• lilyracing4 posted an update 2 months, 1 week ago

    Have you travelled into a bad puddle of water simply to have your miserable engine lock solid after ingesting a cylinder full? This is called hydraulic lock and is also an expensive illustration showing hydraulic power which hydraulic oils convey.

    On this commentary I’m going to be focusing on hydraulic fluids in contrast to brake fluids, that are a really specialized sub grouping.

    Functions and properties

    The aim of hydraulic oils is always to convey power. However ,, there are more significant functions of present hydraulic fluids.

    The table below lists the main functions of hydraulic oil as well as the properties in the fluid that shape its ability to perform that function:

    Hydraulic Performance properties

    • Low compressibility (high bulk modulus)

    • Quick air release

    • Low foaming tendency

    • Low volatility

    Thermal performance

    • Good thermal function and conductivity

    Sealing properties

    • Adequate viscosity and viscosity index

    • Shear stability


    • Satisfactory viscosity for film maintenance

    • Low temperature fluidity

    • Thermal and oxidative stability

    • Hydrolytic stability / water tolerance

    • Purity and filterability

    • Demulsibility

    • Wear reduction characteristics

    • Corrosion control

    Pump efficiency

    • Appropriate viscosity to curtail internal leakage

    • Superior viscosity index

    Special requirements

    • Fire resistance

    • Friction modifiers

    • Radiation resistance

    Environmental impact properties

    • Low toxicity when new or decomposed

    • Biodegradability


    Going back ancient Egypt the mode for hydraulic fluid was water. It had been only from the 1920s that mineral oil began to be used. This became due to oils inherent lubrication properties and satisfaction at temperatures across the boiling point of water. Today most hydraulic fluids are based on mineral oil base stocks plus much more recently synthetic alternatives.

    Current hydraulic oils can have a wide range of chemical compounds, and also: mineral oils, butanol, esters (e.g. phthalates, like DEHP, and adipates), polyalkylene glycols (PAG), phosphate esters (e.g. tributylphosphate), silicones, alkylated aromatic hydrocarbons, polyalphaolefins (PAO) (e.g. polyisobutenes), corrosion inhibitors, etc.

    For environmentally hypersensitive applications, like farm tractors and marine dredging (and then there will be the results of an oil spill from the ruptured oil line), biodegradable hydraulic oils according to rapeseed (Canola) vegetable oil can be used (often mixed with tailored synthetic esters). Typically these oils can be purchased as ISO 32, ISO 46, and ISO 68 specification oils

    Other base stocks can be used for specialty applications, for example for fire resistance and extreme temperature applications. A few examples embrace: glycol, esters, organophosphate ester, polyalphaolefin, propylene glycol, and silicone oils (For Brake fluids).

    Aircraft hydraulic systems

    As aircraft performance improved, therefore the force required to activate mechanical flight controls increased, and hydraulic systems were brought to ease pilot effort. Hydraulic power can be employed to start the auxiliary power unit (APU) for self-starting the aircraft’s main engines. While several aircraft built with the M61 group of cannon, exploit hydraulic power to drive the gun system, permitting reliable high rates of fireplace.

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