C04
Series
Name
Displacement
[cm³/r]
Flow rate
at 1450rpm
[l/min]
Max.
Pressure
[bar]
C04 - 8
8
12
210
Mini power pack equipped with variable displacement vane pump
0548111220
2
General description
C04 mini power packs are equipped with high pressure variable displacement vane pumps with hydraulic pressure regulating device that allow you to
instantly adjust the flow rate accordingly to circuit requirements. Variable displacement vane pumps are volumetric type so they deliver a maximum flow
rate equivalent to its displacement for their speed of rotation. Operating pressure is due to pressure loads encountered by the fluid within the system.
When the outlet pressure (on the system) equals the pump setting pressure, the flow rate is adjusted to the values required by the system.
When this value is achieved, pump reduces its flow rate to zero, keeping the pressure almost constant. In zero flow conditions, pump delivers oil only to
compensate any possible drain and piloting.
The new series of C04 mini power packs was created as a response to the increasingly stringent requirements for energy saving and noise reduction on
compact hydraulic systems, where usually are used fixed displacement external gear pumps. This new series of mini power packs gathers 60 years of
experience and innovation applied to hydraulic pumps. It allows high performances combined with extremely compact dimensions, maintaining high
standards of solidity (robustness) and reliability. Replacement of mini power packs with external gear pumps with C04 variable displacement power packs
on systems where work cycle includes pressure and / or speed control phases allows to:
• Reduce the number of components on the system
• Reduce power consumption
• Reduce oil heating
• Reduce or avoid heat exchangers installation
• Significantly reduce noise
The series of C04 mini power pack is supplied with:
• Wide range of kit for the installation of the main electric motors available on the market
• Connections to valve blocks normalized according to the main standards on the market (special versions are available)
• Max. flow regulator device to mechanically reduce pump max. displacement
• Different types of devices for hydraulic, electric and load sensing control for flow rate and / or pressure
• Different types of seals depending on the type of fluid and operating temperature
What makes the Berarma C04 series mini power packs a unique product of its kind?
• The integration of a variable displacement pump in a mini power pack
• 210 bar operating pressure
• Compact dimensions and standard formats that allow the replacement of mini power packs equipped with external gear pumps
• New functional concept of the pressure compensator device (reduction of peak pressure values and response times)
Definition of pump components
(1) Body
(2) Rotor shaft
(3) Vanes
(4) Stator ring
(5) Distributor plates
(6) Control piston
(7) Flow regulator piston
(8) Flow regulator device
(9) Pressure regulator device
5
9
4
7
8
6
1
2
3
3
For the installation and start-up of Berarma pumps please refer to related
Document USE AND MAINTENANCE MANUAL available on
our website.
Technical data
Size
04
Geometric displacement according to ISO 3662 (cm
3
/r)
8
Actual displacement (cm
3
/r)
Due to manufacturing tolerances, the value can vary by approx. ±3%
8,4
Maximum working pressure (bar)
Pressure peak exceeding 30% of the maximum operating pressure must be eliminated by adopting
the appropriate measures
210
Pressure setting range (bar)
20 ÷ 210
Permitted maximum drain port pressure (bar)
1
Inlet pressure (bar)
0.8 ÷ 1.5 absolute
Speed range (rpm)
350 ÷ 2000
for high speed, it’s important to correctly size the inlet line to maintain
the inlet pressure in the range (see above) and avoid cavitation
Rotation direction
right (clockwise) viewed from shaft end
Load on drive shaft
NO RADIAL OR AXIAL LOADS ALLOWED
Hydraulic fluid
for other fluids please contact Berarma technical sales service
HM according to ISO 6743-4
HLP according to DIN 51524-2
HEES according to ISO 15380
FPM-Viton seals ÷ Pmax 160bar
HFD according to ISO 12922
FPM-Viton seals ÷ Pmax 160bar
HFC according to ISO 12922
water <40% ÷ NBR seals ÷ Pmax 100bar ÷ Vmax 1000rpm ÷ Temp. <40°C
Viscosity range (cSt, mm²/s)
22 ÷ 68 at operating temperature
Starting viscosity under full flow conditions (cSt, mm²/s)
400 max.
Viscosity index according to ISO 2909
100 min.
