Introduction: 

 The flange cover is also known as the blind flange and the blind plate. It is a flange without holes in the middle, which is used to seal the pipe plug. The function is the same as the welding head and wire buckle tube cap, but the blind flange and wire buckle pipe cap can be removed at any time, while the welding seal head is not. 

 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 steel (stainless 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; 

 Production standards: HG/T20592-2009, HG/T20615-2009, GB/T9123.1-2000, GB/T9123.2-2000, GB/T9123.3-2000, GB/T9123.4-2000. 

 Detailed introduction: 

 Flange cover (BL) sealing surface: plane (FF), protrusion surface (RF), concavex surface (MFM), tenon groove surface (TG) ring, connection surface (RJ) Production materials: carbon steel, stainless steel, alloy steel. 

 Specifications: 1/2′′～80′′ (10-2000) Pressure class: 0.6Mpa ~ 32Mpa, 150Lb ~ 2500Lb, PN0.25-PN42.0 Material: 20#, 304, 304L, 321, 316, 316L, 310S and other common standards: national standard: GB/T9112-2000 (GB9113? 1-2000～GB9123? 4-2000) American standard: ANSI B16.5 Class150, 300, 600, 900, 1500 (WN, SO, BL, TH, LJ, SW) Japanese standard: JIS 5K, 10K, 20K (PL, SO, BL, WN, TH, SW) German standard: DIN2573, 2572, 2631, 2576, 2632, 2633, 2543 Flange connection is an important connection method for pipeline construction. 

 Flange connection means fixing two pipes, pipe fittings or equipment to one flange disk first. Between the two flange plates, flange pads are added, and the flange pads are bolted together to complete the connection. Some pipe fittings and equipment already have their own flanges, which are also flange connections. 

 Flange thread connection (filament connection) flange and welding flange. Low-pressure small diameters have wired flanges, high-pressure and low-voltage large diameters are made of welding flanges. The thickness and connection bolt diameter and quantity of flange discs with different pressures are different. 

 According to different levels of pressure, flange pads also have different materials, from low-pressure asbestos pads, rubber pads, high-pressure asbestos pads to metal pads. 

 The flange connection is easy to use and can withstand greater pressure. 

 In industrial pipelines, flange connections are widely used.