升降機廠家介紹說液壓系統中所使用的液壓油都是具有黏性，所以液壓油在管路中不斷地流動時會發生摩擦的情況，而不斷地摩擦中必須要消耗掉克服摩擦力的能量，我們把這部分消耗的能量稱之為壓力損失。
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.
 
升降機廠家談到壓力損失分為兩種，即沿程損失以及局部損失。沿程損失指的是當液體在直觀中進行直徑不變的流動時，因為摩擦的關系而產生壓力損失。而局部損失是指由于管路之中存在有截面的情況，這導致液壓油會出現液流方向改變或者其他的形式而引起壓力損失，在液壓系統之中，我們把壓力損失等于沿程損失跟局部損失之和。
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.
 
升降機廠家建議在液壓系統之中壓力損失是不可避免的，所以泵的額定壓力要比系統工作時的所需要最大工作壓力要高，通常情況下液壓系統所需要的最大工作壓力是乘以一個1.3~1.5的系數來進行估算的。
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.