Overview The basic design parameters Nominal size: 50-2000 - mm DN, 1 ~ 78 "" Structure length: GB, ANSI B16.10. 12221-89 Nominal pressure: PN 1.0 ~ 6.4 MPa Class 150 ~ 300 lb The connection form A. the flange: JB/T 79-94. GB9112 ~ 9131 ~ 9131, HGJ 44 ~ 76-76, ANSI B16.5 B, welding, GB, ANSI B16.25. 12224-89 Use the temperature: - 40 ~ 50 ~ 450 ℃, 300 ℃, - 101 ~ 600 ℃, - 101 ~ 800 ℃ The basic error: 2.5% Back to the poor: 2% or less        Dead zones: 0.8% or less Applicable medium: water, gas, oil and corrosive medium