O形圈是保证高压蒸汽洗车机柱塞泵密封性的重要部件，O形密封圈是一种截面为圆形的橡胶圈，因其截面为O形，故称其为O形密封圈，是液压与气压传动系统中使用最广泛的一种。由于O形密封圈用的合成橡胶材料是属于粘弹性材料，所以初期设定的压紧量和回弹堵塞能力经长时间的使用，会产生永久变形而逐渐丧失，最终发生泄漏。因此，O形密封圈需定期进行更换，以免损坏高压蒸汽洗车机柱塞泵。O形圈是纯胶结构，因此要根据工作条件，特别是工作压力来选择O形圈的材料和硬度，对于中低压场合，当胶料硬度为90时，可耐压力150kg/cm2，当胶料硬度提高到95度时，不加挡圈耐压可达700kg/cm2，所以O形圈胶料的硬度对密封件耐压性能有极重要的影响。文英文版：

O ring is an important component for ensuring sealing plunger pump of high-pressure cleaner, O sealing ring is a circular

section rubber ring, because of its cross section is O, so the O ring, hydraulic and pneumatic transmission system is one

of the most widely used. The synthetic rubber O ring is a viscoelastic material, so the initial set of compression and

rebound clogging ability after using for a long time, will produce permanent deformation and gradually lost, eventually

leak. Therefore, the O shape sealing ring should be changed regularly, so as not to damage the plunger pump of high-

pressure cleaner. O ring is gum structure, so according to the working conditions, especially the work pressure to choose

the O ring material and hardness, for low voltage, when the rubber hardness is 90, high pressure 150kg/cm 2, when the

rubber material hardness of 95 degrees, without pressure up to 700kg /cm. 2, so the O ring rubber hardness has an important

influence on the seal resistance.

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