Author:Site Editor Publish Time: 2018-12-01 Origin:Site
Butterfly valves are used in a wide range of applications and are suitable for flow regulation. Because the butterfly valve has a large pressure loss in the pipeline, it is about three times that of the gate valve. Therefore, when selecting a butterfly valve, the influence of the pressure loss of the piping system should be fully considered.
2.What To Consider
Butterfly valve is suitable for flow regulation. Because the pressure loss of butterfly valve in the pipeline is relatively large, it should also consider the solidity of butterfly plate under the pressure of pipeline medium when it is closed. In addition, consideration must be given to the operating temperature limitations of the resilient seat material at high temperatures. Butterfly valve structure length and overall height is small, open and close fast, and has good fluid control characteristics, the structure principle of butterfly valve is most suitable for the production of large diameter valve. When the butterfly valve is required to control the flow of use, the most important thing is to choose the correct size and type of butterfly valve, so that it can work properly and effectively.
Generally, short structure length and fast opening and closing speed (1/4 revolution) are required in throttling, adjusting control and mud medium. Low pressure cut-off (small pressure difference), butterfly valve is recommended.
In the two-position regulation, shrinkage mouth of the passage, low noise, cavitation and gasification phenomenon, a small amount of leakage into the atmosphere, with abrasive medium, you can choose butterfly valve.
Throttling adjustment under special working conditions, or the requirements of strict sealing, or wear serious, low temperature (cryogenic) working conditions when using butterfly valve, need to use special design of metal sealing belt adjustment device to triple eccentric or double eccentric special butterfly valve.
Butterfly valve is suitable for fresh water, sewage, sea water, salt water, steam, natural gas, food, medicine, oil, acid, alkali and other pipelines with complete sealing, zero gas test leakage, high service life requirements and operating temperature of -10 ℃ ~ 150 ℃.
Eccentric butterfly valve of soft seal is suitable for bi-directional opening and closing and regulating of ventilation and dust removal pipelines. It is widely used in gas pipelines and water channels of metallurgy, light industry, electric power and petrochemical systems.
Double eccentric butterfly valve with metal to metal sealing is suitable for city heating, gas supply, water supply and other gas, oil, acid and alkali pipelines, as an adjustment and throttling device.
In addition to being used as the program control valve of large PSA gas separation device, the three-eccentric butterfly valve is widely used in petroleum, petrochemical, chemical industry, metallurgy, electric power and other fields, and is a good substitute for gate valve and globe valve
The robustness of the pressure of the disc medium under the closing and the limitation of the working temperature of the elastic valve seat material at high temperature should also be considered. The butterfly valve has a small structural length and overall height. It opens and closes the speed block and has good fluid control characteristics. Its structural principle is most suitable for making large diameter valves. When a butterfly valve is required for control flow, the most important thing is to properly select the size and type of butterfly valve so that he can work more efficiently.
Generally, in throttling, adjustment control, and mud media, the structural length is required to be short and the opening and closing speed is fast. For low pressure cut-off, butterfly valves are recommended.
1. In the double-position adjustment, shrinkage channel, low noise, cavitation and gasification phenomenon, a small amount of leakage to the atmosphere, with corrosive medium, butterfly valve can be selected.
2. In the case of special conditions, the throttling adjustment or the strict sealing, or the use of the butterfly valve under the conditions of severe wear and low temperature, the special eccentric or double eccentric special butterfly valve of the special design metal sealing belt adjusting device is required.
3. Metal-to-metal surface sealing The triple offset butterfly valve can be widely used in the fields of petroleum, petrochemical, chemical, metallurgical, electric power, etc., in addition to being used as a large-scale pressure swing adsorption gas separation device program control valve.
4. The centerline butterfly valve is suitable for fresh water, sewage, seawater, salt water, steam, natural gas, food, medicine, oil and each that require complete sealing, zero gas leakage, high life expectancy and working temperature of -10-150 degrees. Kinds of acid and alkali and other pipelines.
5, metal-to-metal wire sealed 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 regulation of ventilation and dust removal pipelines. It is widely used in gas pipelines and waterways of metallurgy, light industry, electric power and petrochemical systems.
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