Inlet fluid temperature range (°C)
+15 / +60 ÷ pay attention to viscosity range
Maximum acceptable fluid contamination level
20/18/15 according to ISO 4406
CLASS 9 according to NAS 1638
Recommended fluid contamination level for a longer pump working life
18/16/13 according to ISO 4406
CLASS 7 according to NAS 1638
Moment of inertia (kgm
2
)
0.000028
Weight single pump (kg)
S control
4.7
R control
5.1
D control
5.4
LR control
5.4
LD control
5.7
For further information and/or different operating conditions please contact Berarma technical sales service
Installation and start-up
4
Ordering code
Series
Name
Displacement
Manifold type
Seals
Pressure-flow
controls
Options
C04 -
8
A
N
LR
Omit
Code
Displacement
8
8 cm
3
/r
Code
Manifold type
A
Manifold type A
Code
Seals
N
NBR
V
FPM – Viton
Code
Pressure-flow controls
S
Single stage of pressure
R
Single stage of pressure with remote control
D
Two stages of pressure
LR
Load Sensing control with remote control possibility
LD
Load Sensing control with two stages of pressure
Code
Options
Omit
No option
xxx
Indicate pressure-flow settings to be carried out in full
Ordering code examples:
• C04-8 A N S
• C04-8 A V S
• C04-8 A N R
• C04-8 A N D
• C04-8 A N LR
• C04-8 A V D setted to 65bar MIN and 190bar MAX
• C04-8 A N S limited to 5cm
3
/r
5
Characteristic curves
Indicative values measured on Berarma test stand, referring to 1500rpm with HM hydraulic oil according to ISO 6743-4, ISO VG 46 according to
ISO 3448, temperature 40°C. Sound level meter placed 1 meter from the pump with flexible coupling.
Warning
All Berarma pumps have been carefully checked during manufacture and subjected to testing cycles before shipment.
To achieve optimum performance, avoid problems and maintain the warranty, Document USE AND MAINTENANCE MANUAL, available on our
website, must be strictly observed.
Notes
Before selection and/or use of any Berarma product, it is important that the purchaser carefully analyses all aspects of its application and reviews the
information in the current Berarma technical sales documents. Due to the many different operating conditions and applications for Berarma products, the
purchaser, through their own analysis and testing, is solely responsible for making the final selection of the products and assuring that all performance
and safety requirements are met. Berarma S.r.l. accepts no responsibility for any editing mistakes in this catalogue. Berarma S.r.l. reserves the right to
modify the products and data contained in this catalogue at any time and without prior notice.
Pressure (bar)
Flow-rate (l/min)
Pressure (bar)
Pressure (bar)
Noise level [dB(A)]
Drain flow with q
zero (l/min)
Power consumption (kW)
q max
q zero
q max
q zero
Pressure (bar)
6
Overall dimensions
C04-8 Manifold “A” and Control “S”
Ports
Inlet – 3/8" Gas BSP Model code and serial number
Drain – 1/4" Gas BSP Check valve – SAE 08 housing
Tank attachment – N°8 M6 holes Pressure gauge – 1/4" Gas BSP – Normally plugged
Outlet “P” – 1/4" Gas BSP Output to heat exchanger – 1/4" Gas BSP – Normally plugged
Return “T” – 1/4" Gas BSP Return from heat exchanger – 1/4" Gas BSP – Normally plugged
Valve blocks attachment – N°2 M8 holes Support fixing holes – N°2 M10 holes
1
2
3
4
5
6
2
1
9
8
10
12
11
3
8
9
7
7
1
2
3
4
5
6
7
8
9
10
11
12
7
Different kits are available and consisting of flange and coupling to connect IEC – B14 standard electric motors.
Motor coupling kit
Motor size IEC - B14
Dimension “X”
Ordering code
M71
20mm
3300002071
M80
22mm
3300002080
M90
32mm
3300002090
M100
58mm
3300002100
M112
58mm
3300002100
For further information see related documentation on Berarma website or contact Berarma technical sales service
8
Standard configuration with drain flow direct to the tank
Configuration with drain flow on external heat exchanger
Heat exchanger
C04 mini power pack are pre-arranged with the drain port on the pump and positioned inside of the tank (relevant piping must be installed – not
supplied). Variable displacement pumps drain flow is the hottest fluid leaving the pump and, if necessary, can be conveyed through a properly sized
heat exchanger before the fluid returns to the tank.
If the work cycle and / or the small quantity of oil in the tank require the installation of an external heat exchanger, it is possible to do so by changing the
standard configuration. In the C04 mini power pack there are 2 connections to convey the drainage flow externally and to bring it back into the tank after
being cooled (relevant piping must be installed - not supplied).
Heat
exchanger
Tank
Tank
9
S control
Single stage of pressure
This control enables the pump displacement to be adjusted (until zero flow setting condition) according to
the flow rate required by the hydraulic system, keeping the working pressure constant and equal to the
value set on the compensator device.
The pressure value setting of the compensator device is adjusted by means of the pressure setting screw
and locked using the locknut.
For further information see related documentation on Berarma website or contact Berarma technical sales service
10
R control
Single stage of pressure with remote control
The function of this control is the same as the S control with the possibility of adjusting the working
pressure by means of an additional maximum pressure relief valve (not supplied) installed in a remote
position, far from the pump.
