The VV-D series.

Disposable adsorbers without valves for indoor, outdoor & offshore use

GIEBEL Adsorber® of the VV-D series are disposable aeration dryers without valves. They are suitable for indoor, outdoor and offshore use on hydraulic power packs, gearboxes, drums and IBCs as well as on mobile machinery.
The plastic housing is filled with GIEBEL Xdry®. The desiccant mixture ensures effective drying of the supply air. A 3 μm filter additionally cleans the intake air. When air is forced out of the system, a layer of activated carbon adsorbs escaping oil mist, thus protecting the desiccant and the environment from contamination. When the adsorber is saturated, it is replaced. We recommend the use of the VV-D series especially for plants with permanent air exchange and short maintenance intervals.

Mode of operation.

Adsorption – drying of the supply air

  • The filling level of the system decreases
  • Humid air is sucked in
  • Air flows into the adsorber without pressure
  • Uniform flow through the adsorber
  • Air is dried to 2% rH
  • GIEBEL Xdry® discolors as saturation increases
  • Air is filtered to 3μm

Dry and clean supply air

Desorption – separation of oil particles

  • The filling level of the system increases
  • Dry, oily air is squeezed out
  • Activated carbon absorbs the oil mist
  • Dry, oil-free air regenerates the desiccant
  • GIEBEL Xdry® partially recovers its color

Self-regeneration and oil-free exhaust air

Technical data.


The sucked-in air flows through the openings in the lower part of the adsorber almost without pressure. The air is then evenly distributed across the cross-section. The pre-filter disc frees the air from coarse dirt particles.

When flowing through the desiccant, the water molecules are reliably removed from the air. The gap volume of the granulate is optimally selected with 2 to 5mm grain size and guarantees a minimum pressure build-up with very good drying efficiency at the same time. Thus, a residual air humidity of max. 2% rH and a dew point of -40°C are achieved at the beginning of the drying process. A 3µm filter ensures that all dirt particles are separated from the ambient air and the GIEBEL Xdry® fill and that the connected plant is not contaminated.

When air is discharged, a two-stage slosh protection and a layer of activated carbon prevent oil droplets, oil particles and oil mist from entering the desiccant, thus enabling the adsorber to self-regenerate.

With increasing saturation, the orange silica gel grains of the GIEBEL Xdry® fill turn green. If the silica gel grains have turned completely green, the adsorber must be replaced.

Pressure ratios.

Replacement cartridges.

Currently, no replacement cartridges are available for the VV-D series. Here, the complete adsorber is replaced after complete saturation.