suggest one possible reason why the hydraulic lift will not work properly if air is in the liquid
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Answer:
One of the greatest attributes of hydraulics as a method of power transmission is great stiffness, which gives a hydraulic system instant, accurate response. Therefore, one of our chief concerns is to make certain that there is no elastic, power absorbing component in a hydraulic system.
Problems resulting from air
Air in the system has the following major effects:
Spongy control — Because fluids are considered to be basically incompressible, we expect great stiffness in a hydraulic system. That is, the positioning of an actuator should be immediate (rapid response) and precise. The larger the amount of free or entrained air, the spongier (softer, less stiff) the system.
Hydraulicspneumatics Com Sites Hydraulicspneumatics com Files Uploads 2013 06 Aeration Figure 1 5
Relatively low air pressures force substantial volumes of air into solution with MIL-H-5606 fluid. | Effect of a vacuum over MIL-H-5606 fluid that is saturated with air. The vacuum withdraws large quantities of dissolved air. Higher temperatures release more air. (click to enlarge)
Loss of horsepower — When an air pocket is present in an actuator, it is alternately compressed and relaxed as the actuator is cycled. Since the air pocket must first be compressed before the fluid can cause the actuator to move, power is consumed. Upon relaxation, the air pocket expands and rives fluid out. The stored power, therefore, is expended in driving fluid back into the reservoir and not in moving the actuator.
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