The flange material can be selected from SUS304, SUS316, and other special materials. The membrane material can be selected from 316L, tantalum sheet, Ha C, Ha B, Monel, and sprayable PTFE (tetrafluoroethylene). Optional flange standards include national standard, American standard, and chemical standard. This flange diaphragm is of internal welding type, which can protect the diaphragm from external damage.