Standards are documents developed and approved by a recognized agency. It defines rules, guidelines or special values ​​for the results of activities or activities for common and repeated use to achieve the best order effect in the intended area. The formulation and types of standards are divided into international standards, regional standards, national standards, professional standards, local standards, and enterprise standards according to the scope of use.
In the development of standards, China has actively participated in international standardization activities. After years of efforts by all sectors of society, China's status and influence in international standardization activities have also increased significantly. On September 21, 2013, members of the China Standardization Committee, Vice Chairman of the International Steel Association, and General Manager of Anshan Iron and Steel Group Zhang Xiaogang were elected as ISO chairpersons. This is the first time since ISO was founded in 1947, 66 years ago, the highest position of the Chinese in this international organization is currently in the International Organization for Standardization (ISO).
All industries in China are striving for the right to speak in international standards and vigorously promote the development of standardization. The water meter in the instrument is no exception. In order to be in line with international standards, China's water meter standards have been modified several times, and the documents have been equivalently adopted as equivalent international recommendations and international standards to improve the standardization of China's water meter industry.
With the development of technology, a variety of instruments have emerged. In order to better manage water meters, the national standards for water meters have been revised in 1996 and 2007. In the amendments, all international standards have been adopted as equivalents or equivalents, and the existing water meter technical regulations have been revised and supplemented for the newly emerged varieties of water meters in order to promote the development of the water meter industry. According to the measurement principle, the water meter is divided into a mechanical water meter, a water meter with an electronic device, and an electronic water meter; the temperature is divided into a cold water water meter and a hot water meter; and the technology is divided into a prepaid water meter and a remote water meter, etc. Different water meters have different standards .
In the new national standards for water meters, the new national standard has changed significantly compared to the original national standard. There are nine changes to the new national standard, including “re-regulation of the flow parameters and their relationship with the water meterâ€. Changes in this area directly affect the water metering requirements (measurement characteristics, maximum allowable errors) and technical requirements (materials and structures, durability, verification devices). Therefore, the reasonable selection of the flow parameters of the water meter is an important basis for the measurement and technical, test and verification of the water meter, and it is also an important indicator of the quality level of the water meter.
The revision of standards has played a positive role in advancing water meter companies and water meter industries, and has also further promoted the internationalization of water meter standards.
In addition to the type and model, the water meter standard is reflected in the verification and installation of the water meter. The current valid version of the water meter verification procedures is JJGl62-1985 "Water Meter and Test Equipment", JJG258-1988 "Horizontal Airfoil Water Meter", JJG585-1989 "High Pressure Water Meter" and JJG686-1990 "Hot Water Meter". The four procedures are represented by JJGl62-1985 Water Meter and Test Apparatus.
The continuous development of standards promotes the progress of the industry; the revision of standards promotes the internationalization of standards.
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