Butterfly valve suitable for the occasion and how to choose?

Applicable occasions

Butterfly valves are suitable for flow regulation. Because the pressure loss of the butterfly valve in the pipeline is relatively large, the rigidity of the butterfly plate under the pressure of the pipeline medium should also be considered when closing. In addition, the working temperature limitation of elastic seat material at high temperature must also be considered. The structure length and overall height of the butterfly valve are small, the opening and closing speed is fast, and it has good fluid control characteristics. The structure principle of the butterfly valve is most suitable for making large caliber valves. When the butterfly valve is required to control the flow, the most important thing is to select the size and type of butterfly valve correctly so that it can work properly and effectively.

Usually, in the medium of throttling, regulating control and mud, the structure length is short and the opening and closing speed is fast (1/4 turn). Low pressure cut-off (low pressure difference), butterfly valve is recommended.

Butterfly valves can be used when there are two-position adjustments, shrinkage channels, low noise, cavitation and gasification, a small amount of leakage to the atmosphere, and abrasive media.

When using butterfly valves under special working conditions such as throttling regulation, strict sealing, severe wear and low temperature (deep cold), special designed metal seal belt regulating device with special triple or double eccentric special butterfly valves should be used.

Butterfly valves are suitable for freshwater, sewage, seawater, brine, steam, natural gas, food, medicine, oil products, various acids and alkalis and other pipelines which require complete sealing, zero gas test leakage, high service life and working temperature ranging from - 10 degrees to 150 degrees.

Soft-sealed eccentric butterfly valve is suitable for two-way opening and closing and regulation of ventilation and dust removal pipelines. It is widely used in gas pipelines and waterways of metallurgical, light industry, electric power and petrochemical systems.

The metal-to-metal double eccentric butterfly valve is suitable for gas, oil, acid and alkali pipelines such as urban heating, gas supply, water supply, etc., as a regulating and throttling device.

Metal-to-metal tri-eccentric butterfly valve can be widely used in petroleum, petrochemical, chemical, metallurgical, power and other fields, besides being used as a program control valve of large pressure swing adsorption (PSA) gas separation device. It is also a good substitute for gate valve and globe valve.

Selection

The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline. The butterfly valve is simple in structure, small in volume and light in weight. It is composed of only a few parts. It can be opened and closed quickly only by rotating 90 degrees. It is easy to operate. At the same time, the valve has good fluid control characteristics. When the butterfly valve is in full open position, the butterfly plate thickness is the resistance of the medium flowing through the valve body, so the pressure drop generated by the valve is very small, so it has better flow control characteristics.

If butterfly valve is required to be used as flow control, the main thing is to select the correct size and type of valve. The structure principle of butterfly valve is especially suitable for making large caliber valves. Commonly used butterfly valves are butterfly valves and flange butterfly valves. The clamp butterfly valve is connected between two pipeline flanges by double-head bolts. The flange butterfly valve is connected with flanges on the valve. The flanges on both ends of the valve are connected with bolts in the process of using the pipeline flanges.

Butterfly valve, as a component used to realize on-off and flow control of pipeline system, has been widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower and so on. In the well-known butterfly valve technology, its sealing form mostly uses the sealing structure, the sealing material is rubber, PTFE and so on. Due to the limitation of structural characteristics, it is not suitable for high temperature, high pressure, corrosion and wear resistance industries.