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There is actually little difference between food grade and sanitary grade. The difference lies in the different licenses obtained for use.
Strictly speaking, there is no such thing as food grade, sanitary grade, it is just a customary name for the materials and products to meet the requirements of a certain use. So it's not as if you can use it in any field if it's at that level.
For example:
The main food hygiene standards in the U.S. are the 3A's and the FDA.
The U.S. Food and Drug Administration (Food and Drug Administration or FDA for short), part of the U.S. Department of Health, Education, and Welfare, is responsible for the regulation of the nation's pharmaceuticals, foods, biological products, cosmetics, veterinary drugs, medical devices, and diagnostic supplies. The FDA is responsible for the management of drugs, food, biological products, cosmetics, veterinary drugs, medical devices, and diagnostic supplies.
The U.S. Sanitary 3A certification standards. 3A Sanitation Standards Incorporated (3-A SSI) is a non-profit, collaborative organization dedicated to advancing sanitary design for food manufacturing equipment, beverage manufacturing equipment, dairy equipment, and equipment used in the pharmaceutical industry, with a focus on promoting food safety and public **** safety.
It can be seen that the FDA focuses on materials while 3A focuses on the design of the equipment. It can be assumed that 3A certified is sanitary and FDA certified is food grade. But when carefully compared, there is really not much difference.
In our country, the relevant regulations and management is still relatively backward, on the butterfly valve used for food-related, there are roughly two aspects of the standard:
GB 16798-1997 "Food Machinery Safety and Health". This standard emphasizes the structure of the equipment (such as the following excerpt of the washable requirements) and only harmless requirements for the material, there is no specific technical indicators and inspection standards. Butterfly valves that meet this standard can be called sanitary butterfly valves.
"Food safety national standards" GB 4806.x series of standards. For example:
GB 4806.1-2016 National Standard for Food Safety General Safety Requirements for Food Contact Materials and Products
GB 4806.6-2016 National Standard for Food Safety Plastic Resins for Food Contact
GB 4806.9-2016 National Standard for Food Safety Metal Materials and Products for Food Contact
That is to say, all the materials used in the manufacture of butterfly valves can be called "food-grade" butterfly valves if they meet the standard. If the above two requirements are met, it can be called "food sanitary" butterfly valve.