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53
1. DESCRIPTION
1.1 FUNCTION
Fluids are practically incompressible and
cannot therefore store pressure energy.
The compressibility of a gas is utilised
HYDAC diaphragm accumulators are
based on this principle, using nitrogen as
the compressible medium.
A diaphragm accumulator consists of a
diaphragm acting as the gas-proof screen.
hydraulic circuit so that the diaphragm
pressure increases and the gas is
compressed. When the pressure drops,
the compressed gas expands and forces
At the base of the diaphragm is a valve
poppet. This shuts off the hydraulic outlet
empty and thus prevents damage to the
diaphragm.
NOTE
Pressure Equipment Directive
PED 97/23/EC and the German industrial
z
No. 3.551
Hydraulic
Diaphragm Accumulators
HYDAC diaphragm accumulators
1.2.1 Weld type
z
on the gas side or, alternatively,
completely sealed. Fluid connection
available in various types
z
and gas sections
valve poppet set into the base of the z
diaphragm
1.2.2 Screw type
z
connection
z
connection
z
vulcanized valve poppet set into the z
base of the diaphragm
z
sections of the accumulator together
valve poppet
valve body
diaphragm
pressure vessel
valve poppet
valve body
diaphragm
pressure vessel
1.2.3 Diaphragm materials
The diaphragms are available
NBR (acrylonitrile butadiene rubber, z
PERBUNAN),
IIR (butyl rubber), z
z
®
),
ECO (ethylene oxide z
epichlorohydrin rubber).
The material must be selected according
temperature.
must be made for the fact that the gas
elastomer temperature if there are adverse
discharge conditions (high pressure ratio
p
2
/p
0
, high discharging velocity). This can
cause cold cracking in the elastomer.
The gas temperature can be calculated
1.2.4 Corrosion protection
corrosion protection, such as plastic
coating or a galvanic or chemical surface
all types can be supplied in stainless steel.
contamination collecting, a vertical position
bottom).
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1.4. TYPE OF MOUNTING
directly inline.
Where strong vibrations are expected, the
accumulator must be secured to prevent it
a suitable support console can be ordered.
Additional male threads on the hydraulic
mounting holes - see Table 3.1
z
No. 3.502
1.5. GENERAL
1.5.1 Permitted operating pressure
see tables 3.1. and 3.2.
The permitted operating pressure can
differ from the nominal pressure for foreign
1.5.2 Nominal volume
see tables 3.1. and 3.2.
1.5.3 Effective gas volume
Corresponds to the nominal volume of the
diaphragm accumulator.
1.5.4 Effective volume
the operating pressures p
2
and p
1
.
1.5.5 Fluids
Mineral oils, hydraulic oils.
1.5.6 Gas charging
protective pre-charge.
Higher gas pre-charge pressures are
or sealed gas connection).
Hydraulic accumulators must only be
Never use other gases.
Risk of explosion!
1.5.10 Certicate codes
in countries outside Germany are supplied
country. The user country must be stated
at the time of ordering.
HYDAC pressure vessels can be supplied
In some of these the permitted operating
pressure can differ from the nominal
pressure.
examples of the codes used in the model
code for different countries of installation.
Australia F
1)
Brazil U
3)
2)
China A9
EU member states U
Hungary U
3)
India U
3)
Japan P
Poland U
Romania U
3)
3)
3)
Ukraine A10
others on request
1)
approval required in the individual territories
2)
approval required in the individual provinces
3)
accumulator shell. After the hydraulic line
has been connected it must be completely
accumulators (repairs, connecting
pressure gauges etc) must only be carried
been released.
Please read the operating manual!
No. 3.100.CE
NOTE:
Application examples, accumulator sizing
and extracts from approvals regulations on
hydraulic accumulators can be found in the
Accumulators z
No. 3.000
1.5.7 Permitted operating temperature
-10 °C ... +80 °C
263 K ... 353 K
for material code 112.
Others on request.
1.5.8 Permitted pressure ratio
Ratio of maximum operating pressure p
2
to gas pre-charge pressure p
0
.
1.5.9 Max. ow rate of operating uid
of approx. 10% of the effective gas volume
must remain in the accumulator.
