The VG-D series

GIEBEL Adsorbers® of the VG-D series are disposable oil mist separators without valves. They are suitable for indoor and outdoor use on hydraulic power packs, gearboxes, barrels & IBC.
The plastic housing is filled with 0.1kg to 3.0kg of activated carbon. Combined with a slosh guard and oil demister, the activated carbon cleans the air exiting the unit, protecting the environment from oil aerosol contamination. When the adsorber is saturated (discoloration of the white silica gel layer), it is replaced. VG-D adsorbers are used on turbo gearboxes, test benches and recirculating oil lubrication systems.

Move the mouse pointer over the blue highlighted adsorber components of the VG-D and learn which task they perform in the adsorber.

Mode of operation

Adsorbtion – Separation of oil particles

  • The level in the system increases
  • Oily air is squeezed out
  • Slosh protection and demister prevent oil drops and finer oil particles from escaping from the system
  • Glass fiber filter separates further particles
  • Activated carbon absorbs finest oil aerosols

Oil-free exhaust air

Desorption – Filtration of supply air

  • The level in the system decreases
  • Polluted air is sucked in
  • Pre-filter disc prevents the ingress of larger dirt particles
  • Air flows pressureless into adsorber
  • Glas fibre filter filters air to 3μm

Dry and clean supply air

Technical Data


Excess pressure in the system forces the air through the two-stage slosh protection. Here, the large oil particles are blocked and drip back into the system. The subsequent demister is used for condensation of larger oil particles, which stick to it, condense and also drip back.

Finer particles are separated at the 3µm glass fiber filter and returned to the tank. Only the finest oil aerosols end up in the high bulk activated carbon. The 4mm cylindrical pellets adsorb all remaining particles and thus protect the environment from contamination. At the end of the adsorber life cycle, the bottom white silica gel layer turns a brownish oil-like color, indicating the end of the operating interval.

Due to the valveless design and multi-stage separation, this adsorber has a high efficiency for separating particles from the system to the environment and a low differential pressure.

VG-D adsorbers are made of polycarbonate, polyamide, activated carbon as well as FKM seals and can be used for the deaeration of all common hydraulic and gear oils, lubricants, fuels and isocyanates.

Pressure ratio


There is currently no Spare Part Kit available for the VG-D series. After complete saturation, the entire adsorber is replaced.