The structural characteristics of the centerline butterfly valve stem axis, butterfly plate center, the center of the body in the same position. Simple structure, easy to manufacture. Common rubber lined butterfly valve is a kind of. The disadvantage is that the butterfly plate and the valve seat is always in the extrusion, scratch state, large resistance, wear fast. To overcome the squeeze, scratch, to ensure the sealing performance, seat basically adopts elastic material such as rubber or PTFE, but also because of the sealing material by the temperature in the use of the limit, this is the reason why people think the traditional high-temperature butterfly valve.
Application of butterfly valve in corrosion protection series
Midline butterfly valve is used to achieve the pipeline system and the flow control components, has been widely used in petroleum, chemical, metallurgy, water and electricity, and many other fields.
1, the two cut stem without pin connection, simple and compact structure, very convenient maintenance and disassembly (site disassembly); dish plate with automatic on the function (on the left), the disc plate and the valve seat with little surplus amount.
2, tongue groove seat, to ensure that the body, the valve seat, the precise connection between the plate, while the seat can be easily replaced.
3, the use of the world's advanced spherical seal, seal more reliable. As the spherical seal, the valve in the opening and closing is too smooth, so reducing friction, reducing the torque, you can choose a small power drive device, thereby reducing the cost of users. At the same time to improve the service life of the valve seat (3-4 times the average centerline).
4, the valve seat flange sealing surface with large broadside, large arc structure, so that the valve can be fully adapted to fit or welded flange connection requirements, suitable for any standard flange connection.
5, stem axial positioning device, using two gaskets and a pair of open ring and spring ring structure. In this way, the valve rod can be effectively prevented from being disassembled, and the axial force can be carried at the same time.
6, stem from the two-way sealing ring, that is to prevent foreign material intrusion, while preventing the outflow of medium.
7, the shaft sleeve has the role of stem support, but also to reduce the opening and closing torque. At present, there are two kinds of axle sleeves available for users to choose, namely: Lubricating bronze, ptfe.
8, due to the body itself instead of the ordinary seat back, increasing the overall strength of the valve, so that it can reach the ordinary butterfly valve can not be achieved 20 kg nominal
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