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• Highly efficient, special filter material
• Filtration of very fine particles and high dirt holding capacity across a broad pressure differential range
• Minimizes the risk of corrosion in the hydraulic tank
• Filter cartridge as well as water-absorbing granules exchangeable
• Optional check valves to avoid air exchange at no-load operation
• Optional adapter plate including check valve for discharge air from tank, without filtration
• Air filtration and dehumidification in fluid systems

In hydraulics, air exchange at the fluid tank must be ensured at all times. Depending on the machine cycles, air is sucked into the tank and pressed out again. The air contains miniature particles as well as water steam. Due to temperature variations, the exchanged air condenses and stimulates the oxidation process of the oil. This leads to corrosion resulting in damage to the fluid tank. By means of the Rexroth BFSK breathing and air bleed filter, the fluid tank can suck in and give off clean and dry air. It is intended to be directly attached to a tank. The BFSK breathing and air bleed filters basically consist of an unscrewable replacement cartridge (1) with an integrated, pleated filter element (2) and an air filter housing (3). The air filter housing (3) is filled with water-absorbing granules (WA granules) (4). Optionally, check valves (5) can be integrated. The BFSK breathing and air bleed filter is available with and without integrated check valves. The version with integrated check valves is primarily used in wind turbines. The WA granules contain red indicator beads. The water saturation is indicated by a color change from red to orange. In addition, the optionally available visual maintenance indicator provides information on the state of the filter. The maintenance indicator (7) is connected using an adapter plate (6), which is sold separately. In addition, the adapter plate makes a direct connection to the fluid tank possible.

Standard version without check valve (Figure 1):

The contaminated air is transported to the WA granules (4) via opening A, is dried there and then flows through the pleated filter element. Solid dirt particles are captured here. Via connection T, only dried and filtered air gets into the tank. Air escaping from the system in the opposite direction is dried as well.

Version with check valve (5) in BFSK (Figure 2):

Functions in the same way as the standard version; but includes check valves (5) to prevent air exchange at no-load operation.

Version with check valve in the adapter plate (6) (Figure 3):

Functions in the same way as the standard version; but the escaping air, which may be mixed with oil mist, is diverted directly from the tank upstream of the filter via connection B into the environment.