The difference between Sanitary Butterfly Valve and ordinary butterfly valves is mainly reflected in the following aspects:

1. Design and structure
Ordinary butterfly valve: The design is mainly based on durability and cost-effectiveness, suitable for general industrial scenarios. There are usually dead corners inside it, and impurities are easily left when the fluid flows through, which makes cleaning more complicated.
Sanitary butterfly valve: It adopts a dead-angle-free design, and the inner wall is smooth and polished (Ra value is generally less than 0.8μm), which can effectively avoid impurity accumulation and bacterial growth. It supports on-site cleaning and on-site sterilization operations, significantly improving the hygiene and easy cleaning of the equipment.
2. Material selection
Ordinary butterfly valve: It is usually made of cast iron, carbon steel or ordinary stainless steel, which can meet the requirements of durability and mechanical strength.
Sanitary butterfly valve: 316L stainless steel is mostly used, which has excellent corrosion resistance and non-toxicity, and is suitable for contact with media with high cleanliness requirements such as food and medicine. All materials must comply with food and drug industry standards (such as FDA certification).
3. Production process
‌Ordinary butterfly valve‌: The processing accuracy is general, the inner wall may be rough, there are occasional gaps in the welding parts, and the cleanliness requirements are not high.
‌Sanitary butterfly valve‌: The production process requirements are extremely high, and the interior needs to be precisely polished to achieve seamless welding and high surface finish. At the same time, the product needs to be produced in a clean environment to prevent external pollution.
4. Application scenarios
‌Ordinary butterfly valve‌: Commonly used in water treatment, heating and gas supply, petrochemical industry and other occasions, the medium can be ordinary liquid, gas or non-corrosive chemicals.
‌Sanitary butterfly valve‌: Mainly used in industries with high cleanliness requirements, including food and beverage, pharmaceuticals, bioengineering, cosmetics and other fields, for conveying high-cleanliness media such as dairy products, liquid medicine, and pure water.
5. Performance and characteristics
‌Ordinary butterfly valve‌: It has the characteristics of simple structure, small size, light weight, and easy operation, but the sealing performance and cleanliness are relatively poor.
‌Sanitary butterfly valve‌: In addition to the basic characteristics of ordinary butterfly valves, it also has higher sealing performance and cleanliness, and can meet the production environment with high cleanliness requirements‌.

In summary, there are significant differences between sanitary butterfly valves and ordinary butterfly valves in design and structure, material selection, production process, application scenarios, performance and characteristics. When choosing, comprehensive consideration should be given to the specific use environment and requirements.