The VV-DV series: Breather dryers to protect hydraulics & gears under dusty environments or when minimal pressure build-up is required against moisture damage.
No corrosion inside your tank
No quality degradation of operating oils
Recommended for use on low-breathing systems
Suitable for indoor, outdoor & offshore use
Components.
Hover over the components of the adsorber and find out what important tasks they perform to keep your systems dry and clean.
ADSORPTION PROCESS:
If the oil level in the system drops, air flows in to equalize pressure. This air enters the adsorber via the openings (G) and flows through a coarse filter (F), which separates larger dirt and dust particles. The GIEBEL Xdry® filling (D) then separates moisture up to 2% RH (average 10% RH). A 3μm filter (C) removes even the finest dirt and dust particles from the supply air.
Dry and clean air enters the system.
DESORPTION PROCESS:
If the oil level rises, air is pressed out of the system. This air contains oil particles and aerosols. Larger oil particles condense on the oil demister (E) and drip back into the system. Finer oil particles and aerosols are separated by the activated carbon (B). Some of the previously adsorbed moisture is removed from the desiccant as the air flows out, ensuring cyclical self-regeneration.
Clean air escapes the system.
Downloads.
Pressure ratios.
Mode of operation.
Adsorption - Drying of supply air
- The level in the system decreases
- Humid air is sucked in
- Valves open at approx. 5mbar
- 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
Technical data.
Flowchart
The sucked-in air opens the valves in the lower part of the adsorber already at approx. 6mbar. After flowing into the adsorber, the air is evenly distributed over 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 5 mm 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.
As saturation increases, 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.