BUTTERFLY VALVE WORKING PRINCIPLE

Butterfly Valves is a kind of valve that uses a disc opening and closing member to reciprocate about 90° to open, close or adjust the flow of the medium. Butterfly valve not only has simple structure, small size, light weight, low material consumption, small installation size, small driving torque, simple and fast operation, but also has good flow regulation function and closing sealing characteristics at the same time. One

of the fastest valve varieties. Butterfly valves are widely used. The variety and quantity of its use are still expanding, and it is developing towards high temperature, high pressure, large diameter, high sealing performance, long life, excellent adjustment characteristics, and multi-function of one valve. Its reliability and other performance indicators have reached a high level.

　　With the application of chemically resistant synthetic rubber on the butterfly valve, the performance of the butterfly valve has been improved. Since synthetic rubber has the characteristics of corrosion resistance, erosion resistance, dimensional stability, good resilience, easy forming, and low cost, synthetic rubber with different properties can be selected according to different use requirements to meet the working conditions of butterfly valves.

　　Because polytetrafluoroethylene (PTFE) has strong corrosion resistance, stable performance, not easy to age, low friction coefficient, easy to form, and stable in size, and its comprehensive properties can be improved by filling and adding appropriate materials, resulting in better strength and friction. The butterfly valve sealing material with a lower coefficient overcomes the limitations of synthetic rubber, so the polymer materials represented by PTFE and its filling and modified materials have been widely used in butterfly valves, so that the performance of butterfly valves is improved. It has been further improved, and a butterfly valve with a wider temperature and pressure range, reliable sealing performance and longer service life has been produced.

　　In order to meet the application requirements of high and low temperature, strong erosion, long life and other industrial applications, metal-sealed butterfly valves have been greatly developed. With the application of high temperature resistance, low temperature resistance, strong corrosion resistance, strong erosion resistance, and high-strength alloy materials in butterfly valves, metal-sealed butterfly valves have been widely used in industrial fields such as high and low temperature, strong erosion, and long life. Butterfly valves with large diameter (9~750mm), high pressure (42.0MPa) and wide temperature range (-196~606℃) have appeared, thus bringing the butterfly valve technology to a whole new level.

　　When the butterfly valve is fully opened, it has less flow resistance. When the opening is between about 15° and 70°, sensitive flow control can be performed, so in the field of large-diameter adjustment, the application of butterfly valves is very common.

　　Because the movement of the butterfly plate is wiping, most butterfly valves can be used for media with suspended solid particles. Depending on the strength of the seal, it can also be used for powdered and granular media.

　　Butterfly valves are suitable for flow regulation. Because the pressure loss of the butterfly valve in the pipe is relatively large, which is about three times that of the gate valve, when selecting the butterfly valve, the influence of the pressure loss of the pipeline system should be fully considered, and the strength of the butterfly plate to withstand the pressure of the pipeline medium should also be considered when it is closed. . In addition, the operating temperature limitations of the elastomeric seat material at elevated temperatures must also be considered.

　　Butterfly valves have small structural length and overall height, fast opening and closing speed, and good fluid control characteristics. The structure principle of butterfly valve is most suitable for making large diameter valve. When the butterfly valve is required to be used for flow control, the most important thing is to correctly select the specification and type of the butterfly valve so that it can work properly and effectively.

　　Generally, in throttling, regulating control and mud medium, it is required to have short structure length, fast opening and closing speed, low-pressure cut-off (small pressure difference), and a butterfly valve is recommended. Butterfly valve can be used in two-position adjustment, reduced diameter channel, low noise, cavitation and vaporization, a small amount of leakage to the atmosphere, and abrasive medium. Throttling adjustment under special working conditions, or strict sealing, severe wear, low temperature (cryogenic), and other working conditions.

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