Des-Case VentGuard Desiccant Breathers

desiccant breather ventguard series des case photo

Ideal for low-flow installations with intermittent operations, the Des-Case VentGuard Breather features unique check-valve technology that ensures the unit only allows air in when the machinery is active, thus maintaining isolation.

Des-Case designed the check-valves to operate without excessive pressure build-up and only allow the airflow when pressured to do so. Furthermore, the filters clean and dry the air before it enters the headspace.

The VentGuard breather thus eliminates premature saturation of the silica gel as well as extends the lifespan of the breather. In comparison, standard desiccant breathers will not be able to handle environments of extreme moisture with the same efficiency and reliability.

Product Details

Specs/Model DC-VG-BB DC-VG-1 DC-VG-2 DC-VG-3 DC-VG-4
Unit Height 3.90 in 5.31 in 6.125 in 8.125 in 10.125 in
99.06 mm 134.9 mm 155.6 mm 206.4 mm 257.2 mm
Unit Diameter 2.52 in 2.52 in 4 in 4 in 4 in
64.01 mm 64.01 mm 101.6 mm 101.6 mm 101.6 mm
Connection Size 3/8 inch Multi-Fit
3/8 inch Multi-Fit
1 inch Multi-Fit
1 inch Multi-Fit
1 inch Multi-Fit
Silica Gel Amount

0.13 lbs

0.28 lbs 0.66 lbs 1.22 lbs 1.88 lbs
0.058 kg 0.127 kg 0.30 kg 0.56 kg 0.85 kg
Adsorption Capacity 0.79 fl oz 1.68 fl oz 4.00 fl oz 7.45 fl oz 11.3 fl oz
23.3 ml 49.7 ml 118.2 ml 220.3 ml 353 ml
Max. Flow Rate @ 1 psid 1.45 cfm 1.45 cfm 2.44 cfm 2.48 cfm 2.98 cfm
41 lpm 41 lpm 69 lpm 70 lpm 84 lpm
Filter Efficiency 3µ abs. (β₃≥200) 3µ abs. (β₃≥200) 3µ abs. (β₃≥200) 3µ abs. (β₃≥200) 3µ abs. (β₃≥200)
Operational Temp. Range -20°F to 200°F -20°F to 200°F -20°F to 200°F -20°F to 200°F -20°F to 200°F
-29°C to 93°C -29°C to 93°C -29°C to 93°C -29°C to 93°C -29°C to 93°C
Removes moisture in equipment headspace
Minimizes wear and tear on equipment, extending the lifespan
Stops ingress of contamination
Eliminates condensation that forms rust
Prevents deposit of sludge as well as water-contaminated oil
Extends the lifespan of lubricants
Model No. Max. Airflow @ 1 psid Gearbox/Storage Tank Hydraulic Reservoir
DC-VG-BB 1.45 cfm 15 gal 2 gal
41.06 lpm 57 liter 8 liter
DC-VG-1 1.45 cfm 35 gal 5 gal
41.06 lpm 132 liter 19 liter
DC-VG-2 2.5 cfm 200 gal 60 gal
70.5 lpm 757 liter 227 liter
DC-VG-3 2.28 cfm 350 gal 100 gal
64.5 lpm 1325 liter 379 liter
DC-VG-4 1.8 cfm 500 gal 200 gal
50.9 lpm 1893 liter 757 liter


Please Note: The above sizing table is only a general guideline. Many other factors such as humidity level, the frequency of airflow, ambient temperatures and chemical compatibility must be considered to determine the size of a breather accurately. Larger applications, as well as special or unusual circumstances, will in many cases require a thorough analysis. Please contact RO-QUIP for help in determining the proper size a breather.



  • Intermittent Operations
  • Gearboxes
  • Low-Flow Applications
  • High-Humidity
  • Washdown

Colour-Indicating Silica

When the silica turns pink, it is time to replace the unit.

Located at the bottom of the breather are check-valves which keep the system isolated until the equipment needs to breathe. Once the machinery becomes operational, the layered filter elements retain solid particulate from the air that moves through the breather. The desiccant beads in their turn absorb harmful moisture.

Both when the equipment is in operation and during shutdowns, the desiccant beads attract moisture from inside the reservoir, in effect drying out the machinery.

Part Number Description
DC-10-S 1 inch FNPT x 1 inch Slip Fit Adapter
DC-10 1 inch Threaded Adapter
DC-10-T 1 inch Male Threaded x 1 inch Female Threaded Adapter
DC-17 Bell Reducer 1 inch to 3/4 inch - Slip Fit
DC-17-T 1 inch - 3/4 inch Female to Male Threaded Adapter
DC-18 1 inch - 1/4 inch Brass, Threaded Reducer/Adapter
DC-12-T Threaded Flange Adapter
DC-12-TG Threaded Flange Adapter with Gasket
DC-15-T Bayonet Adapter
DC-SDVA-12M 3/4 inch NPT Vent Valve Adapter for Standard and VentGuard Breathers
DC-SDVA-16M 1 inch NPT Vent Valve Adapter for Standard and VentGuard Breathers