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Hydraulics glossary
12 entries (growing to ~40): short, precise, quotable definitions.
- Compact hydraulic power pack
- A compact unit that generates hydraulic power: it integrates electric motor, pump, reservoir, manifold and valves in a single block, powering cylinders and actuators on machines and vehicles.
- Hydraulic power unit (HPU)
- A larger hydraulic power system, custom-engineered for higher flows, pressures and complex control logic, often serving multiple actuators with heat exchangers.
- Manifold
- An aluminium or cast-iron block on which pump and valves are mounted: it contains the galleries that distribute oil, eliminating most piping.
- Flow rate
- Oil volume moved per unit of time (l/min). It determines actuator speed and equals pump displacement × rotation speed.
- Working pressure
- The pressure (bar) at which the circuit operates in nominal conditions; it determines the force available at the actuators.
- Displacement
- Oil volume moved by the pump per revolution (cm³/rev). Together with motor speed it defines the flow rate.
- Pressure relief valve
- A safety valve that limits maximum circuit pressure by discharging excess oil to the reservoir.
- Solenoid valve
- A valve operated by an electric coil that routes oil flow; in compact packs it is typically NG6/CETOP 3 interface or cartridge type.
- S1 / S3 duty
- Electric motor duty classification: S1 = continuous duty, S3 = periodic intermittent duty (working percentage over a 10-minute cycle).
- NG6 / CETOP 3
- International standard for directional valve mounting interfaces: it guarantees interchangeability between manufacturers.
- Coil
- The electromagnetic winding that operates a solenoid valve; available in several voltages (12/24V DC, 24/110/230V AC) with standard DIN 43650 connectors.
- Suction kit
- The strainer, filter and fittings that carry oil from reservoir to pump; it must be sized to flow rate and reservoir type.
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