a simple classification of cast steel stainless steel butterfly valve is introduced, concentric butterfly valves

structure characteristics of this kind of butterfly valve as the axis of the stem and disc base, ontology base on the same position. With simple structure and convenient. See more line with rubber butterfly Industrial Valves which belongs to and so on. Defect is due to the butterfly plate and valve seat has been in a state of kneading, scratches, is apart from the big, fast wear. To overcome the kneading, scratches, ensuring the sealing function, seat basically choose elastic material such as rubber or ptfe, but also by temperature and so on the use of constraints, which is why people traditionally butterfly valve is not resistant to high temperature.

2, single eccentric butterfly valves

to deal with concentric butterfly valve disc and seat of kneading, this happened eccentric butterfly valve and its structure characteristics for the axis of the stem has violated the butterfly plate base, so that the butterfly plate up and down side become no longer axis of inversion, scattered, reduced the butterfly plate up and down the excessive kneading and valve seat. But as a result of single eccentric structure adjustment in the process of the switch valve plate and Industrial Valves seat scratches scene did not see, on the use range and concentric butterfly valves are the same, so choose.

3, double eccentric butterfly valves

in single eccentric butterfly valve on the basis of further improve molding is now the most widely used double eccentric butterfly valve. Its structure characteristics to the axis of the stem is violating the butterfly plate base, can and ontology base. Double

the role of the eccentric butterfly plate can immediately after making the valves are open from the seat, greatly eliminates unnecessary excessive kneading disc and seat, scraping scene, reduced the open distance, decrease the wear resistance, raised a good seat. Scrape together, also makes a big drop in double eccentric butterfly valve also can choose metal seated, improve the use of the category of butterfly valves in high temperature. But as a result of its seal principle belongs to bearing seal structure, namely the butterfly plate and valve seat sealing surface the touch line, through the butterfly plate kneading seat sealing function formed by the elastic deformation occurs, so a high request to the closed position ( Especially the metal seated) , confined to low, which is why people traditionally butterfly valve is not resistant to high pressure, a large quantity of leakage factors.

four, three eccentric butterfly valves

to high temperature resistant, it is necessary to use hard seal, but the large amount of leakage; To zero leakage, it is necessary to use soft seal, but it is not resistant to high temperature. To overcome this opposition, double eccentric butterfly Industrial Valves and eccentric butterfly valve for the third time. The structure characteristics of the double eccentric axis of the stem bearing eccentric together, make the butterfly plate type sealing face of the cone axis deflection in ontology cylindrical axis, which is said to him, 'after the third eccentric, butterfly plate sealing section is no longer true circle, ellipse, its sealing surface shape and the asymmetry, side askew in ontology base line, the other side of the base line is parallel to the ontology.

the third eccentric the biggest characteristic that is fundamentally changing the way of sealing structure, is no longer bearing seal and seal but torsion, namely not rely on the elastic deformation of the seat, but the touch of completely rely on the seat surface pressure sealing function to achieve zero leakage, and thus every processing the metal seat.

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