Control performances depends on the additional valve type (not supplied) and on its distance from the
pump.
To obtain the best performance, it is recommended to use maximum pressure relief valves with flow rates
from 2 to 5 l/min and not to exceed 5 meters of pipe length.
Ports
Remote control – 1/4" Gas BSP
For further information see related documentation on Berarma website or contact Berarma technical sales service
1
1
1
MIN
MAX
11
D control
Two stages of pressure, both adjustable
The function of this control is the same as the S control with the possibility of switching two levels of
working pressure, both adjustable.
Switching from low to high pressure occurs by sending a 24VDC electrical signal to the coil of the ON-
OFF valve on the control block.
Ports
Pressure switching coil – Connection DIN 43650 type A – Power supply 24VDC
For further information see related documentation on Berarma website or contact Berarma technical sales service
1
1
1
MIN
MAX
12
LR control
Load Sensing control with single stage of pressure and remote control possibility
The Load Sensing control system adds to the S control the possibility to regulate the pump flow-rate
according to the pressure difference Δp measured before and after a throttle valve. The pilot pressure of
the Load Sensing compensator device is taken from the pump outlet line after throttle valve (not
supplied) and before the actuators. Changing the position of the throttle valve, with a fixed pressure drop
equal to the differential pressure Δp value, the Load Sensing system automatically adjusts the pump
displacement independently of pressure variations that occur in the hydraulic system. The Load Sensing
control produces a notable reduction in displaced power and is recommended for use in applications
where there are significant variations in torque (force) and speed. When the throttle valve is completely
closed, the pump will be in zero flow condition, keeping the working pressure constant and equal to the
differential pressure Δp value. This control also provides the possibility of adjusting the working pressure
by means of an additional maximum pressure relief valve (not supplied) installed in a remote position,
far from the pump. Control performance depends on the type of throttle valve (not supplied), additional
valve type (not supplied) and on the length/ dimensions of signal pipes. To obtain the best
performance, it is recommended to use maximum pressure relief valves with flow rates from 2 to 5 l/min
and not to exceed 5 meters of pipes length.
Ports
Load Sensing – 1/4" Gas BSP
Remote control – 1/4" Gas BSP – Normally plugged
For further information see related documentation on Berarma website or contact Berarma technical sales service
1
2
1
1
2
2
MAX
MIN = Δp
13
LD control
Load Sensing control with two stages of pressure, both adjustable
The function of this control is the same as the LR control with the possibility of switching two levels of
working pressure, both adjustable.
The MIN pressure setting is equal to the Δp value of the Load Sensing control therefore, to save energy, it
is advisable to keep it at low values (20bar).
Switching from low to high pressure occurs by sending a 24VDC electrical signal to the coil of the ON-
OFF valve on the control block.
Control performances depends on the type of throttle valve (not supplied) and on the length /
dimensions of Load Sensing signal pipe.
To obtain the best performance, it is recommended to not to exceed 5 meters of pipe length.
Ports
Load Sensing – 1/4" Gas BSP
Pressure switching coil – Connection DIN 43650 type A – Power supply 24VDC
For further information see related documentation on Berarma website or contact Berarma technical sales service
1
2
1
2
1
2
MIN = Δp
MAX
14
Settings
Pressure
Berarma C04 mini power pack can be equipped with different types of hydraulic pressure devices, through which it is possible to adjust the maximum
working pressure of the pump. By screwing clockwise, the pressure increases.
Warning
Do not go out of the pressure setting range. In the R and LR controls, do not tamper the MIN pressure setting.
In the LD control, the MIN pressure setting is equal to the Δp value therefore, to save energy, it is advisable to keep it at low values (20bar).
Flow rate
All Berarma mini power packs are equipped
with a flow regulator device that allow the
mechanical reduction of the maximum pump
displacement compared to the nominal value.
By screwing clockwise, the flow rate decreases.
Warning
*There is no lock on the minimum displacement. Loosening the flow rate adjustment nut may cause oil to leak.
If the flow regulator device is set to less than 50% of the nominal displacement, the pump can only start on condition that the system and pump are
completely filled with fluid.
Pump type
Actual displacement
(cm³/r)
Reduced displacement
by screw turn (cm³/r)
Minimum
displacement (cm³/r)
C04 - 8
8.4
5.3
*
Indicative values influenced by manufacturing tolerances
Pressure setting and
locking 13mm
MIN pressure setting and
locking 13mm
(only on D and LD controls)
MAX pressure locking
10mm
Flow-rate locking 17mm
Flow-rate setting 5mm
S control
R, D, LR, LD controls
MAX pressure setting
3mm
Flow-rate locking 17mm
Flow-rate setting 5mm