When operating hydraulic power packs, humid air is sucked in from the environment to equalize the pressure, which condenses when the dew point is differentiated. Corrosion damage, rapid aging of the hydraulic oil and the degradation of additives are promoted, especially in the case of high humidity and temperature fluctuations. The use of the adsorber protects against this condensation damage by drying the incoming air beforehand. The silica gel in the adsorber also changes color to indicate when the adsorber has reached its maximum water absorption capacity.

Damage caused by water

Particles and water are the cause of 80% of malfunctions and damage in hydraulic systems, gearboxes and rolling bearings.

Consequences:

  • Hydrolyse – Rapid aging and degradation of additives
  • Promotion of corrosion
  • Worse lubrication

How adsorbers work on hydraulic units

The following graphics show in 4 steps, what happens inside a hydraulic power pack without and with an adsorber when the ambient air is enricht with moisture. Just move the handle over the pictures to see the differences.

Left: Hydraulic power pack useing a ventilation filter without desiccant. Ambient air enriched with moisture.
Right: Hydraulic power pack useing an adsorber with desiccant. Ambient air enriched with moisture.

Left: Hydraulic oil is removed from the tank, the oil level drops and pressure is equalized by incoming moist air.
Right: Hydraulic oil is removed from the tank, the oil level drops and pressure is equalized by incoming air. The adsorber seperates moisture up to 2% rH (10% rH on average).

Left: Hydraulic oil is pumped back into the tank, the oil level is rising and pressure is equalized by outgoing moist air
Right: Hydraulic oil is pumped back into the tank, the oil level is rising and pressure is equalized by outgoing dry air.

Left: When the ambient air is cooling below drew point, condensation takes place within the hydraulic unit and water drops contaminate the hydraulic.
Right: When the ambient air is cooling below drew point, no condensation takes place within the hydraulic unit and the hydraulic oil is not contaminated with water.

Humidity and dew point

Absolute Humidity
Content of water vapor
Relative Humidity
Percentage to maximum humidity

Example
Temperature = 20°C
Air humidity = 80% rF

Water 13.8g/m³
Dew point 16,4°C

Permissible temperature range = 3,6°C

Moisture after adsorber installation
10% RH on average
Water content: 1,7 g/m³
Dew point: -12,5°C

Find the right size

Adsorber for drying the supply air

Please click on the tank-/shuttle volume below

Adsorbers for the separation of pollutants

Please click on the tank-/shuttle volume below

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Presentation Hydraulic Power Packs

References – Our Adsorbers in action

Lift Bridge

Hydraulic tank: 5000l
Oil: Synthetic esters

Task: Lifting the bridge
Operation approx. 10x per day, filling of cylinders

Adsorber: VV-RV 5XL

Hydropower Plant

Hydraulic tank: 1000l
Oil: synthetic esters

Task: Turbine lubrication
Operation: Continuous operation, circulating oil lubrication

Adsorber: VV-RV 5M

Paper Machine

Hydraulic tank: 800l
Oil: Mineral oil HLP46

Task: Central lubrication system
Operation: Continuous operation, circulating oil lubrication

Adsorber: VV-R 5M

Lock

Hydraulic tank: 600l
Oil: Mineral oil HLP46

Task: Moving the gates
Operation: approx. 20-40x per day, filling of cylinders

Adsorber: VV-DV 3L

Test Stand

Hydraulic tank: 150l
Oil: Mineral oil HLP46

Task: Lubrication of test gearboxes Automotive
Operation: continuous operation, protection against oil mist

Adsorber: VG_D 3L

Straddle Carrier

Hydraulic tank: 55l
Oil: Mineral oil HLP46

Task: brake cooling and steering
Operation: Shift operation, outdoor use, pendulum movement

Adsorber: VV-DV 2L

Tunnel Boring Machine

Hydraulic tank: 400l
Oil: Mineral oil HLP46

Task: Feed drill head
Operation: during use
continuous, low pendulum

Adsorber: MA-DV 3M

Training Plant

Hydraulic tank: 10l
Oil: Mineral oil HLP46

Task: Training / Presentation
Operation: rarely, during
training

Adsorber: VV-DV 2L

Cruise Ship

Hydraulic tank: 60l
Oil: Biodegradable oil

Task: Lowering the lifeboats
Operation: “never” – only during tests and possibly in an emergency

Adsorber: VV-DV 1L

Injection Moulding Machine

Hydraulic tank: 6000l
Oil: Mineral oil HLP46

Task: Closing the casting tools
Operation: Continuous operation, cycle approx. 100sec.

Adsorber: VV-R 5XL

Excavator

Hydraulic tank: 200l
Oil: Biodegradable oil

Task: earthmoving machine, cylinder strokes
Operation: Continuous use, outdoor use, harsh conditions

Adsorber: MA-R 3M + valve adapter 0.5bar

Storage tank Hydraulic oil

Tank capacity: 10.000l
Oil: Mineral oil HLP46

Task: Storage and cleaning of the oil
Operation: 24/7
Protection against humidity by temperature fluctuation and sun

Adsorber: VV-RV + venting system