Valves belong to the manufacturing industry.
Subdivision can be attributed to general equipment manufacturing - pump, valve, refrigeration compressor, and similar machinery and equipment manufacturing - valve and plug valve manufacturing
The valve is a control system in the liquid transportation system, which has the functions of stopping, adjusting, draining, avoiding backflow, stabilizing the pipe, separating or overflowing, and releasing pressure.
Industry (or industrial chain) refers to all enterprises engaged in economic activities with the same characteristics. The industry classification in my country is based on the national industry standard "Social and Economic Industry Classification" (GB/T 4754-2011).
The norm divides socio-economic industries according to unbiased criteria. That is to say, each industry type is divided according to the characteristics of the same economic activity, rather than according to the establishment, enterprise accounting system, or department management system.
GB/T 4754 divides industries according to categories, major categories, middle categories, and minor items, and assigns each industry an industry code:
C3443 is the industry code for valve manufacturing.
The actual meaning of the code is as follows: Type code: C manufacturing means that it becomes a new product through physical or chemical reaction, whether it is transmission equipment manufacturing or hand-made manufacturing.
Whether the equipment is sold in the wholesale market of the manufacturer or retailed, it is regarded as a variety of finished products in the manufacture of engineering buildings, and the manufacture of parts and components should be regarded as manufacturing. However, at the construction site of prefabricated engineering buildings, key components are assembled into highway bridges, warehouse equipment, railway lines and elevated highways, elevator cars and elevators, pipeline equipment, sprinkler equipment, heating equipment, natural ventilation equipment and central air conditioning equipment, lighting Assembly-themed activities such as lamps and installation of cables, as well as engineering and construction equipment, are included in the engineering and construction-themed activities.
