The content is as follows:

1. Langao Valve (founded in 1966, a national high-tech enterprise, a well-known trademark in China, a famous trademark in Gansu Province, a famous brand in Gansu Province, and one of the top ten valve brands , Lanzhou High Pressure Valve Co., Ltd.).

2. Jiangyi (national high-tech enterprise, well-known trademark in China, famous trademark in Zhejiang Province, famous brand product in Zhejiang Province, one of the key enterprises in China's valve industry, Jiangnan Valve Co., Ltd.).

3. Aimeike (a well-known trademark in China, one of the largest copper valve production and export bases in China, a famous trademark in Zhejiang Province, a famous brand in Zhejiang, Ningbo Aimeike Group Co., Ltd.).

4. Shanghai Valve SF (the vice-chairman unit of the Valve Branch of China General Machinery Association, one of the key enterprises in the national valve industry, one of the top ten valve brands in China, Shanghai Valve Factory Co., Ltd.).

5. Lipai (China's well-known trademark, Tianjin famous trademark, export inspection-free, a group company integrating scientific research, production and sales, storage and transportation, import and export operations, Tianjin Dazhan Group Co., Ltd.).

6. Naps (high-tech enterprise, Zhejiang famous trademark, vice-chairman unit of China General Machinery Association, large-scale backbone enterprise, Zhejiang Yuhuan Nuanlian Valve Factory).

7. Gongpai (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 manufacturing high and medium pressure valves and steam traps, one of the top 500 Chinese machinery companies, Beijing Valve Factory Group Co., Ltd.).

9. Dagao (founded in 1956, Dalian Dagao Valve Co., Ltd., a well-known trademark in China, a national high-tech enterprise, and the backing unit for the localization of key valves for national key equipment).

10. 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, Zigong High Pressure Valve Co., Ltd.).

Valve specification requirements

1. The valve model should indicate the national standard number requirements based on it. If it is an enterprise standard, the relevant description of the model should be indicated.

2. The working pressure of the valve must be ≥ the working pressure of the pipeline. Without affecting the price, the working pressure that the valve can withstand should be greater than the actual working pressure of the pipeline.

3. The valve manufacturing standard should indicate the national standard number it is based on. If it is an enterprise standard, the enterprise document should be attached to the procurement contract.

Performance testing requirements

1. When a valve of a certain specification is manufactured in batches, an official agency should be entrusted to conduct the following performance testing: ① The opening and closing torque of the valve under working pressure conditions; ② Detection of the flow resistance coefficient of the valve under pipeline water transmission conditions.

2. The valve should undergo the following tests before leaving the factory: ① When the valve is open, the valve body should withstand an internal pressure test that is twice the valve working pressure; ② When the valve is closed, both sides They can withstand 11 times the working pressure of the valve without leakage; however, for metal-sealed butterfly valves, the leakage value is not greater than the relevant requirements.