Enquire Now
Slide Form

Breather Dryer – BDE


The HYDAC BDE filter is a breather dryer filter.

In hydraulic and lubrication systems, water ingress into the tank is a familiar problem. System operators are constantly faced with a high breakdown and maintenance costs that can be traced back to water in the system. This is because water, even in its dissolved state, causes accelerated degradation of the additive components by hydrolysis. These reactions cause the oil to lose its desired characteristics and to age more rapidly. The depletion of the additives also leads to increased oxidation in the base fluid. Water also has serious and adverse effects on the operating system components, damaging them by corrosion and hydrogen embrittlement.


The distinctive feature of the breather dryers BDE is that it has two separate chambers which can be filled with two desiccants, which in combination increase total water retention (two-stage dewatering). As an option, and as a special protection of the desiccant, four valves are built into the bottom of the unit so that during system shutdown the desiccants will not become saturated. A check valve is available as an option to prevent exhaust air from the tank/ transmission from flowing back through the desiccant. This means the desiccant is protected from oil mist and there is no re-drying of the exiting air.

The built-in pleated air filter element (absolute filtration of particles > 2 µm) provides the filter with a very high contamination retention capacity (26g). In order to ensure reliable function, the entire cartridge must be replaced. When the filter is due to be changed, the colour changes from dark red to light orange.


  • Air flow up to 5,500 l/min
  • Fastening by means of flange, thread, or slip fit connection
  • Installation sizes: 200, 400, 1000
  • Two different desiccants used


Breather / Dryer BDE Series

1299653BDE 200 X 2 W 0.0
1299654BDE 400 X 2 W 0.0
1299655BDE 1000 X 2 W 0.0
1300418BDE 1000 X 2 UBM 0.0
1301705BASE-E-BDE G 1.0
1305476BASE-E-BDE S 1.0
1305477BASE-E-BDE F 1.0
1301703BASE-E-BDE N 1.0
1305480BASE-E-BDE F 1.0 / -RV0.003
1301707BASE-E-BDE N 2.0 / -RV0.003
1305481BASE-E-BDE G 1.0 /-RV0.02
1305485BASE-E-BDE S 1.0 /-RV0.02


Breather / Dryer BD Series adaptors

1275357F-ADAPTOR BD W 1.0
1275475THREADED ADAPTOR BD W 1.0 (3/4")
1275476THREADED ADAPTOR BD W 2.0 (1")
Contact us for more information on this product

HYDAC Australia

HYDAC New Zealand

AUSTRALIA 1300 449 322

AU au-flag NZ nz-flag