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The problems with the vacuum would be that the resulting force would always be less than 1bar times the cross-section. In a typical dampener the pressure of the N2 (or compressed air) is a few bars, which results in a much more compact cross-section. It is difficult to maintain a vacuum Even if you could create a vacuum, it is very difficult to maintain ...

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Most car suspensions are based on a spring - used to be flat cart type but now most cars have coil springs. Some cars did go with a hydraulic suspension - early minis come to mind. If you really mean the shock absorber, or damper, then they can be pressurized and tend to use oil. Never seen a vacuum based system on trucks or cars but it might have been done -...

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What you are seeing in the video is a vacuum generator/vacuum ejector/aspirator. Figure 1: Venturi effect (source: wikipedia) It uses the principle of the Venturi effect. I.e. that for steady, incompressible, inviscid when there is an increase of speed there is a drop in static pressure. This is mathematically expressed as: p_1-p_2 =\frac{\rho}{2} (v_2^2- ...

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A pilot operated valve (often unfortunately generalized as a "solenoid valve") uses a small control solenoid valve and the pressure differential across the valve to open a diaphragm that allows flow to pass. This is a very common design because it allows for a large flow to be controlled with very little energy. This YouTube video has a good ...

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