... (25.0Mpa), 2500psi (42.0Mpa), b, The public diameter: 6 ~ 4000mm c, Flange structure type: welding, socket welding, threaded ... Nominal pressure: 0.25Mpa ~ 42.0Mpa 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 PN0.25, PN0.6, PN1.0, PN1.6, PN2.5, PN4.0 flange ...