Valve national standards are divided into mandatory national standards (GB) and recommended national standards (GB/T). Valve national standard number by the national standard code, the national standard issued by the serial number, and the national standard issued by the year (year of issue). Valve national standards include two parts: one is to regulate the manufacture, structure length, materials, etc., and the other is to standardize the structure, dimensions, each type of valve, and so on.
Valve national standard is usually categorized according to the use of valves, structural forms, actuator type, etc., and there is a corresponding standard number under each classification. For example, for water projects commonly used pressure relief valves, hydraulic control valves, butterfly valves and other valves, there are GB/T 12234, GB/T 12237, GB/T 12238 and other standards.
Valve national standard number is by the letters GB on behalf of the national standard, followed by the number and slash, the number represents the national industry code, after the slash is the standard number of the specific product.
Valve national standard mainly contains the following aspects:
- The basic requirements of the valve include the structure of the valve, working pressure, sealing performance, fire resistance and other aspects.
- Valve design standards include valve materials, dimensions, connection methods and other aspects of the design.
- Valve manufacturing standards include valve quality control, process, testing requirements and other aspects.
- Valve inspection and testing standards include the appearance of the valve test, sealing test, test conditions and other aspects.
- Valve marking, packaging, transportation standards include valve marking, packaging methods, transportation conditions and other aspects of the requirements.
Valve national standard is a mandatory standard, for the standards have been issued must be strictly enforced. Valve manufacturers in the design and manufacture of valves must operate in accordance with the relevant national standards. At the same time, the valve national standard also provides a third-party inspection agency inspection standards to ensure that the performance of the valve in line with national standards. At present, China’s valve industry has formed a national standard-based valve products and technology system, and constantly improve the quality of valves and technical level, but also for the development of China’s valve enterprises to provide an important guarantee and support.
In summary, the valve national standard is the basic standard of the valve industry, its implementation to improve the quality of valve products and technology level is of great significance. Valve manufacturers and users should strengthen the understanding and implementation of the national standard for valves, improve the production and use of valves, and promote the healthy development of the valve industry.
