Hydraulic energy absorption
Hydraulic Shock Absorbers
EKD hydraulic shock absorbers cover adjustable EK/EKL, self-compensating EN and long-life ES ranges. Published models span 4–7,300 J per cycle and 4–165 mm stroke for automation, packaging and machinery stops. Check the exact model and hourly duty before selection.
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Working principle
Hydraulic oil is forced through calibrated or adjustable orifices as the piston moves, converting kinetic energy into heat and controlling deceleration.
Construction
Threaded cylinders, piston rods, bearings, orifice systems, return springs or accumulators, optional caps and mounting accessories.
Applications
Automation axes, pneumatic cylinders, motor-driven slides, packaging equipment, robotics and repeatable machine stops.
EK, EN or ES: choose the damping approach first
EKD hydraulic shock absorbers cover adjustable EK/EKL, self-compensating EN and long-life ES ranges. Published models span 4–7,300 J per cycle and 4–165 mm stroke. The ranges below are catalogue envelopes, not a guarantee that every energy and stroke combination is available.
1. Establish the stopping duty
Provide moving mass, impact speed, drive force, available stroke and cycles per hour.
2. Compare both energy limits
Check energy per cycle and per hour, effective mass, approach speed and force against the exact model.
3. Confirm installation and return
Check thread, stop position, side loading and return requirements before ordering. A matching thread alone does not confirm suitability.
Hydraulic series decision table
| Series | When to consider it | Published energy per cycle | Confirm before selection |
|---|---|---|---|
| EK / EKL | External adjustment for commissioning or changing impact conditions; EKL for lower approach speeds. | 7–7,300 J | Model speed envelope, setting, stroke and hourly duty. |
| EN | Self-compensating, non-adjustable damping for repeated stops within the model’s operating envelope. | 4–5,650 J | Impact speed, effective mass and hourly energy. |
| ES | Integrated non-adjustable construction for demanding repetitive duty; long-life series. | 16–110 J | Exact configuration, environment and required service life. No verified universal cycle-life multiplier. |
Sources and selection boundaries
Ranges are from the published product database reviewed on 21 October 2026. Nm of absorbed energy is equivalent to J. Do not select from energy alone or infer a fixed service life from the ES name.
Series in this family
EK / EKL Adjustable Hydraulic Shock Absorbers
EKExternal damping adjustment helps match the absorber to changing impact conditions. The EKL range addresses lower approach speeds.
Available for absorber selector
EN Self-Compensating Shock Absorbers
ENA compact, non-adjustable range for repetitive stopping duties. Self-compensating metering accommodates the operating envelope specified for each model.
Available for absorber selector
ES Long-Life Shock Absorbers
ESAn integrated, non-adjustable range developed for demanding repetitive-duty applications, with model-specific and stainless-steel options.
Available for absorber selector