Views: 255 Author: Site Editor Publish Time: 2021-10-25 Origin: Site
Butterfly valve is a kind of valve which can open, close, and regulate the fluid channel through the reciprocating rotation of disc type opening and closing parts about 90 degrees. Double flanged butterfly valve is not only simple in structure, small in volume, light in weight, low in material consumption and small in installation size, but also has good flow control function and sealing characteristics, which is one of the fastest developing valve varieties in recent ten years. Especially in the United States, Japan, Germany, France, Italy, and other industrial developed countries, wafer style butterfly valve is widely used, whose variety and quantity are still expanding.
The original triple eccentric butterfly valve is a kind of simple flapper valve with loose closure, which is usually used as flow control valve and damping valve in water pipeline system.
With the application of chemical resistant synthetic rubber in grooved butterfly valve, the performance is improved. As the synthetic rubber has the characteristics of corrosion resistance, erosion resistance, stable size, and low cost, you can choose different performance synthetic rubber according to different requirements to meet the working conditions.
Polytetrafluoroethylene (PTFE) can improve its comprehensive performance by filling and adding appropriate materials, so as to obtain butterfly valve sealing materials with better strength and lower friction coefficient, which overcomes some limitations of synthetic rubber. Therefore, polymer materials represented by polytetrafluoroethylene have been widely used in electric butterfly valve.
In order to meet the requirements of industrial applications such as high and low temperature, strong erosion, and long service life, metal seal manual butterfly valve has been greatly developed in recent ten years.
The application of computer aided design (CAD), computer aided manufacturing (CAM), and flexible manufacturing system (FMS) in valve industry makes the design and manufacturing of concentric butterfly valve reach a new level. They not only completely renovate the valve design calculation method and reduce the heavy repetitive routine design work of professional and technical personnel, but also make technical personnel have more energy to improve the technical performance of products.
There are many kinds of fisher butterfly valves and classification methods.
l Center seal butterfly valve
l Single eccentric sealing butterfly valve
l Double eccentric sealing butterfly valve
l Triple eccentric sealing butterfly valve
l Soft seal butterfly valve
l Metal hard seal butterfly valve
l Forced seal butterfly valve
l Pressure sealing butterfly valve
l Automatic sealing butterfly valve
l Vacuum butterfly valve. Electric actuated butterfly valve with working pressure lower than standard atmospheric pressure.
l Low pressure butterfly valve. Butterfly valve with nominal pressure PN ≤ 1.6Mpa.
l Medium pressure butterfly valve. Butterfly valve with nominal pressure PN =2.5-6.4Mpa.
l High pressure butterfly valve. Butterfly valve with nominal pressure PN = 10.0-80.0Mpa.
l Ultra-high-pressure butterfly valve. Butterfly valve with nominal pressure PN > 100MPa.
The rotation angle of butterfly ball valve from full open to full close is usually less than 90 degrees and itself does not have strong self-locking, so the manufacturer needs to install worm gear reducer on the valve stem. Using worm gear reducer can not only make the butterfly plate have self-locking ability and stop at any position, but also improve the operation performance of the valve.
The features of industrial gas butterfly valve include high temperature resistance, high pressure range, large nominal diameter, rubber body, and rubber ring. Large high temperature butterfly valve is welded with steel plate, which is mainly used for high temperature medium flue and gas pipeline.
