?液壓件的密封性是指液壓元件和液壓管路之間的密封性，這種密封性主要是液壓件的密封性是否優良，對系統設計起到重要作用液壓傳動系統密封性好對液壓件可靠性工作有很大好處，保證了它具有良好的液壓傳動能力密封性良好會影響液壓傳動系統的工作效率及液壓系統的穩定運行，因此對系統設計有重要作用。
對于液壓系統密封性良好的液壓傳動系統而言，其密封性可分為兩個方面：一是系統設計過程中要充分考慮油路系統漏油的可能性，以保證系統的穩定運行，防止系統在動作過程中發生泄漏；二是系統中液壓元件及管路要保證工作壓力和流量不受外部環境影響，并保持適當的運動速度和運動位置，以滿足系統工作要求。
在液壓系統設計過程中應重視泄漏分析問題，確定液壓元件工作阻力大小和元件之間傳遞熱量和磨損等故障的具體位置，并充分考慮與外部環境相互影響所產生的影響及其由此造成后果密封性良好對系統起到重要作用由于油路中流動介質含有水分、雜質和顆粒，容易造成泄漏或堵塞；在管路安裝時要注意防止管道振動和震動。
液壓缸、閥體和油缸等零件之間都會磨損，所以選擇耐磨性好的零件非常重要在選擇時，應特別注意以下幾個方面：a)具有良好的耐磨性，避免因磨粒磨損而損壞零件，污染液壓油，從而降低液壓系統的工作效率；b)表面應有良好的涂層，以免粘附在零件表面形成氧化膜，降低其使用壽命；c)零件表面應具有良好的機械強度，以保證零件之間的可靠接觸；d)良好的耐磨性是材料選擇和加工工藝的關鍵，材料選擇和加工工藝的關鍵環節之一是耐磨性和強度的選擇；e)在正確選擇零件時，盡量使用具有耐磨性和優異耐腐蝕性的材料。
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