Hydraulic Power Unit

1 Location
Clear description of the power pack's working environment.
2 Working conditions
Power pack cycle example (service character).
3 Working pressure p [bar]
Duty cycle description - time / pressure diagram.
4 Flow rate Q [l / min]
The flow rate required to achieve the required velocities and cycles.
5 Pump type
It will be determined after the evaluation of the above points.
The following pumps are available: - gear pumps
- variable piston pumps
6 Pump displacement
See item 7.
7 Electric motor
The required flow rate and pressure, the relative displacement of the pump as well as the power and speed of the electric motor will be determined from Tables 1 to 5. These data will be put into the survey together. Network voltage and frequency, enclosure type, climatic endurance, etc. with the information. The tables also include: basic drive dimensions - the total height of the electric motor including the diameter of the flange and the thickness or thickness of the flange damping ring (Figures 2 and 3). The damping rubber ring is normally pierced by variable piston pump drives. Also available with gear pumps on request.
8 Driver placement
Vertical - with all types of gear pumps and pressure-controlled axial piston pumps (Figures 2 and 3).
Horizontal - only for special applications and after consulting with us.

10 Painting
The following are the standard pictures of the outer surface of the tank:
- top coat - RAL 7030 KOMAXIT (stone gray)
- aluminum parts - without surface treatment
- hydraulic components - manufacturer's standard paint
Other paints or special surface treatments on request.
Component assembly in the tank cover
In addition to the drive unit, also the base block and filtering unit are usually located on the tank cover. Basic block connected
to the pump outlet. It consists of a check valve and pressure valve (or some other component) depending on the pressure control system used.
(See circuit diagrams in Figures 14 to 18). It also allows the connection of other components of the hydraulic circuit, such as:
- Oil filter
- subplates or link plates with relevant components
- accumulator

11 Pressure control
- Pressure relief valve VT (Fig. 14) - used with all types of gear pumps.
- Drain valve VO (Fig. 15) - used in conjunction with gear pump, accumulator and check valve. When the pressure is set
When the discharge valve is reached, the valve loads the pump. The accumulator allows to keep pressure in the circuit behind it.
check valve. The pressure valve VP acts as the safety valve of the accumulator.
- Switching (Fig. 16) - used in conjunction with gear pump, accumulator, check valve and TS pressure switch. When pressure
reaches the pressure set in the system pressure switch, the relevant circuit turns off the electric motor.
The accumulator holds the pressure in the circuit behind the check valve. The pressure valve VP acts as the safety valve of the accumulator.
- Remote control with VT pressure relief valve (Fig. 17) - used only on pressure controlled piston pumps. Pressure valve protects VP
Circuits against pressure peaks.
- Pressure valve on the pump - used in pressure controlled piston pumps. The pressure is adjusted with the screw fixed to the pump.
The pressure valve VP protects the circuit against pressure peaks.
12 Oil filtration
Preferably, visual (Figure 8) or electrical (Figure 9) return line filters with occlusion indicator are used. These filters can also be used (after removal)
cover) as filling filters. Usually they also include an integrated air release.

14 Control voltage
The control voltage of electro-hydraulic components should be determined according to safety and health protection. On request, components with the following DC control voltages are available: 12, 14, 21, 24, 42, 48, 60, 102 and 205 V. Available AC voltages are 24, 115 and 230V / 50 (60) Hz.
15 Accumulators
Gas bladder or membrane accumulators are used (Figure 10). Required capacity in liters will be determined. Preferably, accumulators from suppliers that can provide international certification (at least German Test Laboratory certification) are used. When filling out the form, please indicate which country your machine with our power pack will be used in The accumulator is a pressurized tank that must comply with occupational safety regulations. These regulations differ from country to country. The accumulator must be given the certificate of the country in which it will be used! Smaller accumulators (up to 4 l) are mounted directly on the lid of the tank or in a short block (with max. 2 control component sections above the base block). Larger accumulators are mounted on the tank cover only. Filling and checking equipment can be delivered with an accumulator (including pressure gauge for filling the accumulator with nitrogen). We recommend the use of an accumulator to discuss with our technicians.

16 Accumulator block
The function of the safety block is provided by the base block (see Figs. 15 and 16). The use of another block will be discussed with us.
17, 18 Thermometer, thermostat, oil level converter These tools can be mounted on the tank cover. Thermometer (Fig.11) and thermostat (Fig.12) check oil
temperature. The oil level converter (Figure 13) shows the oil level in the tank.

19 Electrical equipment
Power packs delivered without electrical equipment are standard. The electrical circuit diagram of the electric motor is at the bottom of the motor terminal box cover. Electrical boxes (including terminals, circuits, breakers etc.) can be delivered upon request.
20 Hydraulic fluid
Hydraulick power packs are designed to work with mineral oils of HM and HV power classes according to European standards. With biodegradable hydraulic fluids of HTG and HE groups according to specification CETOP-RP 91 H and DIN proposal.
21 Special equipment
Oil cooling and heating, power pack coating, etc. Special requirements regarding power pack equipment such as, will be consulted by our technicians.