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即使是最有经验的O形密封圈使用者,也往往只考虑诸如密封圈沟槽的大小、流体介质、温度范围以及工作压力这样一些常规的应用因素。他们很容易忽略摩擦力、耐磨性以及温度的变化或维护工作,认为这些因素对密封的选择并不重要。而事实上,忽略这些因素可能导致密封的过早失效。现以一台结构复杂、价格昂贵的汽车车架整直机为例。各液压元件的O形密封圈尺寸都正确,其材料又与液压油以及工作温度相适应,密封材料的硬度也足够。但是,在第一次预防性检修以后不到二个月,就因密封损坏而停机。
Even the most experienced O-ring users tend to consider only conventional applications such as ring groove size, fluid medium, temperature range, and working pressure. They easily overlook friction, wear resistance and temperature changes or maintenance work, and consider these factors not critical to the choice of seal. In fact, ignoring these factors can lead to premature seal failure. Take a complex and expensive car frame straightening machine as an example. The O-ring size of the hydraulic components are correct, and its material and hydraulic oil and operating temperature to adapt to the hardness of the sealing material is sufficient. However, less than two months after the first preventive maintenance, the seal was shut down due to damage.