This standard specifies the flange type, size and technical requirements for ultra-high pressure valves. This standard is applicable to flanges with neutral media such as ethylene and polyethylene with a nominal pressure of PN 250 MPa.
JB/T 1308.13-1999 history
2011JB/T 1308.13-2011 PN 2500 ultrahigh pressure valves and fittings.Part 13:Flanges
1999JB/T 1308.13-1999 Type,dimensions and specifications of PN 250 MPa flanges