Difference between butterfly valve and check valve

1. Different structure

Butterfly valve is a rotary valve, composed of disc disc, stem and seat. The disc rotates through the stem to open and close the pipe. The check valve is composed of the valve body, valve disc, spring, etc., the valve disc through the flow of the medium, so as to achieve one-way flow of the pipeline.

Second, characteristics and applications are different

1. Characteristics and application of butterfly valve

The butterfly valve has the characteristics of small size, light weight and easy operation, and is widely used in various pipeline systems, such as water, gas, chemical, construction, food and other industries. Especially in large diameter pipelines, the advantages of butterfly valves are more obvious, which can replace traditional globe valves, check valves, etc.

2. Characteristics and application of check valve

Check valves are mainly used to protect pipelines, pumps and compressors to prevent reverse flow and water shock. It has the characteristics of simple structure, good sealing and high reliability, and has been widely used in petroleum, chemical, pharmaceutical, sewage treatment and other industries.

3. The use of different scenarios

The butterfly valve is more commonly used in the medium flow of the reversing pipe, because its opening and closing speed is fast, and the resistance to the fluid is relatively small, it is not easy to run noise, so it is suitable for controlling the flow rate. Check valves are often used in liquid and gas pipelines to control the one-way flow of media.

4.Different installation methods

The butterfly valve is generally welded directly on the pipe, and can also be fixed by the valve stem and pin. The check valve must be installed in the pipe system, with one end connected to the pipe and the other end connected to the valve.