亘通法兰(PN20)JBI2Q 4486 2006 代替JBlZQ448奋斗m本标准运用于公称压力PN20.介质温度为-25-+80t的直通法兰。型式和尺寸见回1秘袭10.1 标记示例1公称通径DN20的直遥法兰:直通法兰20 JB/lQ 448命-却06随1遁公钩程铜管D3 A B C D DI Dz d b UI DoX5 Hll 10 18x2 55 22 9 12 18. 28 30.3 11 3.8 15 22x3 ss 22 11 16 122. 32 30.3 11 3.8 20 28 x4 S5 22 12 20 28.5 38 3S.3 11 3.8 25 34 x 5 75 28 14 24 35 45 42 .6 13 5.0 +0. +a0 2 32 423. 5SG S.到如皿8S.0X3.5SG 4. 50
