Traditional butterfly valve products have some disadvantages, such as not being able to be used in high temperature and high pressure environments, and poor sealing performance. The triple eccentric butterfly valve means that three eccentricities are made on the structure of the butterfly valve. This design process makes the triple eccentric butterfly valve make up for the shortcomings of the traditional butterfly valve and has a wider application field. It not only has the same good sealing performance as the soft sealing butterfly valve. , At the same time, it has the characteristics of high temperature and high pressure resistance of hard sealing butterfly valve. These are all thanks to the unique structure of the triple eccentric butterfly valve. In this article, Marvel Valve will tell you a detailed diagram of the structure of the triple eccentric butterfly valve.
The three eccentricities of the triple eccentric butterfly valve refer to:
1st Eccentric: The valve shaft is located behind the valve plate shaft, allowing the seal to tightly encircle the entire valve seat.
The second eccentricity: the centerline of the valve shaft is offset from the centerline of the pipe and valve, which is free from the interference of valve opening and closing.
3rd eccentricity: The valve seat cone shaft is offset from the centerline of the valve shaft, which eliminates friction during closing and opening and achieves a uniform compression seal around the entire valve seat.
The traditional butterfly valve adopts the position seal, and the appearance of the triple eccentric butterfly valve has changed the sealing structure of the traditional butterfly valve, and the position seal has become a torsion seal. A simple explanation is that the triple eccentric butterfly valve no longer relies on the elastic deformation of the valve seat to achieve sealing, but relies on the contact surface pressure between the sealing surface of the butterfly plate and the valve seat to achieve sealing.
In this way, the triple eccentric structure of the triple eccentric butterfly valve not only solves the problem of large leakage of the metal valve seat, but also has strong high pressure and high temperature resistance because the contact surface pressure is proportional to the medium pressure.
So where is the triple eccentric butterfly valve suitable for use? What kind of working conditions are generally suitable for installing triple eccentric butterfly valves?
The unique performance of triple eccentric butterfly valve makes it widely used in oil transportation pipeline cutting, metallurgical steel plant, gas main pipeline adjustment and cutting, chemical refining equipment medium adjustment cutting, water treatment equipment inlet and outlet water adjustment and cutting, thermal power station cooling Water system, natural gas, lye, seawater, acid and other industries.
In addition, the triple eccentric butterfly valve is more suitable for large-diameter valves, and can also be made into soft seals or hard seals according to customer needs.