Nitorgen Boost on Hydraulic Oil free surface

[hydraulicsman]

Does anybody have examples of a boosted hydraulic system that uses nitrogen applied directly onto the free surface of the oil within the reservoir? the boost is between 3-8bar.

 

[hydromech]

Large hydraulic presses have direct contact balancing systems with nitrogen in free contact with the oil. They also have pre-fill tanks above the main cylinder the keep the cylinder full on the rapid down strokes. These are air loaded to maintain a positive pressure.

The are also lots of free contact accumulators in the market.

 

[hydraulicsman]

Thanks for your response.
Does gas entrainment not have an impact on system stiffness and reponse? Are we presuming the surface is relatively still?

 

[hydromech]

Yes...

As long as the surface tension of the oil is not disrupted too much, the oil does not absorb N2.

Rather like a carbonated drink that releases carbon dioxide and fizzes when disturbed, the oil will absorb the gas if it is shaken up.