DIN 16831-7-2004《压力管用聚丁烯(PB)的管接头和管件 PB125 第7部分：法兰接头、法兰、座焊接用密封环.尺寸》

This standard specifies dimensions and tolerances for injection-moulded bushings with a standard dimen-
sion ratio SDR of 11, and flanges for socket welding (including flange assemblies) as in DIN 16831-5, and
for the appropriate sealing elements, for jointing pressure pipes made from type PB 125 polybutene, as speci-
fied in DIN 16968 and DIN 16969, or for jointing such pipes with pipes made of different materials.
NOTE Any relevant European Standards shall be observed.