?工作油液為一系列油路提供動力源從柱塞泵輸入到油路輸入，流經柱塞泵的油液與流體有不同壓力的油液，是由油液的不同流動方向與流動速度所決定的油在流動過程中與流體產生振動和沖擊現(xiàn)象當活塞桿受到壓力時，油液在油膜組織內與流體發(fā)生混合；當活塞桿受到較大推力并將活塞桿拉出時，由于油膜變形，油液中出現(xiàn)氣泡并在流動過程中產生氣蝕現(xiàn)象。
另外，由于空氣流過油管時也會發(fā)生氣蝕現(xiàn)象，造成油液的流量減小，同時也造成油液污染油液在流動過程中由于摩擦阻力產生一定程度的能量損耗油液在流動過程中會產生流動阻力，其大小與油管長度和流量有關當油路阻力增加到一定程度，油液流量減小導致油管長度和粘度增加并使能量損耗增大。
同時油液流量減少也會導致油液粘度降低，流體的流動性，導致流體流動速度減慢以及空氣流量增加等因素的存在：從而使液體流量減小導致空氣流量增加.導致流量減小導致流體溫度升高.導致液體損耗增加.導致流體流量減小.導致液壓元件中工作油的耗油量出現(xiàn)增加趨勢。
液壓油的工作介質（油、空氣、水甚至空氣中的氧）應符合OHSA1461-1999《燃油和氣態(tài)污染物排放控制標準》的規(guī)定，不允許污染環(huán)境液壓油在實際使用過程中，應滿足OHSA1461-1999《燃油及氣態(tài)污染物排放控制標準》的規(guī)定，其總指標小于等于90mg/L時才可使用，當OHSA1463-1999不能滿足要求時（如在低粘度、高含硫量或高溫度條件下),需更換新油。
而使用新型液壓油時應符合下列要求:1、可根據需要選用不同性能的液壓元件；2、采用不同壓力等級的油管或油蓋；3、采用結構合理、密封性好的液壓接頭；4、在保證高可靠性的前提下盡量選用新型節(jié)能型液壓油因此，對液壓系統(tǒng)來說，液壓元件及其配套設備在使用過程中其性能特點與作用十分重要。
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