板式平焊法兰密封面形式
平焊环weldingoncollar突缘短节stubend,lap翻边端lappedpipeend松套板式法兰looseplateflange压力级pressurerating,pressureratingclass压力温度等级pressuretemperaturera...
平焊环weldingoncollar突缘短节stubend,lap翻边端lappedpipeend松套板式法兰looseplateflange压力级pressurerating,pressureratingclass压力温度等级pressuretemperaturera...