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Hydraulic Oil You Can Cook With?

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DescriptionHave you ever travelled into a poor puddle water just to have your miserable engine lock solid after ingesting a cylinder full? This is whats called hydraulic lock and is a pricey demonstration of hydraulic power which hydraulic oils convey.

With this commentary I will be centering on hydraulic fluids in contrast to brake fluids, that happen to be an extremely specialized sub grouping.

Functions and properties

The key objective of hydraulic oils is usually to convey power. Nonetheless, there are other significant functions of present hydraulic fluids.

The table below lists the primary functions of hydraulic oil and the properties of 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

• Cold 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


Dating back to ancient Egypt the way of hydraulic fluid was water. It absolutely was only in the 1920s that mineral oil has become used. This is due to oils inherent lubrication properties and performance at temperatures across the boiling point of water. Today most hydraulic fluids depend on mineral oil base stocks plus much more recently synthetic alternatives.

Current hydraulic oils can include a number of chemical substances, 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, for example farm tractors and marine dredging (and then there may be the results of an oil spill from the ruptured oil line), biodegradable hydraulic oils based on rapeseed (Canola) vegetable oil can be used (often mixed with tailored synthetic esters). Typically these oils can be found as ISO 32, ISO 46, and ISO 68 specification oils

Other base stocks are used for specialty applications, such as for fire resistance and extreme temperature applications. Some examples embrace: glycol, esters, organophosphate ester, polyalphaolefin, propylene glycol, and silicone oils (For Brake fluids).

Aircraft hydraulic systems

As aircraft performance improved, so the force required to activate mechanical flight controls increased, and hydraulic systems were brought to ease pilot effort. Hydraulic power is also employed to start the auxiliary power unit (APU) for self-starting the aircraft's main engines. While several aircraft equipped with the M61 family of cannon, exploit hydraulic chance to drive the gun system, permitting reliable high rates of fire.

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Created15 Jul 2019
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