The sanitary butterfly valve fittings have multiple connection methods to meet the requirements of different industries and application scenarios. The following are some common connection methods: 

1. Clamp Connection: 

Use clamps to quickly connect the valve to the pipeline. 

Installation and disassembly are very convenient and no tools are required. 

The design is completely seamless, making it easy to clean and disinfect. 

It is widely used in industries such as food, beverages, pharmaceuticals and cosmetics, and is suitable for situations where frequent disassembly and cleaning are required. 

2. Flange Connection: 

The flanges at both ends of the valve are fixed to the flanges of the pipeline by using bolts. 

Provide high sealing performance and pressure resistance. 

Suitable for high-pressure and high-temperature environments, often used in large pipeline systems and in situations requiring high reliability. 

3. Welding Connection: 

The valve is directly connected to the pipeline by welding. 

Provides a permanent connection with excellent sealing performance. 

Suitable for applications with extremely high requirements for sealing performance, as well as those where frequent disassembly is not necessary. 

It is commonly used in high-pressure and high-temperature environments of the chemical and pharmaceutical industries. 

4. Threaded Connection: 

The valve is screwed into the pipe by means of the thread. 

Installation is convenient, but it is not as commonly used in sanitary applications as other connection methods. 

Suitable for small-diameter pipelines and low-pressure pipeline systems. 

It is commonly used in laboratories and small-scale equipment. 

5. Tri-Clamp Connection: 

Also known as the three-piece connection, it is a special type of clamp connection method. 

It is composed of two flanges and a middle clamp. 

Easy to install and dismantle, with excellent sealing performance. 

It is widely used in industries such as food, beverages, pharmaceuticals and cosmetics, and is suitable for situations where frequent disassembly and cleaning are required. 

6. Sanitary Quick-Connect Fittings (Hygienic Fast-Assembly Connectors): 

Connect the valve to the pipe using a quick-connect fitting. 

Installation and disassembly are very convenient and no tools are required. 

The design is completely seamless, making it easy to clean and disinfect. 

Suitable for industries such as food, beverages, pharmaceuticals and cosmetics, as well as for situations where frequent disassembly and cleaning are required. 

In conclusion, the connection methods for sanitary butterfly valve fittings are diverse, and each method has its own unique advantages and applicable scope. When choosing a connection method, factors such as specific application requirements, working conditions, and budget should be comprehensively considered.