1, Gao Lan Valve (founded in 1966, a state-level high-tech enterprise, a well-known trademark in China, a famous brand in Gansu Province, and one of the top ten valves, Lanzhou High-pressure Valve Co., Ltd.).
2. Jiang Yi (national high-tech enterprise, China famous trademark, Zhejiang famous trademark, Zhejiang famous brand product, one of the key enterprises in China valve industry, Jiangnan Valve Co., Ltd.).
3. Aimeike (China famous trademark, one of the largest copper valve production and export bases in China, Zhejiang famous trademark, Zhejiang famous brand, Ningbo Aimeike Group Co., Ltd.).
4. Shangfa SF (Vice Chairman of Valve Branch of China General Machinery Association, one of the key enterprises in the national valve industry and one of the top ten valve brands in China, Shanghai Valve Factory Co., Ltd.).
5. Set up a brand (China well-known trademark, Tianjin famous trademark, export inspection-free, group company integrating scientific research, production, sales, storage and transportation, import and export operation, Tianjin Dazhan Group Co., Ltd.).
6.Napus (a high-tech enterprise, a famous trademark in Zhejiang Province, a vice-chairman unit of China General Machinery Association, a large-scale backbone enterprise, Zhejiang Yuhuan Warm Union Valve Factory).
7. Work badge (founded in 1946, Shanghai famous trademark, Shanghai famous brand, industry influential brand, 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 that manufactures high and medium pressure valves and traps, a top 500 enterprise in China, and Beijing Valve General Factory Group Co., Ltd.).
9. Dagao (founded in 1956, China well-known trademark, national high-tech enterprise, national key equipment key valve localization supporting unit, Dalian Dagao Valve Co., Ltd.).
10, Feiqiu (1958, one of the largest valve manufacturers in China, a high-tech enterprise, a famous brand in Sichuan Province, Zigong High-pressure Valve Co., Ltd.).
Valve specification requirements
1, and the model of the valve shall indicate the requirements of the national standard number. If it is an enterprise standard, it shall indicate the relevant description of the model.
2. The working pressure of the valve shall be equal to or higher than that of the pipeline. Under the premise of not affecting the price, the working pressure that the valve can bear should be greater than the actual working pressure of the pipeline.
3. The valve manufacturing standard shall indicate the number of the national standard on which it is based. If it is an enterprise standard, the purchase contract shall be accompanied by enterprise documents.
Performance test requirements
1. When a valve of a certain specification is manufactured in batch, an official institution shall be entrusted to test the following performance: ① the opening and closing torque of the valve under working pressure; ② Detection of valve flow resistance coefficient under the condition of pipeline water delivery.
2. Before the valve leaves the factory, the following tests should be carried out: ① When the valve is opened, the valve body should bear an internal pressure test twice the working pressure of the valve; ② When the valve is closed, both sides bear 1 1 times the working pressure of the valve without leakage; However, the leakage value of metal sealing butterfly valve is not greater than the relevant requirements.