DN3000 BUTTERFLY VALVE

Butterfly valve  is a fluid switch that uses a disc-type opening and closing member to turn back and forth about 90 degrees, usually in liquid, gas, and other fluid piping systems as a blocking open, flow control valve and damping valve function. Large-diameter butterfly valves are valves with a diameter greater than 100cm or more.

The original butterfly valve is a simple, and poorly closed stopper valve, simple fluid regulation switch

With the progress of science and technology civilization, now the butterfly valve is not only simple structure, small volume, light weight, material consumption saving, small installation size, and small driving torque, easy and rapid operation, and can also have good flow apodization function and closing sealing characteristics at the same time, is one of the fastest growing valve varieties in the last decade or so. Especially in the United States, Japan, Germany, France, Italy and other industrially developed countries, the use of butterfly valves is very widespread. Its use of varieties and quantities continue to expand, and to acid and alkali resistance, high temperature, high pressure, large diameter, high sealing, long life, excellent adjustment characteristics and a valve multi-functional direction, its reliability and other performance indicators have reached a high level, and has partially replaced the globe valve, gate valve and ball valve. With the progress of butterfly valve technology. In the foreseeable short period of time, especially in the medium and large caliber, low and medium pressure fields of use, butterfly valve will become the dominant form of valve.

The butterfly plate of large diameter butterfly valve is installed in the direction of the diameter of the pipe. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, the rotation angle is between 0°-90°, and when it rotates to 90°, the valve is fully open.

Large-diameter butterfly valve, butt-clamp butterfly valve is simple in structure, small in size, light in weight, and consists of only a few parts. And only need to rotate 90° to open and close quickly, simple operation, while the valve has good fluid control characteristics. When the butterfly valve is in fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated through the valve is small, so it has good flow control characteristics. The butterfly valve has two sealing types: elastic seal and metal seal. For resilient seal valves, the seal can be set on the valve body or attached to the butterfly plate perimeter.

Valves with metal seals generally have a longer life than those with resilient seals, but it is difficult to achieve complete sealing. Metal seals can accommodate higher operating temperatures, while resilient seals have the drawback of being limited by temperature.

If a butterfly valve is required to be used as a flow control, the main thing is to choose the correct size and type of valve. The structure principle of butterfly valve is especially suitable for making large diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical and water treatment, but also in cooling water systems of thermal power stations.

There are two kinds of butterfly valves in common use, namely, butt-clamp butterfly valve and flange butterfly valve. The butt-clamp butterfly valve is connected between two pipeline flanges with double-headed bolts, and the flanged butterfly valve is with flanges on the valve, and the flanges on both ends of the valve are connected to the pipeline flanges with bolts.