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Breather Dryer
BDE
1. TECHNICAL
SPECIFICATIONS
1.1 DEFINITION OF THE PROBLEM
In hydraulic and lubrication systems,
water ingress into the tank is a familiar
problem. System operators are
constantly faced with 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 uid. Water also has serious
and adverse effects on the operating
system components, damaging them by
corrosion and hydrogen embrittlement.
1.2 FILTER HOUSING
Construction
The distinctive feature of the breather
dryers BDE is that it has two separate
chambers which can be lled 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 downtime the desiccants will not
become saturated.
A check valve is available as an option
to prevent exhaust air from the tank/
transmission from owing back through
the desiccant. This means the desiccant
is protected from oil mist and there is no
re-drying of exiting air.
1.3 FILTER MEDIUM
The built-in pleated air lter element
(absolute ltration of particles > 2 µm)
provides the lter with a very high
contamination retention capacity (26g).
In order to ensure reliable function, the
entire cartridge must be replaced.
When the lter is due to be changed,
the colour changes from dark red to light
orange.
1.5 SEALS
NBR (= Perbunan)
1.6 SPECIAL MODELS AND
ACCESSORIES
On request
1.7 SPARE PARTS
See Original Spare Parts List
1.8 CERTIFICATES AND APPROVALS
On request
1.9 COMPATIBILITY WITH
HYDRAULIC FLUIDS ISO 2943
The lter cartridge actively prevents
contamination particles and humidity
from entering the tank. Compatible
with mineral oils and bio oils.
Caution: The new BDE is not suitable
as a breather for reservoirs containing
highly ammable liquids (e.g. fuel,
solvents, etc...)!
1.4 FILTER SPECIFICATIONS
Temperature range -30 °C to +100 °C
Storage temperature: -40 °C to +100 °C
Material of lter housing Plastic (PA, PC and POM)
Material of lter cartridge unit Combination of 2 different
desiccants
Material of air lter element phenolic resin impregnated paper
BDE 200
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1.10 CHANGING INTERVALS
When the lter is due to be changed,
the colour changes reliably from dark
red to light orange.
Symbol: BDE with valves
Inlet
Ambient air
BDE 400 BDE 1000
Outlet
Ambient air
Outlet
Tank - Gearbox
air lter 2µm
desiccant
A
desiccant
B
Symbol: BDE without valves
Inlet
Ambient air
Outlet
Tank - Gearbox
air lter 2µm
desiccant
A
desiccant
B
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BDE 400 G 2 W 1 . X /-RV0.02
Filter type
BDE
Size of lter
200, 400, 1000
Type of connection
F Flange (to DIN 24557)
G Thread
N Thread NPT
M Thread metric
S Slip t
Filtration rating in µm
2 2 µm absolute
Type of clogging indicator
W without port, no clogging indicator
K pressure gauge
UBM vacuum indicator
Type code (TKZ)
Type code Thread
connection G
Thread
connection N
Thread
connection M
Slip t
connection S
Flange
connection F
1 1BSP NPT 1" M42x2 1" T2
2 – NPT 2" – – –
Modication number
X the latest version is always supplied
Supplementary details
ELF with ller strainer (only for connection type F = Flange)
RV0.02 check/protection valve with 0.02 bar pressure setting
RV0.003 check/protection valve with 0.003 bar pressure setting
2.2 REPLACEMENT CARTRIDGE
BDE 400 X 2 W 0 . X
Filter type
BDE
Size
200, 400, 1000
Connection type
X replacement cartridge
Filtration rating
2 2 µm absolute
Type of clogging indicator
W without port, no clogging indicator
K pressure gauge
UBM vacuum indicator
Type code
0 replacement cartridge
Modication number
X the latest version is always supplied
2. MODEL CODE (also order example)
2.1 COMPLETE FILTER
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4. DIMENSIONS
3. FILTER CALCULATION /
SIZING
3.1 SIZING GUIDELINES
The rate at which contamination
enters a hydraulic system can be
considerably reduced by using efcient
tank breather ltration.
CAUTION:
Incorrectly sized tank breather lters
can place additional strain on the
system and reduce the service life of
hydraulic lter elements.
3.2 SIZING / AIR FLOW RATE
The following table indicates the size
of BDE lters for gearbox lubrication in
wind power plants
(According to size in megawatts).
≤ 1
MW
1-3
MW
≥ 3
MW
Standard
conditions
200 400 1000
Longer service life/
service intervals
400 1000 2x1000
Very humid
climate
400 1000 2x1000
Additional information on sizing
criteria:
Size Optimum
air ow
rate *
[l
air
/ min]
Max.
drying
capacity for
average
humidity
[m³
air
]
Max.
drying
capacity for
high
humidity
[m³
air
]
200 10 10 6
400 20 25 15
1000 35 42 25
* Air ow rate with the highest
drying efciency
3.3 WATER RETENTION CAPACITY
Size Maximum water retention capacity
200 0.25 l
400 0.50 l
1000 0.75 l
Type Weight (kg)
BDE 200 1.7
BDE 400 2.3
BDE 1000 3.0
Connection Thread length
B [mm]
AF width
SW [mm]
1" Slip t connection
Ø 33.4
18 50
G 1" 18 50
M42 x 2 18 50
NPT 1" 18 50
NPT 2" 24 65
Flange adapter
DIN24557/Pt 2
20 50
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NOTE
The information in this brochure relates to the operating conditions and
applications described.
For applications or operating conditions not described, please contact the relevant
technical department.
Subject to technical modications.
HYDAC FILTERTECHNIK GMBH
Industriegebiet
D-66280 Sulzbach/Saar
Tel.: 0 68 97 / 509-01
Fax: 0 68 97 / 509-300
Internet: www.hydac.com
E-Mail: lter@hydac.com
NOTES
