将石棉密封函改为油脂密封函,经过四年的使用,获得了较好的效果,为有害气体阀门的轴封开创出新路。本文介绍油脂密封的原理、特点以及油脂密封函的结构和性能试验。 Asbestos sealing letter will be changed to grease sealing letter, after four years of use, get better results, create a new path for the harmful gas valve shaft seal. This article describes the principle of oil seals, features and structure of the oil seal letters and performance tests.