Shanghai Tongyang Pipe Fittings Co.,Ltd., a manufacturers supplying for gas & oil field, is specialized in research, development and production of Monolithic Insulating Joint, Insulating flange, Forged pipe fittings, Hydraulic fittings, butt-welding pipe fittings, Forged Flanges, Hydraulic Flanges ect in material of carbon steel, stainless steel and alloy steel. Tongyang products are mostly used in field of Petroleum, Natural Gas, petrochemical, Power station, shipbuilding sectors as well as ...