To achieve controlled linear deceleration, the pressure on the piston area must remain as constant as possible throughout the deceleration stroke. As the piston moves through its stroke, the velocity is constantly decreasing, requiring changes in orifice area to maintain constant pressure. Enertrols adjustable hydraulic shock absorbers meter oil through a computer-calculated series of exponentially spaced orifices in a high-pressure inner tube as the piston rod moves through its stroke. The cross-sectional area of all the orifices is selected by rotating an adjustor.
To maintain constant pressure the piston closes off each orifice as it travels down the bore to end of stroke. Oil displaced by the piston rod compresses a closed-cell, sponge-like material in self- contained, internal accumulator models. Displaced oil may also be routed to an external accumulator for cooling if high cycle rates cause excessively high temperatures.
Dashpots, snubbers and cylinder cushions have only a single, fixed-area orifice, which is why they cannot dissipate energy at a uniform rate. More efficient Enertrols Gold Line adjustable shock absorbers deliver true linear deceleration over a broad range of speed and weight combinations, compensating for changes in both weight and velocity. They are easily fine-tuned to obtain maximum cycle rates with soft, non-destructive stops every time.