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静密封

(2009-04-14 07:52:42)
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杂谈

    1、非金属材料:如纸、麻、牛皮、石棉制品、塑料、橡胶等。
  纸、麻、牛皮之类,有毛细孔,易渗透,使用时须浸渍油、蜡或其他防渗透材料。一般阀门很少采用。
  石棉制品,又有石棉带、绳、板和石棉橡胶板等。其中石棉橡胶板结构致密,耐压性能好,耐温性能也很好,在阀门本身和阀门与管子的法兰连接中,使用极为广泛。
  塑料制品,有很好的耐腐蚀性能,使用也较普遍。品种有聚乙烯、聚丙烯、软聚氯乙烯、聚四氟乙烯、尼龙66、尼龙1010等。
橡胶制品,质地柔软,各种橡胶分别有一定耐酸、耐碱、耐油、耐海水的能力。品种有天然橡胶、丁苯橡胶、丁腈橡胶、氯丁橡胶、异丁橡胶、聚氨酯橡胶、氟橡胶等。
  2、金属材料:一般地说,金属材料强度高,耐温性能强。但铅并不这样,仅取它耐稀硫酸的特性。常用品种有黄铜、紫铜、铝、低碳钢、不锈钢、蒙乃尔合金、银、镍等。
  3、复合材料:例如金属包皮(内部石棉) 垫圈、组合波形垫圈、缠绕垫圈等。

1, non-metallic materials: such as paper, linen, leather, asbestos products, plastic, rubber and so on.
Paper, linen, leather like, with the pores, easy penetration, to be impregnated using oil, wax or other anti-permeability materials. Seldom used in general valve.
Asbestos products, and asbestos tape, rope, boards and panels, such as asbestos rubber. Asbestos rubber sheet in which the structure of dense, good pressure, good heat resistance, and valves in the valve itself and the pipe flange connection, the use of a wide range.
Plastic products, have a good corrosion resistance, the more common use. Varieties are polyethylene, polypropylene, soft PVC, PTFE, nylon 66, nylon, etc. 1010.
Rubber, soft texture, a variety of rubber, respectively, a certain acid, alkali, oil, water-resistant capabilities. Species are natural rubber, styrene-butadiene rubber, nitrile rubber, chloroprene rubber, isobutyl rubber, polyurethane rubber, fluorine rubber and so on.
2, metallic materials: generally, the metal material high strength, temperature performance. However, this lead is not only resistant to dilute sulfuric acid from the characteristics of it. Common varieties are brass, copper, aluminum, low carbon steel, stainless steel, monel alloy, silver and nickel.
3, composite materials: metals such as circumcision (internal asbestos) washer, combination waveform gaskets, washers and other entangled.

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