Introduction
Butterfly Valve is a kind of valve whose closing member is a disc and a stem, which is a common type of valve in the industry. It is widely used in various fluids, such as oil, gas, water, steam, hot air and other media, as throttling and switch control valves. It has the advantages of simple structure, small size, light weight, low cost, easy operation and maintenance etc. Butterfly valve is suitable for high frequency operation, simple structure, beautiful appearance, elegant and delicate. Its sealing surface is line contact, good sealing performance, small resistance, large flow capacity and long service life. It is mainly used for cutting off and connecting pipeline in medium such as oil, water, air and steam. In the construction of modern industrial buildings and urban pipelines, butterfly valve plays an important role in controlling and regulating the flow of fluid.
Butterfly valve structure and working principle
Butterfly valves are mainly composed of valve body, butterfly plate, valve stem and valve seat, etc. The butterfly plate has the advantages of simple structure, light weight and convenient installation and maintenance. It is a valve with excellent sealing performance and reliable performance. The movement of the butterfly valve opening and closing is realized by rotating the spindle. The butterfly plate is fixed on the spindle, and the spindle is driven by the actuator to rotate around its own axis. When the angle of the butterfly plate is 0° against the flow direction, it is in the closed position; When the angle is 90° against the flow direction, it is in the open position. The rotating angle change of the butterfly plate between 0° and 90° realizes the switching and controlling of the flow of the medium. When not in use, due to the action of the medium pressure and the valve spring, the butterfly plate can be automatically closed.
Application environment
Butterfly valves are widely used in food, medicine, chemical industry, ships, municipal engineering and other industries, and the medium temperature is generally -25~150℃. It is widely used for cutting off or connecting pipeline in pipeline system, but it is not suitable for media with high viscosity and high corrosion. In addition, butterfly valves are widely used in buildings, water supply and drainage systems, firefighting and other fields. Engineering construction experienced several stages of development, and application environments of butterfly valves had to be more complex, ranging from closed sealed air conditioning systems to open rainy water supply systems with large temperature differences and environmental humidity. Especially in large public buildings, the application environment of butterfly valves is becoming more and more sophisticated. Therefore, the structure of the butterfly valve must be improved in order to ensure the normal work of the system.
Conclusion
The butterfly valve is a kind of valve which is composed of a disc, a stem, a valve body and a seat, and it is small in size, light in weight, easy in operation and low in cost. This type of valve is widely used in food, medicine, chemical industry, ships, municipal engineering and other industries. The butterfly valve has the advantages of simple structure, efficient sealing performance and strong anti-corrosion ability, and it can be used as a cutting off and regulating device for the media in the pipeline system. However, it is not suitable for media with high viscosity and high corrosivity. In addition, with the development of engineering construction, the application environment of butterfly valve has become more and more complicated, so its structure has been continuously improved in order to ensure that it can works normally under complex conditions.
