Longevity secret of high sealing bidirectional hard sealing butterfly valve

蝶阀，沟槽蝶阀目前，蝶阀作为一种用来实现管路系统通断及流量控制的部件，已在石油、化工、冶金、水电等许多领域中非常广泛地应用。在已公知的蝶阀技术中，其密封形式多采用密封结构，密封材料为橡胶、聚四等。由于结构特征的限制，不适应、高压及、抗磨损等行业。现有一种比较的蝶阀是三偏心金属硬密封蝶阀，阀体和阀座为连体构件，阀座密封表面层堆焊耐温、耐蚀合金材料。多层软叠式密封圈固定在阀板上，这种蝶阀与传统蝶阀相比具有，操作轻便，启闭无磨擦，关闭时随着传动机构的力矩加大来补偿密封，消防沟槽蝶阀，提高了蝶阀的密封性能及延长使用寿命的优点。但是，这种蝶阀在使用过程中仍然存在以下问题：

Butterfly valve, grooved butterfly valve at present, as a component used to realize the on-off and flow control of pipeline system, butterfly valve has been widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower and so on. In the well-known butterfly valve technology, its sealing form mostly adopts sealing structure, and the sealing materials are rubber, POLY-4, etc. Due to the limitation of structural characteristics, it is not suitable for, high pressure and anti-wear industries. The existing butterfly valve is a three eccentric metal hard sealing butterfly valve. The valve body and valve seat are connected components, and the sealing surface of the valve seat is overlaid with temperature resistant and corrosion-resistant alloy materials. The multi-layer soft laminated sealing ring is fixed on the valve plate. Compared with the traditional butterfly valve, this butterfly valve has the advantages of light operation, no friction in opening and closing, compensation for sealing with the increase of the torque of the transmission mechanism when closing, and fire-fighting groove butterfly valve, which improves the sealing performance and prolongs the service life of the butterfly valve. However, the following problems still exist in the use of this butterfly valve:

一、由于多层软硬叠式密封圈固定在阀板上，当阀板常开状态时介质对其密封面形成正面冲刷，金属片夹层中的软密封带受冲刷后，直接影响密封性能。

1、 As the multi-layer soft and hard laminated sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium forms a positive scouring on its sealing surface, and the soft sealing belt in the metal sheet interlayer will directly affect the sealing performance after being scoured.

二、受结构条件的限制该结构不适应做通径DN200以下阀门，原因是阀板整体结构太厚，流阻大。

2、 Limited by structural conditions, the structure is not suitable for valves with a diameter below DN200, because the overall structure of the valve plate is too thick and the flow resistance is large.

三、因三偏心结构的原理，阀板的密封面与阀座之间的密封是靠传动装置的力矩使阀板压向阀座。正流状态时，介质压力越高密封挤压越紧。当流道介质逆流时随着介质压力的加大阀板与阀座之间的单位正压力小于介质压强时，密封开始泄漏。

3、 Due to the principle of three eccentric structure, the sealing between the sealing surface of the valve plate and the valve seat is pressed against the valve seat by the torque of the transmission device. In the normal flow state, the higher the medium pressure, the tighter the seal extrusion. When the medium in the flow channel flows backward, with the increase of medium pressure, when the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, the seal begins to leak.

高性能三偏心双向硬密封蝶阀，其特征在于：所述阀座密封圈由软性T形密封环两侧多层不锈钢片组成。阀板与阀座的密封面为斜圆锥结构，在阀板斜圆锥表面堆焊耐温、耐蚀合金材料;固定在调节环压板之间的弹簧与压板上调节螺栓装配一起的结构。这种结构地补偿了轴轴套与阀体之间的公差带及阀杆在介质压力下的弹性变形，了阀门在双向互换的介质输送过程中存在的密封问题。

The high-performance three eccentric two-way hard sealing butterfly valve is characterized in that the valve seat sealing ring is composed of multi-layer stainless steel sheets on both sides of the soft T-shaped sealing ring. The sealing surface of valve plate and valve seat is inclined conical structure, and the inclined conical surface of valve plate is overlaid with temperature resistant and corrosion-resistant alloy materials; The spring fixed between the adjusting ring pressing plate and the adjusting bolt on the pressing plate are assembled together. This structure compensates the tolerance zone between the shaft sleeve and the valve body and the elastic deformation of the valve stem under medium pressure, and solves the sealing problem of the valve in the process of two-way interchangeable medium transmission.

采用软性T型两侧多层不锈钢片组成密封圈，具有金属硬密封和软密封的双重优点，无论在低温和高温情况下，均具有零渗漏的密封性能

The soft T-shaped multi-layer stainless steel sheets on both sides are used to form the sealing ring, which has the dual advantages of metal hard seal and soft seal. It has zero leakage sealing performance under low and high temperature

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