Stainless steel hard seal butterfly valve adopts precise J-shaped elastic seal ring and three eccentric multi-level metal hard seal structure. It is widely used in metal treatment, electric power, petrochemical industry, water supply and drainage, municipal construction and other industrial pipelines with medium temperature ≤ 425 ℃, as a flow regulator and flow carrier. It adopts three eccentric structure, and the sealing surface of valve seat and disc plate are made of stainless steel with different hardness, which has good corrosion resistance and long service life. This valve has two-way sealing function, and the product meets the national valve pressure test standard.

不銹鋼硬密封蝶閥為偏心金屬密封結(jié)構(gòu)，密封形式為金屬對金屬密封，可調(diào)換金屬密封圈對金屬密封，不銹鋼板與石墨復合板密封圈對金屬密封。驅(qū)動形式除了電動之外還有:手動，蝸輪桿傳動，氣動等。

The stainless steel hard seal butterfly valve is an eccentric metal seal structure, and the seal form is metal to metal seal. The replaceable metal seal ring is metal seal, and the stainless steel plate and graphite composite plate seal ring are metal seal. Besides electric drive, there are also manual drive, worm gear rod drive, pneumatic drive, etc.

下面讓我們來了解一下在使用不銹鋼硬密封蝶閥過程中可能出現(xiàn)的問題有哪些吧。

Now let's learn about the possible problems in the use of stainless steel hard seal butterfly valves.

一、由于多層軟硬疊式密封圈固定在閥板上，當閥板常開狀態(tài)時介質(zhì)對其密封面形成正面沖刷，金屬片夾層中的軟密封帶受沖刷后，直接影響密封性能。

1、 Since the multi-layer soft and hard laminated seal 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 is washed, which directly affects the sealing performance.

二、受結(jié)構(gòu)條件的限制該結(jié)構(gòu)不適應做通徑DN200以下閥門，原因是閥板整體結(jié)構(gòu)太厚，流阻大。

2、 Limited by the structural conditions, this 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、因三偏心結(jié)構(gòu)的原理，閥板的密封面與閥座之間的密封是靠傳動裝置的力矩使閥板壓向閥座。正流狀態(tài)時，介質(zhì)壓力越高密封擠壓越緊。當流道介質(zhì)逆流時隨著介質(zhì)壓力的增大閥板與閥座之間的單位正壓力小于介質(zhì)壓強時，密封開始泄漏。

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

其特征在于:所述閥座密封圈由軟性T形密封環(huán)兩側(cè)多層不銹鋼片組成。

The utility model is characterized in that the valve seat sealing ring is composed of multiple stainless steel sheets on both sides of a soft T-shaped sealing ring.

閥板與閥座的密封面為斜圓錐結(jié)構(gòu)，在閥板斜圓錐表面堆焊耐溫、耐蝕合金材料;固定在調(diào)節(jié)環(huán)壓板之間的彈簧與壓板上調(diào)節(jié)螺栓裝配一起的結(jié)構(gòu)。

The sealing surface of the valve plate and the valve seat is an inclined conical structure, and the inclined conical surface of the valve plate is overlaid with temperature resistant and corrosion-resistant alloy materials; The spring fixed between the pressing plates of the adjusting ring is assembled with the adjusting bolt on the pressing plate.

這種結(jié)構(gòu)有效地補償了軸套與閥體之間的公差帶及閥桿在介質(zhì)壓力下的彈性變形，解決了閥門在雙向互換的介質(zhì)輸送過程中存在的密封問題。

This structure effectively compensates the tolerance zone between the shaft sleeve and the valve body and the elastic deformation of the valve stem under the medium pressure, and solves the sealing problem of the valve in the process of two-way interchangeable medium transmission.

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The above is a detailed introduction about Shandong Sales Office of Shanghai Lianggong valve. I hope it will help you If you have any questions, please contact us We will provide you with professional service http://258kmw.com