Stainless steel flange is a kind of discoid parts, the most common in the pipeline engineering, flanges are used in pairs. In piping engineering, flanges are mainly used for pipeline connections. In the need to connect the pipeline, the installation of a flange, low pressure pipeline can use the wire flange, more than 4 kilograms of pressure using the welding flange. Seal the gasket between the two flanges and fasten it with bolts. Flanges with different pressures vary in thickness and use different bolts. When the pump and valve are connected with the pipe, the parts of the equipment are also made into the corresponding flange shape, also known as flange connection. In the two plane in the vicinity of the use of bolt connection and close the connection parts, generally referred to as "flange", such as ventilation pipe connection, this kind of parts can be called "flange parts."". But this connection is only part of a device, such as the flange and the pump connection, it is not good to call the pump flange parts". Relatively small, such as valves, can be called "flange parts"".