升降货梯的使用与密封圈的选择有很大的关系，劣质的密封圈使用寿命比较短，一旦出现损坏会导致液压油缸出现漏油的现象。液压油缸一旦出现漏油现象就会导致液压升降货梯升降速度变得缓慢，严重时会导致其无法正常运行。所以我们在选择该配件时要严格保证其质量，以最大限度的减少故障的发生。那么有哪些因素影响密封圈的性能呢？
第一温度。对一种密封件材料的最高使用温度和最低使用温度进行描述是比较困难的，液压升降货梯因为这是一系列因素综合影响的结果。对于活塞和活塞杆的工作温度都不同，要对它们进行区别选择。
A seal material on the maximum temperature and the minimum temperature is difficult to describe, hydraulic lift freight elevator because it is the result of the combined effects of a number of factors. The piston rod and the operating temperature is different, the difference between them to choose.　　
第二压力。压力的高低，移动式升降机压力循环周期变化的长短，对密封件损坏（如挤出）有很大的影响。压力越高，其它的因素对密封件的性能影响越大，如温度，速度，密封件的材料，活塞和缸筒之间的间隙，活塞和缸头之间的间隙。
High and low pressure, pressure cycling mobile lift cycle length, has a great influence on the damage to the seals (such as extrusion). The higher the pressure, the greater the influence of other factors on the performance of the seal member, the gap clearance, such as temperature, velocity, material of the sealing member, the piston and the cylinder between the piston and the cylinder head.
第三表面处理经验表明，液压升降机油缸活塞和活塞杆表面的特性对密封件的寿命有着非常大的影响。表面特性常用表面粗糙度Ra的值来定义，Ra是表面形状偏离中心线绝对值的算术平均值。但些数值并不能完全表示表面情况对密封件的影响，这是因为即使在同样的粗糙度下，不同的表面形状特征可以导致对密封件不同程度的密封件磨损。
Characteristics of the hydraulic lift cylinder piston and piston rod surface has a very big impact on the life of the seal. Common characteristics of the surface roughness Ra value of the surface is defined, Ra is the arithmetic average deviation from the center line of the surface shape of the absolute value. However, these values can not completely affect the surface condition of said seal, which is because even under the same roughness, the surface shape of the different features may lead to different levels of the sealing member seals wear.
第四是摩擦力。密封件和密封表面的摩擦力取决于很多因素：表面粗糙度，表面的特性，压力，介质，温度，密封件的材料，密封件的型式和运动速度。
Friction seals and the sealing surface depends on many factors: the type and velocity of the surface roughness properties of the surface pressure, the materials, the temperature, the sealing member, the sealing member.

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