High-performance butterfly valve can be directly used to control the flow of air, water, steam, corrosive medium, mud, oil, liquid metal and radioactive medium to a certain extent. It mainly cuts off and throttles the pipeline. The opening and closing part of the butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjusting.
Extended data
Butterfly valves are widely used for flow regulation. Due to the large pressure loss of butterfly valve in the pipeline, it is about 3 times that of gate valve. Therefore, when choosing a butterfly valve, we should fully consider the influence of pressure loss on the pipeline system, the firmness of the butterfly plate under the pressure of the pipeline medium when the butterfly valve is closed, and the limitation that the elastic valve seat material can withstand the working temperature at high temperature.
The structural length and overall height of butterfly valve are small, and the opening and closing speed block has good fluid control characteristics, so its structural principle is most suitable for making large-caliber valves. When the butterfly valve is required to control the flow, the most important thing is to correctly select the size and model of the butterfly valve to make it work more effectively.
Usually, in throttling, regulating control and mud media, short structural length and fast opening and closing speed are required. It is recommended to use low pressure cut-off butterfly valve.
1. Butterfly valve can be used in situations with two-position adjustment, necking channel, low noise, cavitation and vaporization, and a small amount of leakage to the atmosphere and corrosive media.
2. When the butterfly valve is used under special working conditions, such as throttling adjustment or strict sealing, or when it is used under severe wear and low temperature, it is necessary to use a specially designed special butterfly valve with metal seal and a triple eccentric or double eccentric adjusting device.
3. Metal-to-metal triple eccentric butterfly valve can be widely used in petroleum, petrochemical, chemical, metallurgical, electric power and other fields besides being used as the program control valve of large-scale pressure swing adsorption gas separation device, and it is a good substitute for gate valve and globe valve.
4. The midline butterfly valve is suitable for pipelines with fresh water, sewage, seawater, salt water, steam, natural gas, food, medicines, oil products, various acids and alkalis, which require complete sealing, zero gas leakage, long service life and working temperature of-10- 150 degrees.
5. Metal-to-metal wire sealing double eccentric butterfly valve is suitable for urban heating, gas supply, water supply and gas, oil, acid and alkali pipelines as a regulating and intercepting device.
6. Soft eccentric butterfly valve is suitable for two-way opening and closing and adjustment of ventilation and dust removal pipelines, and is widely used in gas pipelines and waterways of metallurgical, light industry, electric power and petrochemical systems.
Baidu encyclopedia-butterfly valve