FF-平面带颈承插焊钢制管法兰

FF-Socket Welding Flange

RF-突面带颈承插焊钢制管法兰

RF-Socket Welding Flange

MF-凹凸面带颈承插焊钢制管法兰

MF-Socket Welding Flange

TG-榫槽面带颈承插焊钢制管法兰

TG-Socket Welding Flange

RJ-环连接面带颈承插焊钢制管法兰

RJ-Socket Welding Flange