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55
2. TECHNICAL SPECIFICATIONS
2.1. MODEL CODE
(also order example)
SBO210 – 2 E1 / 112 U – 210 AK 050
Series
Nominal volume [l]
Type
2)
Weld type:
E1 = rechargeable M28x1.5
E2 = sealed gas connection,
4)
E3 = rechargeable,
gas valve M16x1.5 / M14x1.5
Screw type
A6 = rechargeable M28x1.5,
exchangeable diaphragm
A3 = gas valve M16x1.5 / M14x1.5,
exchangeable diaphragm
Material code
2)
Fluid connection
1 = carbon steel
3 = stainless steel 1.4571
1)
Accumulator shell
0 = plastic coated
1 = carbon steel
1) 3)
4 = stainless steel 1.4571
Diaphragm
2 = NBR20 (acrylonitrile butadiene)
3 = ECO (ethylene oxide epichlorohydrin)
4 = IIR (butyl)
7 = other (on request)
Certication code
2)
U = PED 97/23/EC
For other countries see table
Permitted operating pressure [bar]
Fluid connection
2)
form
e.g. Form AK = G 3/4
Pre-charge pressure p
0
[bar] at 20 °C, must be stated separately, if required!
4)
1)
2)
not all combinations are possible
3)
4)
only for type E1- or E2, for scheduled orders
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3. TECHNICAL SPECIFICATIONS
– non-exchangeable diaphragms –
3.1.1 Drawings
Diag. Type Gas side connection Fluid side connection*
E1 E2 E3 AK AB
1
2 –
3
on request
4 –
hex. hex.
hex.
hex.
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3.1.2 Dimensions
Nom.
vol.
1)
Perm.
press.
ratio
U
R ØD
Weight
Q
2)
Standard uid connection
Diagram
Permitt. oper.
pressure [bar]
Form AK Form AB
[l]
p
2
0
Carbon
steel
steel
[mm]
[mm]
[kg]
[l/min]
F
ØG
[mm]
L
[mm]
B1
[mm]
hex.
F
H
DIN 13
L
[mm]
B2
[mm]
hex.
0.075
250 250 – 91 64 0.7
38
G 1/2
–
14
21
30 not available
1
0.16
210 210 180 103 74 0.8
300 300 – 108 78 1.1
0.32
210 210 160 116 93 1.3
95
300 300 – 120 96 1.8
0.5
160 160 – 130 102 1.3
210 210 – 133 105 1.7
0.6 330 330 –
151
115 3.3
34 41 G 1/2 M33x1.5
14 37
41
0.7 100 100 – 106
1.8
0.75
140 140 – 142 116
210 210 140 147 121 2.8
250 250 – 152
126
3.6
15 42
330 330 – 140 4.0 26 3
1
200 200 – 159 136 3.6
21 14 37
1
250 250 – 192
126
4.4 2
330 330 – 169 4.8 26 15 42 4
1.4
140 140 – 173 145 3.9
21
14
37 1210 210 – 178 150 5.4
250 250 – 185 153 5.9
15
330 330 – 172 155 7.6 33 42 3
2
100 100 100 190 160 4.0
150 G 3/4 44 16
28
46 G 3/4 M45x1.5 16
33
46
1
210 210 – 198 167 6.6
250 250 – 232 153 7.4 2
330 330 – 181 172 9.2 43 42 3
2.8
210 210 –
250
167 8.2
28 33 2
250 250 – 170 7.8
330 330 – 237 172 11.0 43 42 4
3.5
250 210 – 306 170 11.2 28 33 2
330 330 – 274 172 13.8
44
42 4
4
50 – 50 294 158 5.0
33 2
250 – 180 306 170 11.2
1)
Others on request
2)
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3.2.2 Dimensions
Nom.
vol.
1)
Perm.
press.
ratio
U
Weight
A B ØD ØL M N O ØP R Q
2)
Standard uid
connection
Diagram
Permitt. oper.
pressure [bar]
Form AK
[l]
p
2
0
Carbon
steel
steel
[kg]
[mm]
[mm]
[mm]
[mm]
[mm]
[mm]
[mm]
[mm]
[mm]
[l/min]
F
[mm]
ØG
[mm]
K
0.1
500 500 – 1.9 110 30 95 – 53 35
– – – 95 G 1/2 14
–
36
5
0.25
500 500 – 3.9
129 20
115
92 56
55
500 – 350 4.9 125 60
750 – 750 9.0 136 11 153 114 57.5 63 27
0.6 450 450 250 5.7 170 19 140 115 68 57 34 41
1.3 400 400 – 11.2 212 28 199 160 97 65
M8
180
10 150 G 3/4 16 44 50
2 250 250 180 11.4 227 17 201 168 101 64 188
2.8 400 400 – 22.0 257
30
252 207 106 80 230
4 400 400 – 34.0 284 287 236 127.5 90 265
1)
Others on request
2)
Technology GmbH
Industriegebiet
D-66280 Sulzbach/Saar
4. NOTE
The information in this brochure relates to the operating conditions and applications
described. For applications and operating conditions not described, please contact the
relevant technical department.
– exchangeable diaphragm –
3.2.1 Drawings
Type A6 Type A3
Diagram 5
Fluid connection AK
