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弹簧性能的发生变化将会直接影响机械密封端面比压。
Changes in the spring performance will directly affect the mechanical seal face pressure.
球体和阀座密封圈都采用金属材料制造，密封比压很大，依靠介质本身的压力已达不到密封的要求，必须施加外力。
Ball and valve seat rings are metal materials, sealing pressure than the large, rely on the media itself can not seal the pressure has reached the requirements to be imposed by external forces.
本文根据液体在低温状态下，分子运动的特性，提出了低温密封液体的比压计算公式。
Based on the molecular motion characteristics of liquid in low temperature, the paper presents the equations for specific pressure for sealing liquid in low temperature.
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