Double eccentric butterfly valve is also called high-performance butterfly valve. It is mainly used for drainage in water plants, power plants, steel mills, chemical industry, water source projects, environmental facilities construction and other systems. It is especially suitable for use as a regulating and intercepting device on waterway pipelines. Compared with the centerline butterfly valve, the double eccentric butterfly valve is more resistant to high pressure, has a longer life and good stability.
Zero leakage. Can be used in ultra-high vacuum conditions
To be resistant to high temperature, metal seals must be used, but the leakage is large; to be zero leakage, soft seals must be used, but they are not resistant to high temperature. In order to overcome this contradiction of the double eccentric butterfly valve, the butterfly valve was eccentric for the third time. The so-called third eccentricity means that the shape of the sealing pair is not a straight cone, but an oblique cone.
The uniqueness of the variable eccentric butterfly valve is that the valve stem shaft on which the butterfly plate is installed is a three-section shaft structure. The two shaft sections of this three-section shaft valve stem are concentric, and the center line of the center section shaft deviates from the axis of the two ends by a center distance. The butterfly plate is installed on the middle shaft section. This eccentric structure makes the butterfly plate double eccentric when it is in the fully open position, and single eccentric when the butterfly plate rotates to the closed position. Due to the effect of the eccentric shaft, when it is close to closing, the butterfly plate moves a distance into the sealing cone surface of the valve seat, and the sealing surface of the butterfly plate and the valve seat coincide to achieve reliable sealing performance.
Populárne Tagy: double eccentric butterfly valve class150 class300, China, manufacturers, suppliers, factory, buy, price, quotation
