液壓升降機現在普遍用于各行各業，屬于一種非常常見而且方便的機械設備。
Hydraulic lift is now widely used in various industries, is a very common and convenient machinery and equipment.
 
升降機主要特點是承重量大，彌補了一般電梯的缺點，受到了廣大用戶的青睞。而密封件又是液壓升降機中很重要的一個零件。密封件是防止流體或固體微粒從相鄰結合面間泄漏以及防止外界雜質如灰塵與水分等侵入機器設備內部的零部件的材料或零件。
Hangzhou lift the main characteristics of the load-bearing capacity, to make up for the shortcomings of the general elevator, the majority of users of all ages. The seal is a hydraulic lift in a very important part. Seal to prevent fluid or solid particles between the surface and to prevent leakage from the adjacent combined external impurities such as materials or parts, such as dust and water intrusion inside the machine equipment parts.
 
各種密封件其性能影響因素是不同的，如機械密封（填料密封等）影響因素有溫度、介質、磨損、所承受壓力等。
Factors which influence the performance of various sealing members are different, such as mechanical seals (packing etc.) factors are temperature, medium, wear, the pressures and the like.
 
按不同的用途，密封件大致是按下列的分類：
According to different uses, the sealing member substantially according to the following classification:
 
1.按作用分類：分為軸用密封、升降機孔用密封、防塵密封、導向環、固定密封、回轉密封；
1. role Category: divided shaft seal, lift hole sealed, dust-proof seals, guide rings, fixed seals, rotary seals;
 
2.按材料分類：分為橡膠、聚氨酯、工程塑料等。
2 By Material: into rubber, polyurethane, plastic and so on.
 
密封件雖小，但是它在液壓升降機中的起的最用很大。
Seals are small, but it plays in the hydraulic lift of the most used widely.