Adjustment of the pneumatic valve sealing class structure and performance

butterfly pneumatic valve is widely used in urban construction, petrochemical, metallurgy, electric power industries such as the medium to be the best device for truncation or adjust the flow in the pipeline. Adjusting the structure of the pneumatic valve itself is the most ideal pipe opening and closing parts, is the development direction of pipeline open-close part today.
in the first place is the soft sealing structure of the single eccentric butterfly pneumatic valve, pneumatic valve seat seal section or the butterfly plate thickness direction bisectrix and relative eccentric rotary center pneumatic valve stem, make adjustment in the process of the pneumatic valve in the open, the butterfly plate sealing surface gradually out of the pneumatic valve seat sealing surface. When moving to ~ ° butterfly plate, the butterfly plate seal face completely out of the pneumatic valve seat sealing surface, so as to make the adjustment in the process of the pneumatic valve in the open, between the sealing surface relative mechanical wear and extrusion greatly reduced, thus to improve control pneumatic valve sealing performance. This design mainly rely on between the butterfly plate and pneumatic seat during elastic deformation to ensure adjustment of pneumatic valve seal.
on the basis of single eccentric butterfly pneumatic valve, the disc rotation center and the center line of the pneumatic valve port relative offset, makes the adjustment in the process of the pneumatic valve in the open, forming CAM effect, so that the sealing surface than single eccentric structure of butterfly plate faster from pneumatic valve seat sealing surface. When moving to ° ~ ° when the butterfly plate, the butterfly plate seal face completely out of the pneumatic valve seat sealing surface. This kind of structure design, greatly reduces the relative mechanical wear between the two sealing surface and extrusion deformation, the sealing performance of the pneumatic valve adjustment are improved.
on the basis of the double eccentric butterfly pneumatic valve, pneumatic valve seat sealing surface to the center line and the center line of the pneumatic valve form an Angle of eccentric, the butterfly plate in the process of opening, the sealing surface of disc in open moment immediately from the pneumatic valve seat sealing surface, and in the closing moments will contact and pressure pneumatic valve seat sealing surface. This a unique combination of eccentric, make full use of the CAM effect, eliminate pneumatic valve opening and closing butterfly valve seal between the sealing surface of mechanical friction and abrasion, in addition to the wear and the possibility of a leak. Squeeze the seal for the torque seal, by adjusting and driving moment, realize its sealing pressure adjustment, the three eccentric structure seal butterfly pneumatic valve sealing performance and service life is greatly improved.