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蝶阀的分类

Classification of butterfly valves

一、同心蝶阀

I. concentric butterfly valves

该种蝶阀的结构特征为阀杆轴心、蝶板中心、本体中心在同一位置上。结构简单、制造方便。常见的衬胶蝶阀即属于此类。

The structural features of the butterfly valve are the center of the stem, the center of the butterfly plate and the center of the body. The structure is simple and the manufacture is convenient. Common rubber lined butterfly valve belongs to this category.

缺点是由于蝶板与阀座始终处于挤压、刮擦状态，阻距大、磨损快。

The drawback is that the butterfly plate and valve seat are always in extrusion and scraping, with large resistance distance and fast wear.

二、单偏心蝶阀

Two. Single eccentric butterfly valve

为解决同心蝶阀的蝶板与阀座的挤压问题，由此产生了单偏心蝶阀。其结构特征为阀杆轴心偏离了蝶板中心，从而使蝶板上下端不再成为回转轴心，分散、减轻了蝶板上下端与阀座的过度挤压。

In order to solve the extrusion problem of butterfly plate and seat of concentric butterfly valve, a single eccentric butterfly valve is generated. The structure features that the shaft center of the valve stem deviates from the center of the butterfly plate, so that the upper and lower ends of the butterfly plate no longer become the center of rotation, dispersing and reducing the excessive extrusion of the upper and lower ends of the butterfly plate and the valve seat.

三、双偏心蝶阀

Three, double eccentric butterfly valve

在单偏心蝶阀的基础上进一步改良成型的就是目前应用最广泛的双偏心蝶阀。其结构特征为在阀杆轴心既偏离蝶板中心，也偏离本体中心。

On the basis of the single eccentric butterfly valve, the double eccentric butterfly valve is further improved. Its structural feature is that the axis of the stem deviates from the center of the butterfly plate and also deviates from the center of the body.

双偏心的效果使阀门被开启后蝶板能迅即脱离阀座，大幅度地消除了蝶板与阀座的不必要的过度挤压、刮擦现象，减轻了开启阻距，降低了磨损，提高了阀座寿命。

The effect of double eccentricity makes the butterfly plate detached from the valve seat immediately after the valve is opened, eliminating the unnecessary excessive extrusion and scraping between the butterfly plate and the valve seat, reducing the opening resistance, reducing the wear and tear, and increasing the life of the valve seat.

四、三偏心蝶阀

Four, three eccentric butterfly valves

要耐高温，必须使用硬密封，但泄漏量大；要零泄漏，必须使用软密封，却不耐高温。为克服双偏心蝶阀这一矛盾，又对蝶阀进行了第三次偏心(偏离金属密封面中心线)。

To withstand high temperature, must use hard seal, but the leakage is large; to zero leakage, must use soft seal, but not high temperature. In order to overcome the contradiction of double eccentricity butterfly valve, the third eccentricity of the butterfly valve (deviating from the center line of the metal seal surface) was carried out.

其结构特征为在双偏心的阀杆轴心位置偏心的同时，使蝶板密封面的圆锥型轴线偏斜于本体圆柱轴线。也就是说，经过第三次偏心后，蝶板的密封断面不再是真圆，而是椭圆。

The structure features that the conical axis of the sealing surface of the butterfly plate is deflected to the cylindrical axis of the body while the shaft center of the double eccentric valve stem is eccentric. That is to say, after third eccentricities, the sealing section of the butterfly plate is no longer a real circle, but an ellipse.

第三次偏心的最大特点就是从根本上改变了密封构造，不再是位置密封，而是扭力密封；不是依靠阀座的弹性变形，而是完全依靠阀座的接触面压来达到密封效果。

The greatest feature of the third eccentricity is that the seal structure is fundamentally changed, not the position seal, but the torsion seal; not rely on the elastic deformation of the seat, but rely entirely on the contact surface pressure of the seat to achieve sealing effect.

因此一举解决了金属阀座零泄漏这一难题，并因接触面压与介质压力是成正比的，耐高压高温也迎刃而解。

Therefore, the problem of zero leakage of metal valve seat is solved in one fell swoop, because the pressure of contact surface is proportional to the pressure of medium, and the resistance to high pressure and high temperature is also solved.