液压件的密封性是指液压元件和液压管路之间的密封性，这种密封性主要是液压件的密封性是否优良，对系统设计起到重要作用液压传动系统密封性好对液压件可靠性工作有很大好处，保证了它具有良好的液压传动能力密封性良好会影响液压传动系统的工作效率及液压系统的稳定运行，因此对系统设计有重要作用。
对于液压系统密封性良好的液压传动系统而言，其密封性可分为两个方面：一是系统设计过程中要充分考虑油路系统漏油的可能性，以保证系统的稳定运行，防止系统在动作过程中发生泄漏；二是系统中液压元件及管路要保证工作压力和流量不受外部环境影响，并保持适当的运动速度和运动位置，以满足系统工作要求。
在液压系统设计过程中应重视泄漏分析问题，确定液压元件工作阻力大小和元件之间传递热量和磨损等故障的具体位置，并充分考虑与外部环境相互影响所产生的影响及其由此造成后果密封性良好对系统起到重要作用由于油路中流动介质含有水分、杂质和颗粒，容易造成泄漏或堵塞；在管路安装时要注意防止管道振动和震动。
液压缸、阀体和油缸等零件之间都会磨损，所以选择耐磨性好的零件非常重要在选择时，应特别注意以下几个方面：a)具有良好的耐磨性，避免因磨粒磨损而损坏零件，污染液压油，从而降低液压系统的工作效率；b)表面应有良好的涂层，以免粘附在零件表面形成氧化膜，降低其使用寿命；c)零件表面应具有良好的机械强度，以保证零件之间的可靠接触；d)良好的耐磨性是材料选择和加工工艺的关键，材料选择和加工工艺的关键环节之一是耐磨性和强度的选择；e)在正确选择零件时，尽量使用具有耐磨性和优异耐腐蚀性的材料。
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