group picture
group picture

Pump unit

with pressure relief valve
and electronic pressure switch,
single- and double-acting,
max. operating pressure 200 bar.

Article no. Clamping
control unit
327726 6906-61660 1 2,5 4/3 - - - 53
327742 6906-61661 1 2,5 4/3 6906B-2-1 - 61
327635 6906-61661-BZH 1 2,5 4/3 6906BZH-2 2 61
327650 6906-62660 2 2,5 4/3 - - - 56
327676 6906-62661 2 2,5 4/3 6906B-3-2 - 64


Compact, plug-in pump unit, ready for electric and hydraulic operation. Complete with: pressure limiting valve and pressure switch, solenoid valve, pressure gauge, float switch with temperature monitoring, oil fill, electrical control with main switch, indicator lamps and flange sockets. Electrical connection, complete with CEKON connector, pressure filter with filter mesh of 25μm. Oil supply via threaded port.


These pump units are mainly used as drive and control elements for single- and double-acting clamping devices.

Operation type:
Control panel for one and two clamping circuits. Two-hand control panel for only one clamping circuit.


The radial piston pump is driven via an alternating current standard motor with the energy efficiency class IE3. The motor is protected against overload by a motor protection switch and a thermoelement. Pressure setting and pressure monitoring are accomplished via a pressure limiting valve (DBV) and an electronic pressure switch (EDS). The value set at the pressure limiting valve is stored with the Mode button on the pressure switch. This simultaneously sets the preprogrammed switch-off and switch-back point.
- High safety standard through the use of 4/3-way seat valves!
- No unwanted traversing movements. In the event of a loss of power or contact problems, the valve returns to the hermetically sealed centre position.
- Easy activation of external machine controllers (e.g. PLC).
The pump unit works in intermittent mode. In the event of a loss of pressure, the pump is subsequently automatically switched by the pressure switch. In the event of a lack of oil or an increase in oil temperature, the built-in floating switch with temperature monitoring switches the pump off and the fault lamp on the electrical controller lights up.


Ensure that the ventilation is working properly when connecting the elements. In the event of a loss of pressure, subsequent pumping must not exceed a maximum of 2 times per minute. The pump unit must not be allowed to run continuously.

Clamping circuits: For up to 5 clamping circuits, there is an electrical controller. For more than 5 clamping circuits, there is no electrical controller.
Valve combination: Pressure reduction and clamping pressure monitoring in certain clamping circuits. Pressure reduction for all subsequent clamping circuits. Pressure filter with filter mesh 10µm or 40 µm. Throttle valves for specified clamping circuits.

On request:

Directional valves with other function diagrams on request.
Three to five clamping circuits on request.