Butterfly Industrial Valves, also called the flap valve is a kind of simple structure of the regulator, can be used for low pressure pipeline medium of the butterfly valve is closed switch control. ( Disc or disc) As the disc, shaft rotation around the valve to open and close a Industrial Valves. The valve can be used to control air, water, steam, all kinds of corrosive medium, mud, oil, liquid metal and radioactive medium, etc. All types of fluid flow. Mainly in the line cut off and throttling effect. Butterfly valve opening and closing is a disc-shaped butterfly plate, the body rotation around its own axis, so as to achieve the aim of opening and closing or adjust. Butterfly valve structure is mainly composed of valve body, Industrial Valves stem, disc and seal ring. The body is cylindrical, short axial length, built-in butterfly plate. Butterfly valve features 1, has simple structure, small volume, light weight, material consumption province, small installation size, small quick, 90 ° reciprocating rotary switch, low driving torque, etc, used for truncation, connected, regulate medium in pipe has good flow control characteristics and close the sealing performance. 2, butterfly can transport mud in the apertures least accumulated liquid. Under low pressure, can achieve good sealing. Adjust the good performance. 3, butterfly plate the streamline design, make the loss of the fluid resistance is small, is a kind of energy-saving products. 4, stem for stem structure, through conditioning processing, has the good comprehensive mechanical properties and corrosion resistance, abrasion resistance. When the butterfly valve opening and closing the valve stem make rotation movement up and down and run, not only the valve stem packing is not easy to damage, reliable sealing. With the butterfly plate fixed cone pin, overhanging end to prevent rushed out of the design, in order to avoid in the stem and disc joint stem collapse accident broke out. 5, connection flange connection, connected to the clamp lugs, butt welding, and connected to the clamp. Driving type is manual, worm gear drive, electric, pneumatic, hydraulic and electric hydraulic linkage actuator, which can realize remote control and automation. Advantage 1, convenient and quick for opening and closing, and effort, fluid resistance small, can often operation. 2, simple structure, small dimension, length short structure, small volume, light weight, suitable for large diameter of the valve. 3, can transport the mud, the apertures least accumulated liquid. 4, low pressure, can achieve good sealing. 5, good regulation performance. 6, wide open seat effective circulation channel area is larger, the fluid resistance is small. 7, open-close torque is small, due to the rotation axis disc basic equal role by the medium, to produce torque in the opposite direction, thus opening and closing more effort. 8, rubber, plastic, commonly used seal face material so low pressure sealing performance is good. 9, installation is convenient. 10, flexible operation, energy saving, can choose manual, electric, pneumatic, hydraulic way. Now due to the development of science and technology and the progress of material science, making the material of butterfly valve is more and more diverse. The user when selecting a butterfly valve, index of material is its considerations often very important. Then, in the case of not rely on the manufacturers instructions, the user how to identify the material of butterfly valve itself? The material of butterfly valve differential method 1. Chemical and spectral analysis by using chemical analysis to the butterfly valve is material to determine the content of various elements in the very early has some method, and the use of this method according to the long time is very reliable, so to speak. And spectral analysis refers to the butterfly valve material is under the excitation of high temperature and high energy emission spectrum, so using spectral analysis can determine the material of butterfly valve. 2. Spark to identify grinding of the metal material, often because of severe friction and spark generation. And the methods to identify it is depend on the butterfly valve material, polishing, depends on identifying the characteristics of the spark to identify the composition of the material. 3. Section of butterfly valve samples cut from the section on colour and lustre, grain and other feature can distinguish the valve material content of various elements in, but this method often requires a certain metal materials manufacturing experience of talent can do it. Disadvantages 1, working pressure and working temperature range is small. 2, poor sealing. Butterfly valve can be divided into the form of the structure of offset plate, vertical plate, inclined plate and lever. According to the type seal form can be soft seal and hard seal type two kinds. Soft seal type generally use rubber ring seal, metal hard seal type usually adopt ring seal. According to the connection type can be divided into flange and clamp connection; According to the methods can be divided into manual transmission, gear transmission, pneumatic, hydraulic and electric.
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