Soft Seal Structure and Performance in Butterfly Valves

Butterfly valve is widely used in urban construction, petrochemical, metallurgical, power and other industries on the pipeline to cut off or adjust the flow of the best device. The structure of the butterfly valve itself is the ideal opening and closing of the pipeline, is the development direction of today's pipeline opening and closing parts.

First, the single eccentric structure of the soft seal butterfly valve, valve seat sealing section or butterfly plate thickness direction of the bisector and the valve stem rotation center is relatively eccentric, making the butterfly valve in the opening process, the butterfly plate sealing surface gradually out of the valve seat sealing surface. When the butterfly plate is rotated to 20 to 25 °, the sealing surface of the butterfly plate is completely separated from the sealing surface of the valve seat, so that the relative mechanical wear and the pressing between the two sealing surfaces are greatly reduced during the opening of the butterfly valve, so that the sealing performance of the butterfly valve To be improved. This design depends on the butterfly plate and the valve seat between the extrusion elastic deformation to ensure that the butterfly valve seal.

On the basis of the single eccentric butterfly valve, the center of the butterfly plate is relatively biased with the center line of the valve runner, so that the butterfly valve is formed during the opening process so that the sealing surface of the butterfly plate is faster than the single eccentric structure Sealing surface. When the butterfly plate to 8 ° ~ 12 °, the butterfly plate sealing surface completely out of the valve seat sealing surface. The design of this structure, greatly reducing the relative mechanical wear between the two sealing surface and extrusion deformation, making the butterfly valve sealing performance is more improved.

On the basis of the double eccentric butterfly valve, the center line of the sealing surface of the valve seat and the center line of the valve form an angular eccentricity, so that the sealing surface of the butterfly plate is immediately separated from the sealing surface of the valve seat at the moment of opening Close the moment to contact and press the seat seal surface. This unique eccentric combination, the full use of the cam effect, the complete elimination of the valve opening and closing butterfly valve seal between the two sealing surface mechanical friction and abrasion, remove the possibility of wear and tear. Variable compression seal for the torque seal, by adjusting the external drive torque, to achieve its seal than the pressure adjustment, so that three eccentric seal seal valve sealing performance and service life has been greatly improved.

Tianjin Kaidesi Valve Manufacturing Co., Ltd. Main products: power plant desulfurization valve, all-butterfly valve, marine special butterfly valve, lacquered butterfly valve, lined butterfly valve, large diameter butterfly valve, hydraulic control valve, soft seal gate valve, check valve, Cut valves and so on. Tel: 13821219166

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