Flanged Butterfly Valve Type
Nov 20, 2017
Flange butterfly valve is one of the most commonly used valve types in industrial valves, especially for low pressure and large diameter applications. The butterfly plate of the butterfly valve is installed in the diametrical direction of the pipe. In the flange butterfly valve body cylindrical channel, disc-shaped butterfly plate around the axis of rotation, rotation angle of 0 ° ~ 90 ° between, rotated to 90 °, the valve was fully open state.
Flange butterfly valve structure is simple, small size, light weight, only by a few parts. And only need to rotate 90 ° can quickly open and close, simple operation, while the valve has a good fluid control characteristics. In the fully open position, the thickness of the disc is the only resistance when the medium flows through the valve body, so the pressure drop produced by the valve is very small, so it has better flow control characteristics. Flange butterfly valve with a sealed seal and metal seal two sealed type. Elastic seal valves, seals can be embedded in the valve body or attached to the butterfly plate around.
The use of metal-sealed valves generally has a longer life than elastically sealed valves, but it is difficult to achieve complete sealing. Metal seals can be adapted to higher operating temperatures, and elastomeric seals have a temperature-limited defect. If the flange butterfly valve is required for flow control use, the main thing is to properly select the valve size and type. Flange butterfly valve structure is particularly suitable for the production of large diameter valves. Flange butterfly valve not only in the oil, gas, chemicals, water treatment and other general industry is widely used, but also used in thermal power plant cooling water system.
Commonly used on the folder-type flange butterfly valve and flange flange butterfly valve two. The double-headed bolt connects the valve between the two pipe flanges, the flange flange valve is the valve with a flange, the bolt on both ends of the valve flange connected to the pipe flange on. The strength of the valve performance refers to the valve to withstand the pressure of the media capacity. The valve is a mechanical product that is subjected to internal pressure and must therefore have sufficient strength and rigidity to ensure long-term use without cracking or deformation.
Valve main market development
Oil and gas industry
In North America and some developed countries, there are many proposed projects, the expansion of oil projects, in addition, because people pay more and more attention to environmental protection, the state established environmental regulations, so many years ago to establish the refinery must be re-transformation, so in the next few Year, investment in oil development and refining funds will continue to maintain growth momentum. China's long-distance pipeline of oil and natural gas pipeline construction and the future construction of long-distance pipeline in Russia will directly promote the growth of the oil industry valve market.