While this may be good to know, what does it really mean to a hydraulic equipment owner? Thus, inadequate viscosity due to high temperatures creates a destructive cycle of rising temperatures, accelerated wear and increased internal leakage.Īdvances in VI improver technology mean that mineral hydraulic oils with a shear-stable viscosity index in the 150 to 200 range are commercially available. This negatively affects the volumetric efficiency of the hydraulic system as the hydraulic fluid can bypass critical pump clearances. At high operating temperatures, a standard VI oil has a lower viscosity than a high VI oil.Additionally, possible loss of the lubricating film creates high contact temperatures and excessive wear and ultimately can result in pump seizure. This negatively affects the mechanical efficiency of the hydraulic system, resulting in reduced system performance, lubricant starvation and pump cavitation. At low operating temperatures, a standard VI oil has a higher viscosity than a high VI oil.The higher the viscosity index, the less the oil's viscosity will change with temperature changes. The viscosity index is a measure of an oil's ability to maintain its viscosity under different temperature conditions. High VI hydraulic oil has a higher viscosity index than standard hydraulic oil. However, with the evolution of technology, standard hydraulic oil has become outdated, and High VI (Viscosity Index) hydraulic oil is rapidly replacing it. It is used to transmit power, lubricate, and cool the hydraulic system's moving parts. Hydraulic oil is an essential component of hydraulic systems that play a crucial role in a wide range of industrial applications, including manufacturing, construction, and transportation.
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