CW6M (the Hasta nickel alloy C), CY40 (due to Inconel) flanged connections (flange joint) by a pair of flanges, a gasket and a number of bolts and nuts. Gasket on the sealing surface between the two flanges, tighten the nut, than the pressure on the gasket surface deformation reaches a certain value, and fill the sealing surface uneven, the connection does not leak tight. Flange connection is a detachable connection. The connected components can be divided into the container flange and pipe flange; by structure type, with integral flange, loose flanges and threaded flange. The common integral flange welded flange and welded flange. Less rigid flat welding flange, pressure p ≤ 4MPa occasions; welded flange, also known as high-neck flange, greater rigidity, suitable for high pressure and temperature of the occasion. Type of flange sealing surface in three ways: a flat sealing surface, apply pressure is not high, medium non-toxic occasions; bump sealing surface for at a slightly higher pressure of the occasion; tongue and groove sealing surface, suitable for flammable, explosive, toxic media applications the technical parameters seal Nominal pressure PN, MPa (bar) 0.6 1.0 1.6 2.5 4.0 6.4 convex surface (MFM) DN1300 to 3000 DN300 to 3000 DN400 to DN300 2000 to 800 tongue and groove surface (TG) DN1300 to 3000 DN300 ~~ 3000 DN300 to 3000 DN300 ~ 800 plane (FF) DN300 ~ 3000 DN300 ~ 3000 DN300 ~ 3000 DN300 ~ 800 flat welding flange plate flat welding flange, with neck flat welding flange, weld neck flanges. Flat welding flange for nominal pressure no more than 2.5MPa pipe connection. Welded flange sealing surface can be made smooth, bump and tenon slot three smooth flat welding flange. used for medium conditions more relaxed, such as low-voltage non-compressed air, low pressure circulating water purification. Flange standard: HG20592-2009 (PN series) \ HG20615-2009 (CALSS series) with a neck flat welding flange (HG20592-2009 (PN series) \ HG20615-2009 (calss series), GB/T9116), the height of the neck lower carrying capacity increased stiffness of the flange. Compared with welded flange, welding capacity, electrode consumption is high, can not withstand the high temperature and pressure and repeated bending and temperature fluctuations, but the on-site installation more convenient, can be omitted weld shot wound rubbing process, the more popular. The welded flange: neck flange welding is often referred to as the hub flange. Its purpose is to transfer the pressure of the pipeline, thereby reducing Flange high stress concentration. The welding neck flange is the best designed butt due to its inherent structural value flange. Socket welding flange (SW) Socket Welding Flange sealing surface in the form: raised face (RF), bump surface (MFM), tongue and groove surface (TG), ring joint face (RJ) Material: Carbon Steel (Carbon Steel): ASTM A105, 20 #, Q235, 16Mn, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70; stainless (stainess Steel): ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti ,321,18-8; alloy steel (Alloy Steel): ASTM A182 F1, f5a, F9, F11, F12, F22, F91, A182F12 A182F11 16MnR, Cr5Mo 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, St45.8 / Ⅲ, 35CrMoV, 45CrMo. manufacturing standards: ANSI B16.5, GB/T9117.1-2000-GB/T9117.4-200, HG20592-2009 (PN series) \ HG20615-2009 (CALSS series) threaded flange Nominal diameter: DN8 to DN100 work pressure: 1.0 to 2.5 (MPa) plate threaded flange material: stainless steel, carbon steel, alloy steel. Threaded flange Uses: Suitable fire, gas, hot and cold water, air conditioning, air pipes, tubing, instrumentation, hydraulic pipes and other industrial and civil pipe thread locking and sealing. Flange cover, also known as the blind flange is the middle hole of the flange for sealed pipe plug. Sealing surface of the form of more types of flat, convex, concave and convex surfaces, tongue and groove face, ring joint face. Sealing surface: flat (FF), raised face (RF), bump surface (MFM), tongue and groove surface (TG), ring joint face (RJ) production materials: Carbon Steel (Carbon Steel): ASTM A105, 20 #, Q235 , 16Mn, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70; stainless (stainess Steel): ASTM A182 F304, 304L, F316 , 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti ,321,18-8; alloy steel (Alloy Steel): ASTM A182 F1, f5a, F9, F11, F12, F22, F91, A182F12 A182F11 16MnR, Cr5Mo 12Cr1MoV, 15CrMo, 12Cr2Mo1 A335P22, St45.8 / Ⅲ.