Hydraulic pumps, motors, valves and filters
Pumps, hydraulic motors, valves, filters, oil coolers and electric motors: we supply from stock the components we use on our own power units, and design the complete circuit with you.
How to select hydraulic components
Selection starts with the pressure and flow the circuit requires. Pump flow is displacement multiplied by speed: a 10 cm³/rev pump running at 1500 rpm delivers about 15 L/min. Motor power follows from pressure and flow; running the same pump at 200 bar takes twice the power of running it at 100 bar.
A gear pump has fixed displacement, is economical and tolerates contamination; it is sufficient for most general-purpose units. On presses that run at high pressure for long periods and in systems that need variable flow, a piston pump lasts longer. For slow-running, high-torque drives (mixers, conveyors, winches) an orbital hydraulic motor is used instead of a gearbox.
In valve selection the flow and pressure rating matter as much as the mounting style. Modular (CETOP) valves are stacked on a manifold block to build a compact circuit; in-line valves are connected directly to the pipework. Load holding and pilot operated check valves are safety components that keep the cylinder from dropping the load even if a hose bursts, and they must not be left out in lifting applications.
The filter and the cooler are often considered last, yet most hydraulic failures start with dirty and overheated oil. The suction filter protects the pump and the return filter protects the system; if the oil temperature stays high, a cooler is added.
Product groups
Groups with their own page have their types and selection guide there; sizes in stock and manufacturer part numbers are in our catalog.
- Hydraulic pumps →Gear and axial piston pumps, tandem sets; ISO and SAE flange mountings.
- Hydraulic motors →Orbital (gerotor) type, 36-395 cm³/rev displacement; plain, splined and keyed shafts. Direct drive without a gearbox on mixers, conveyors, winches and agricultural machinery.
- Hydraulic valves →Directional control, pressure control, flow (speed) control and check valves; NG6 (CETOP 3) modular valves, in-line load holding and pilot operated check valves.
- Solenoid coils →Replacement coils for valves: 12 and 24 V DC, 110 and 220 V AC.
- Hydraulic filters →Suction filters for 25-750 L/min, tank-top and in-line return filters, complete housings and replacement elements.
- Oil coolers →Oil-air coolers with 12 V, 24 V and 220 V fans; 60-220 L/min capacity.
- Electric motors →0.37-22 kW, 1500 rpm, 220 V single-phase and 380 V three-phase, foot and flange mounted (B35) frame; DC motors for power units.
- Ball valves →Mini and full-bore ball valves and butterfly valves for hydraulic and fluid lines.
A circuit, not a part
Replacing a single valve or pump does not always solve the problem: the cause of the fault is somewhere else in the circuit. We can read the circuit diagram of your existing machine with you, find an equivalent for a discontinued component, or redesign the complete circuit. If you need a ready-built power unit, we assemble the pump, motor, valve manifold and tank in our own workshop and deliver it tested.
Hydraulic power unit manufacturing → Machine and system design →