Reinventing the industrial shock absorber

In the case of a shock absorber, F = PA, where P = pressure and A = area. Because existing shocks already operate at 8,000 to 12,000 psi, the best approach was to increase the piston diameter and area, rather than pushing operating pressures beyond recommended limits.
Not surprisingly, a larger piston,Hydraulic speed controls , and metering tube consumed valuable space inside the shock absorber.
Additional volume was lost as a direct result of the goal to create a fully threaded body, which eliminated an oversized midsection that housed the closed-cell foam accumulator.
Accumulators adjustable shocks  are a key element in shockabsorber performance. When the piston strokes, the foam accumulator collapses to accommodate the displaced oil. Typically, foam compression should be on the order of 20 to 25%.
The most expedient method to recover the lost volume was to hollow out other internal parts of the system and fill them with foam. Unfortunately, the best results with this method compressed the foam from 40 to 45%. These prototypes failed under test due to deterioration of the closed-cell foam.