The paper introduces the performance and materials of common hydraulic seal for wall and roof materials equipment, and describes the hydraulic seal structure, the seal mechanism and the application attentions.%介绍了墙体屋面材料生产设备常用液压密封件的使用性能和材质,详细论述了液压密封件的结构形式、密封机理及其应用时应注意的问题。
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