2023-03-07 ASME/ANSI B16.5 Flange fittings are widely used in engineering design and involve a wide range of parts. It is an essential part of pipe design, pipe fitting valves, but also is necessary component for equipment and equipment parts (such as manholes, mirror liquid level meter, etc.) . Flange fittings have good strength and sealing, simple structure, low cost, can be repeatedly disassembled, and they are widely used in industrial furnace, thermal engineering, water supply and drainage, heating and ventilation, automatic control and other fields.