What are the structure and classification of eccentric butterfly valve

       Structural classification

     Single eccentric butterfly valve: to squeeze, address concentric butterfly valve and valve seat of the resulting in a single eccentric butterfly valve, the structural characteristics of the stem axisdeviated from the center of the disc, so that the disc is no longer a rotary axis, dispersion, reduce the excessive squeezingbutterfly valve seat board with the bottom.

    Double eccentric butterfly valve: double eccentric butterfly valve is the most widely further improvement of molding in single eccentric valve on the basis of the present application is. Itsstructural characteristics both in the stem axis deviation from the center of the disc, but also deviate from the body center. The effect of the double eccentric valve can be opened immediately after the disc from the valve seat, substantially eliminating the butterfly plate and valve seat unnecessary over extrusion,scratching phenomenon, reduce the resistance from the open,reducing the wear, improve seat life.

UD Series Variator

      Three eccentric butterfly valve: high temperature, you must use the seal, but the leak volume; to zero leakage, you must use the soft seal, but not high temperatures. In order to overcome this contradiction double eccentric butterfly valve, and a valve on the third eccentric. The so-called third eccentric, is not a positive sealing cone shape, but the oblique cone.

      Variable eccentric butterfly valve: variable eccentric butterfly valveis unique in that the valve stem axis installation disc is a threesection of shaft type structure, the three sections of the stem shaft two concentric shafts, while the center section of the shaftcenter line and both ends of the axis of a center axis deviationdistance, the installation disc in the middle section of the shaft.This structure makes the eccentric butterfly plate become doubleeccentric shape in the fully open position, the disc rotation to the closed position when a single eccentric shape. 

      The role of the eccentric shaft, near the close, the butterfly plate to the valve seat sealing moving a distance within the cone, the butterfly plate andvalve seat sealing face to achieve a reliable sealing performance agreement.

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