形橡胶圈密封属于自紧密封，使用压力范围广从1。
Rubber O-ring sealing is a kind of self-sealing, which can be applied under 1.
高压自紧密封水加热器是用于小氮肥厂合成系统余热回收的一种新型设备。
The water heater with self-tight sealing under high pressure is a new type of equipment used for waste heat recovery from the synthesis system in the small nitrogenous fertilizer plants.
综观国内外各类文献资料，很难查到平垫自紧密封结构应用于换热器管板密封的工程实例。
It is difficult to find out an engineering example that plain cushion self-tight seal applied to tubesheet seal in domestic and overseas references.
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