原文：
生产的系列碟阀的密封结构形式有：单偏心密封、双偏心密封、三偏心密封、变偏心密封，各种结构类型碟阀的密封原理简述如下： 1、单偏心密封碟阀的密封原理 2、双偏心密封蝶阀的密封原理 由于在单偏心蝶阀的基础上将蝶板的回转中心(既阀门轴中心)与阀体中心线形成尺寸b偏置，使得蝶阀在开启过程中，蝶板的密封面会比单偏心密封蝶阀更快地脱离阀座密封面，蝶板转动至8°～12°时，蝶板密封面xx脱离阀座密封，xx开启时，两密封面之间形成一个更大的间隙y，该类蝶阀的设计，大大降低了两密封面之间的机械磨损及拥挤压变形，使蝶阀的密封性能更为提高。 3、三偏心密封蝶阀的密封原理 由于在双偏心蝶阀的基础上将阀座中心线再与阀体中心线形成一个β角偏置，使得蝶阀在启阀过程中，蝶板的密封面在开启瞬间立即脱离阀座密封面，而在关闭瞬间才会接触并压紧阀座密封面。当xx开启时，两密封面之间形成一个与双偏心密封蝶阀相同的间隙y，该类蝶阀的设计，xxxx了两密封面之间的机械磨损和擦伤，使蝶阀的密封性能和使用寿命都得到大大提高。 4、变偏心密封蝶阀的密封原理 变偏心蝶阀的独特之处在于安装蝶板的阀杆轴是一个三段轴式结构，此三段轴式阀杆两段轴段同心，而中心段轴中心线与两端轴线偏离一个中心距，蝶板就安装在中间轴段上。这样的偏心结构使得蝶板在全开位置时成为双偏心状，而在蝶板转动到关闭位置时则成为单偏心状。由于偏心轴的作用，在接近关闭时，蝶板向阀座的密封锥面内移进一个距离，蝶板与阀座的密封的密封面相吻合达到可靠的密封性能。 由于蝶板的回转中心(即阀门轴中心)与蝶板密封截面按a偏心设置，使得蝶阀在开启过程中，蝶板密封面逐渐脱离阀座密封面，蝶板转动至20°～25°时，蝶板密封面xx脱离阀座密封面，xx开启时，两密封面之间形成间隙x，从而使得蝶阀在启闭过程中，两密封面之间相对机械磨损及挤压大为降低，从而保证了蝶阀的密封。

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译文：
Produced a series of butterfly valve seal structure of the form: a single eccentric seal, double eccentric seal, three eccentric seal, variable eccentric seal, various structural types of butterfly valve sealing principle summarized as follows: 1, single eccentric butterfly valve seal sealing principle 2, double eccentric butterfly valve seal sealing principle As the basis of a single eccentric butterfly valve will be the rotary center of the disc (both valve shaft center) and the body size of b-bias central line, making the process valve is opened, the disc sealing surface sealing than a single eccentric Butterfly more quickly from the seat sealing surface, the disc rotation to 8 ° ~ 12 ° when the disc from the valve seat sealing surface completely sealed, fully open, the two sealing surface of a larger gap between the y, the type butterfly valve design, significantly reduces both mechanical wear between the sealing surface and the congestion pressure distortion, so that even more to improve the sealing performance butterfly valve. 3, the three eccentric butterfly valve seal sealing principle As the basis of the double eccentric butterfly valve and the valve will seat the center line of the center line and then form a β angle of bias, making the process of butterfly valves in the Kai, the sealing surface of the disc immediately in the opening moments from the valve seat sealing surface , and in the closing moments will contact and compress the valve seat sealing surface. When fully opened, between the two sealing surface to form a seal with the double eccentric butterfly valve clearance the same y, kind of butterfly valve design, the complete elimination of the sealing surface between two mechanical wear and abrasion, so that the sealing butterfly valve performance and service life have been greatly enhanced. 4, variable eccentric butterflyvalve seal sealing principle Variable eccentric butterfly valve is unique in that the valve stem axis installation disc is a three-axis structure, the three sections of the stem shaft two concentric shafts, while the center section of the center line and both ends of the axis of a center axis deviation distance, the installation disc in the middle section of the shaft. This eccentric structure makes the disc in the fully open position, like a double bias, while the disc rotation to the closed position, became the single eccentric shape. As the role of eccentric shaft, near the close, the butterfly plate sealed to the seat by moving a distance within the cone, sealing the disc with the valve seat sealing face to achieve a reliable sealing performance agreement. As the rotary center of the disc (ie the valve shaft center) and disc sealing section according to a bias setting, make butterfly valve in the open process, the disc sealing surface gradually from the valve seat sealing surface, the disc rotation to 20 ° ~ 25 °, the disc sealing surface completely out of the valve seat sealing surface, fully opened, the two gaps between the sealing surface of x, which makes the valve in the opening and closing process, both the relative mechanical wear between the sealing surface and squeeze much reduced, thus ensuring the sealing butterfly valve.