The butterfly valve has a small flow resistance when fully opened. When the opening is between about 15° and 70°, sensitive flow control is possible, so the application of butterfly valves is very common in the field of large-diameter adjustment.

List of content for this article：

1.What is Butterfly valve?

2.Butterfly valve how it works

What is Butterfly valve?

Butterfly valve is also known as the flip valve, is a simple structure of the regulating valve, can be used for low-pressure pipeline medium switch control butterfly valve refers to the closing parts (disc or disc) for the disk, around the valve shaft rotation to open and close a valve.

Valve can be used to control the flow of air, water, steam, corrosive medium, mud, oil, liquid metal and radioactive medium. In the pipeline, it mainly plays the role of cutting and throttling. Butterfly valve open and close piece is a disc-shaped butterfly plate, in the body around its own axis rotation, so as to achieve the purpose of open and close or adjustment.

Butterfly valve is a disc - type open and close parts reciprocating rotation of 90° or so to open, close or adjust the flow of a valve medium. Butterfly valve not only simple structure, small size, light weight, material consumption province, small installation size, small driving torque, easy to operate, fast, and can also have a good flow regulation function and close sealing characteristics, is one of the fastest development of valve varieties in recent decades. Butterfly valve is widely used. The variety and quantity of its use are still continuing to expand, and to high temperature, high pressure, large diameter, high sealing, long life, excellent regulation characteristics, and multi-function development of a valve. Its reliability and other performance indexes have reached a high level.

Butterfly valve how it works

In order to meet the requirements of industrial applications such as high and low temperature, strong erosion and long life, metal sealing 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 sealing 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°C) have emerged, which has brought the butterfly valve technology to a new level.

Due to the wiping nature of the butterfly disc movement, most butterfly valves can be used for media with suspended solid particles. Depending on the strength of the seal, it can also be used in powdered and granular media.

The butterfly valve is suitable for flow regulation. Since the pressure loss of the butterfly valve in the pipe is relatively large, 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 pressure of the disk under the closing of the disk should also be considered. . 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 large diameter valves. When a butterfly valve is required for control flow, the most important thing is to correctly select the size and type of the butterfly valve so that it can work properly and efficiently.

Generally, in throttling, regulating control and mud medium, the structure length is short, the opening and closing speed is fast, and the low pressure is cut off (the pressure difference is small). It is recommended to use a butterfly valve. Butterfly valves are available for two-position adjustment, reduced diameter channels, low noise, cavitation and vaporization, small leakage into the atmosphere, and abrasive media. Throttling adjustment under special working conditions, or requiring strict sealing, severe wear, low temperature (deep cooling) and other working conditions.

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