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如何选购金属缠绕垫片

2014/3/19 13:29:46点击:

    金属缠绕垫片是一种重要的密封元件,被广泛地应用石油、化工、冶金、发电、船舶等行业,是当前我国压力管道、阀门、泵、换热器等设备静密封的关键零部件。所以选择和使用优质的金属缠绕垫片产品,对减少和杜绝跑、冒、滴、漏,保证主机设备安全、压力管道正常地运行,具有十分重要的意义。

       Metal winding gasket is a sealing element is important, is widely used in petroleum, chemical,metallurgy, electric power, shipbuilding and other industries, is the current Chinese pressure piping, valves, pumps, heat exchangers and other equipment for static sealing parts. So theselection and use of high-quality metal winding gasket products, to reduce and eliminate run,take, drop, leakage, ensure the safety of pressure pipelines, mainframe equipment in normal operation, has the very vital significance.

  一、选购金属缠绕垫片产品时应注意以下几点:

      A, choose metal spiral wound gasket products should pay attention to the following points:

  1、根据工况条件、法兰密封面型式选择垫片。

       1, according to the selection of gasket sealing surface conditions, flange.

  2、金属缠绕垫片主体表面不允许有影响密封性能的伤痕、空隙、凹凸不平及锈斑缺陷。金属缠绕垫片垫片主体表面非金属带应均匀、适当的高出金属带,层间纹理应清晰,但不可显露金属带。金属缠绕垫片的焊点间距应均匀,不应有未熔合或过熔等缺陷。加强环表面不应有毛刺、凹凸不平、锈斑等缺陷,金属缠绕垫片垫片主体的上下密封面与加强环上下表面的间距应相等内加强环与垫片主体间应紧密固定,不能松动;外加强环与垫片主体间应保持定位并可适当松动。

      2, metal winding gasket body surface are not allowed to have scars, voids, rugged and rustdefects affect the sealing performance. Metal gasket. The surface of the body of non metal beltshould be uniform, moderate to high metal band, interlayer texture should be clear, but notexposed metal belt. Metal spiral wound gasket spot spacing should be uniform, there should be no lack of fusion or welding defects. Reinforcing ring surface should not have burrs, rough, rust and other defects, metal gasket. The main body of the sealing surface and the reinforcement ring on the lower surface spacing should be equal to strengthen ring and gasket between the main body should be tightly fixed, not loose; with stiffening ring and gasket between the main body should keep proper positioning and loose.

  3、金属缠绕垫片压缩率、回弹率和密封性能是密封垫片的重要性能指标,一般来说,在满足压缩率要求的前提下,回弹率越高越好;而在满足回弹率标准要求的前提下,压缩率的测试值也是大些为好。金属缠绕垫片应选择密封性能好、压缩率适度且回弹率尽可能大的产品。

       3, metal winding gasket compression ratio, and the sealing performance is an importantperformance index, the gasket in general, the compression ratio of the requirements of the premise, the rebound rate is higher; and in order to meet the standard requirements of therebound rate, compression ratio of the test value is bigger is better. Gasket should choose good sealing performance, compression rate is modest and resilience rate is as large as possibleproducts metal winding.

  二、安装金属缠绕垫片时应注意以下几点:

       Two, the installation of metal spiral wound gasket should pay attention to the following points:

  1、安装前仔细检查法兰、螺栓、螺母及垫片的质量,仔细检查法兰或接口安装情况,有无偏口、错口、张口、错孔等缺陷。

       1, before installation, carefully check the quality flange, bolts, nuts and gaskets, carefully check the flange or interface installation, defect is unbiased mouth, mouth, mouth, wrong wrong hole.

  2、法兰或密封部位表面必须清理干净,垫片表面及螺栓、螺纹上不允许粘附机械杂质。

       2, the flange or the sealing surfaces must be clean, mechanical adhesion of impurities does not allow gasket surface and bolt, screw thread.

  3、金属缠绕垫片不能装偏,应保证受压均匀。

       3, metal winding gasket can not be installed offset, should guarantee the uniform compression.

4、旋紧螺母时应用力均匀,螺栓要对称地均匀地分23次旋紧,使金属缠绕垫片垫片受压均匀。

4, tighten the nut force should be uniform, bolts to be symmetric and evenly divided into 2 to 3 times the tightened, so that the metal gasket. Uniform compression.