The double eccentric butterfly valve has become the most widely used valve in various industries due to its structural features and improved functionality. Unlike the single eccentric butterfly valve, the double eccentric butterfly valve has an axis of the valve stem that is deviated from the center of the disc and the center of the body. This double eccentric effect allows the disc to quickly separate from the valve seat after the valve is opened, reducing unnecessary excessive extrusion and scratching between the disc and the valve seat. This, in turn, reduces opening resistance, wear, and improves the valve seat life.
One of the main advantages of the double eccentric butterfly valve is its ability to greatly reduce scratching, making it suitable for use with a metal valve seat in high-temperature fields. This improvement has expanded the application of butterfly valves, especially in industries that require valves to withstand high temperatures and pressure.
However, the sealing principle of the double eccentric butterfly valve is a positional sealing structure, with the sealing surface of the disc and the valve seat in line contact. This means that the elastic deformation caused by the disc squeezing the valve seat produces a sealing effect. As a result, the valve has strict requirements for closing position and pressure bearing capacity, which has led to a traditional belief that butterfly valves are not resistant to high pressure and can result in large leakage.
Despite these challenges, advancements in technology and manufacturing processes have allowed for the development of double eccentric butterfly valves that can meet the high-pressure requirements of various industries. These valves are designed to provide a reliable and efficient solution for applications where high pressure and tight sealing are essential.
Furthermore, advancements in material science and engineering have resulted in the production of double eccentric butterfly valves that are more durable and can withstand the demands of high-pressure environments. This has made them an attractive choice for industries such as oil and gas, chemical processing, and power generation.
In summary, while the double eccentric butterfly valve has historically faced challenges in terms of high-pressure resistance and potential leakage, technological advancements have led to significant improvements in its design and functionality. As a result, it has become the most widely used valve in a variety of industries, providing a reliable and efficient solution for applications requiring tight sealing and high-pressure resistance.
Post time: Feb-02-2024