Home > Knowledge > Content
Advantages and disadvantages of midline butterfly valve and its anticorrosive application
- Jul 27, 2017 -

The shortcomings of the midline butterfly valve is due to the butterfly plate and the valve seat is always in the squeeze, scratch state, resistance distance, wear fast. In order to overcome the extrusion, scratch, to ensure sealing performance, the valve seat is basically rubber or PTFE and other elastic materials, but also because of the use of sealing materials by the temperature limit, which is why people traditionally feel butterfly High temperature reasons.

The midline butterfly valve is a kind of parts used to realize the on-off and flow control of the pipeline system. It has been widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower and so on.

1, the use of two-way stem stem-free connection, simple and compact structure, easy maintenance and disassembly (can be disassembled); disc with automatic centering function (up and down, left and right), to achieve the disc and seat small The amount of cooperation.

2, tongue trough seat, to ensure that the valve body, seat, disc plate between the exact connection, and can easily replace the seat.

3, the use of the world's advanced spherical seal, sealed more reliable. Because it is a spherical seal, the valve is open and closed when the smooth, so reduce the friction, reducing the torque, you can use low-power drive device, thereby reducing the cost of the user. While improving the service life of the valve seat (3-4 times the normal midline valve).

4, seat flange sealing surface with large wide edge, large arc structure, so that the valve can be adapted to the jacket or welded flange connection requirements, suitable for connection with any standard flange.

5, stem axial positioning device, using two gasket plus a pair of open ring and spring ring structure. This can also effectively prevent the stem inadvertently be disassembled, while also carrying a certain axial force, to prevent the weight of the stem to the butterfly plate.

6, stem seal from the two-way seal, that is, to prevent foreign material intrusion, while preventing the media outflow.

7, the sleeve from both the role of supporting the stem, while reducing the opening and closing torque. There are two sets of bushings available for users to choose, namely: lubricated bronze, polytetrafluoroethylene.

8, because the valve itself to replace the common seat back, an increase of the overall strength of the valve, so that it can achieve the ordinary midline butterfly valve can not achieve the nominal pressure of 20 kg.