Author:Site Editor Publish Time: 2018-11-30 Origin:Site
The butterfly valve is suitable for flow regulation. Since the pressure loss of the butterfly valve in the pipeline is relatively large, it should also be considered that the butterfly plate is subjected to the firmness of the pressure of the pipeline medium when it is closed.
The butterfly valve's disc is mounted in the diameter direction of the pipe. The butterfly valve is simple in structure, small in size and light in weight. It consists of only a few parts, and can be quickly opened and closed by only rotating 90°. The operation is simple, and the valves has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the disc is the resistance of the medium flowing through the valve body, so the pressure drop generated by the valve is small, so it has better flow control characteristics.
If a butterfly valve is required for flow control, the main choice is the correct size and type of valve. The structural principle of the butterfly valve is especially suitable for making large diameter valves. Common butterfly valves are clip-on butterfly valves and flanged butterfly valves. The wafer type butterfly valve uses a stud bolt to connect the valve between the two pipe flanges. The flange type butterfly valve has a flange on the valve, and the flanges on the two ends of the valve are connected to the pipe flange by bolts.
In addition, the limits of the operating temperature of the elastomeric seat material at elevated temperatures must also be considered. The butterfly valve has a small structural length and overall height, a fast opening and closing speed, and good fluid control characteristics. The structural principle of the butterfly valve is most suitable for making a large diameter valve. 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 it can work properly and 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 (1/4 turn). Low pressure cutoff (small pressure difference), butterfly valve is recommended.
In the two-position adjustment, the narrowing channel, the low noise, the cavitation and the gasification phenomenon, a small amount of leakage to the atmosphere, and an abrasive medium, a butterfly valve can be selected.
In the case of throttling adjustment under special working conditions, or requiring strict sealing, or severe wear, low temperature (deep cold) and other working conditions, the use of special design metal sealing belt adjustment device for triple offset or double offset butterfly valve.
Butterfly valve is suitable for fresh water, sewage, seawater, salt water, steam, natural gas, food, medicine, oil and various kinds of requirements that require complete sealing, zero gas test leakage, high life expectancy, and working temperature between -10 and 150 ℃ Acid and alkali and other pipelines.
The soft seal 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.
The metal-to-metal wire sealed 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 surface sealing triple eccentric butterfly valve can be widely used in petroleum, petrochemical, chemical, metallurgical, electric power, etc., as well as high-pressure transformer (PSA) gas separation device program control valve. replacement product.