Loose flange welded ring is the use of flanging, such as the flange bearing steel ring on the pipe end, the pipe end flanges on activities. Steel ring or flange sealing surface is, the role of the flange is pressed them. Thus was blocked due to the steel ring or flange, loose flange is not in contact with the medium. Connection: Welding Material: Stainless steel flange national standards GB a, Series 1: PN1.0, PN1.6, PN2.0, PN5.0, PN10.0, PN15.0, PN25.0, PN42 (main series) b, Series 2: PN0.25, PN0.6, PN2.5, PN4.0 which PN0.25, PN0.6, PN1.0, PN1.6, PN2.5, PN4.0 total of six grades The flange dimensions flange system belongs to Germany, represented by the European flange system