升降机厂家介绍说液压系统中所使用的液压油都是具有黏性，所以液压油在管路中不断地流动时会发生摩擦的情况，而不断地摩擦中必须要消耗掉克服摩擦力的能量，我们把这部分消耗的能量称之为压力损失。
Elevator manufacturers said hydraulic oil used in hydraulic systems are sticky, so the hydraulic oil will occur constantly friction conditions flow in the pipeline, the constant friction and must be consumed to overcome the friction energy, we call this part of the energy consumed by the pressure loss.
 
升降机厂家谈到压力损失分为两种，即沿程损失以及局部损失。沿程损失指的是当液体在直观中进行直径不变的流动时，因为摩擦的关系而产生压力损失。而局部损失是指由于管路之中存在有截面的情况，这导致液压油会出现液流方向改变或者其他的形式而引起压力损失，在液压系统之中，我们把压力损失等于沿程损失跟局部损失之和。
Lift manufacturers Speaking pressure loss is divided into two, namely, loss and partial loss along the way. Loss along the way refers to a constant diameter when the liquid flow in an intuitive, since the relationship between the friction generated by the pressure loss. The partial loss is due to the presence of cross section of the pipeline, and that this leads to the hydraulic fluid flow direction change occurs, or other forms of pressure loss caused by, among the hydraulic system, the pressure loss is equal to our loss along the way with and partial loss.
 
升降机厂家建议在液压系统之中压力损失是不可避免的，所以泵的额定压力要比系统工作时的所需要最大工作压力要高，通常情况下液压系统所需要的最大工作压力是乘以一个1.3~1.5的系数来进行估算的。
Among elevator manufacturer recommends hydraulic system pressure losses are inevitable, so the rated pressure of the pump than the maximum operating pressure required for the system to work at the high, normally of the hydraulic system needed to be multiplied by a maximum working pressure of 1.3 ~ 1.5 coefficients for estimation.