A端口径 B端口径 C端口径 范围 汽管 22.22/19.05/15.88 19.05/15.88/12.7 19.05/15.88/12.7/9.52 液管 12.7/9.52 12.7/9.52/6.35 12.7/9.52/6.35 汽管 28.58/25.4/22.22 28.58/25.4/22.22 22.22/19.05/15.88 液管 12.7/9.52 12.7/9.52 12.7/9.52/6.35 汽管 41.3/38.1/34.9/31.8 41.3/38.1/34.9/31.8 31.8/28.58/25.4/22.22 液管 19.05/15.88 19.05/15.88/12.7 15.88/12.7/9.52 汽管 38.1/34.9/31.8 38.1/34.9/31.8 /28.58 28.58/25.4/22.22/19.05 液管 19.05/1