Cold Extrusion Sleeves,Cold Shrink Sleeve,Cold Working Sleeves,Cold Extrusion Sleeves Aluminum Shandong Jianlong Steel Co. , https://www.jianlongmetal.com
Disc valve seal in accordance with the structure of the classification
Production of series disc valve seal structure are: single eccentric seal, double eccentric seal, three eccentric seal, eccentric seal, a variety of structural types of butterfly valve sealing principle is summarized as follows: 1, single eccentric seal butterfly valve sealing principle 2, double eccentric sealing butterfly valve sealing principle Because the single eccentric butterfly valve on the basis of the rotation center of the disc (both the valve shaft center) and body centerline size b offset, making the butterfly valve in the opening process, the butterfly plate Sealing surface will be faster than the single eccentric sealing butterfly valve seat sealing surface, disc rotation to 8 ° ~ 12 °, the butterfly valve sealing surface completely from the seat seal, fully open, the two sealing surfaces to form a larger Of the gap y, the design of this type of butterfly valve, greatly reducing the mechanical wear between the two sealing surfaces and squeeze deformation, so that the butterfly valve sealing performance is more improved. 3, three eccentric sealing butterfly valve sealing principle Because of the double eccentricity butterfly valve on the basis of the valve seat center line with the valve body centerline to form a β angle offset, making the butterfly valve in the valve opening process, the sealing surface of the butterfly valve is turned on Immediately from the valve seat sealing surface, and in the closing moment will contact and squeeze the seat sealing surface. When fully opened, the two sealing surfaces form a gap y between the two eccentric sealing butterfly valves. The design of such butterfly valves completely eliminates the mechanical wear and abrasion between the two sealing surfaces so that the butterfly valve sealing performance and use Life expectancy has been greatly improved. 4, the eccentric sealing butterfly valve sealing principle Variable eccentric butterfly valve is the uniqueness of the valve stem shaft is a three-stage shaft-mounted structure, the three shaft stem two concentric shaft section, and the central section of the shaft center Deviate from the axis of both ends of a line from the center distance, the disc is installed on the shaft section. This eccentric structure allows the disc to be double-eccentric in the fully open position and single eccentric when the disc rotates to the closed position. Due to the action of the eccentric shaft, when close to close, the butterfly plate moves a distance into the sealing conical surface of the valve seat, and the butterfly plate matches the sealing surface of the valve seat to achieve reliable sealing performance. As the center of rotation of the butterfly valve (ie, the center of the valve shaft) and the sealing section of the butterfly plate are set eccentrically, the butterfly valve sealing surface is gradually separated from the sealing surface of the valve seat during the opening process. When the butterfly plate rotates to 20 ° ~ 25 ° , The sealing surface of the disc is completely separated from the sealing surface of the valve seat. When the valve disc is fully opened, a gap x is formed between the two sealing surfaces so that the relative mechanical wear and squeeze between the two sealing surfaces are greatly reduced during the opening and closing process of the butterfly valve. Guarantee the butterfly valve seal.