The VV-D series.

Adsorption - Drying of supply air

• The level in the system decreases
• Humid air is sucked in
• Air flows pressureless into adsorber
• Uniform flow through the adsorber
• Air is dried to 2%rH
• Giebel Xdry® changes color
• Air is filtered to 3μm

Dry and clean supply air

Desorption - Separation of oil particles

• The level in the system increases
• Dry, oily air is squeezed out
• Activated carbon absorbs oil mist
• Dry, oil-free air regenerates Giebel Xdry®

• Giebel Xdry® partially recolors

Self-regeneration and oil-free exhaust air

Flowchart

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.