1 Langao Valve (founded in 1966, a state-level high-tech enterprise, a well-known trademark in China, a famous brand in Gansu Province, top ten brands of valves, and Lanzhou High-pressure Valve Co., Ltd.) 2 Jiangyi (a state-level high-tech enterprise, a well-known trademark in China, a famous trademark in Zhejiang Province, a famous brand product in China, and Jiangnan Valve Co., Ltd.) 3 Aimeike (a well-known trademark in China, One of the largest copper valve production and export bases in China, Zhejiang famous trademark, Zhejiang famous brand, Ningbo Aimeike Group Co., Ltd.) 4 Upper valve SF (vice chairman of valve branch of China General Machinery Association, one of the key enterprises in the national valve industry, top ten valve brands in China, Shanghai Valve Factory Co., Ltd.) 5 Power brand (China famous trademark, Tianjin famous trademark, export inspection-free, Tianjin Dazhan Group Co., Ltd., a group company integrating scientific research, production, sales, storage and transportation, import and export operations, opened the valve 6 (established in 1959, a high-tech enterprise, a famous trademark in Henan Province, a vice-chairman unit of China General Machinery Association, a large-scale backbone enterprise, and Henan Kaifeng High-pressure Valve Co., Ltd.) 7 (established in 1946, a famous trademark in Shanghai, a famous brand in the industry). A professional manufacturer of valves and valve electric devices, Shanghai Lianggong Valve Factory Co., Ltd.) 8 Jingpai (a famous trademark in Beijing, a key state-owned enterprise manufacturing high and medium pressure valves and steam traps, a top 5 enterprise in China, and Beijing Valve General Factory Group Co., Ltd.) 9 Dagao (founded in 1956, a well-known trademark in China, a national high-tech enterprise, and a supporting unit for the localization of key valves of national key equipment), Dalian Dagao Valve Co., Ltd.) 1 flying ball (in 1958, one of the largest valve manufacturing enterprises in China, a high-tech enterprise, a famous trademark in Sichuan Province, a famous brand in Sichuan, and Zigong High-pressure Valve Co., Ltd.)