Hydraulic accumulators, nominal values 13, 40 and 75 cm³

Hydraulic accumulators, nominal values 13, 40 and 75 cm³

When using hydraulic clamping systems, internal leaks and volume changes (e.g. because of temperature fluctuations) must be balanced. These tasks are performed by the hydraulic accumulator. 


In intermittent applications, the attached pressure generator fills the hydraulic accumulator during the interruptions. As a result, a short-term high volume flow is achieved, which can be used, as required, to reduce power at the pressure generator. 


As volume storage, the hydraulic accumulators are also suitable as a source of pressure oil upon failure of the pressure oil supply at the hydraulic pump. 


Balancing internal system leaks 


In hydraulic clamping systems, the pressure generator usually operates in off mode. A pressure switch thereby controls the switching operations of the drive motor. 


If elements that cause a leak due to their construction are connected 

to the system (e.g. rotary valve coupling), this causes frequent switching.

The hydraulic accu-mulator substantially reduces the on and off cycles

of the drive motor, thus saving energy and reducing wear and tear. 


Balancing volume changes 


In uncoupled clamping systems, temperature fluctuations may arise. 

These will inevitably lead to substantial changes in the clamping pressure 

(± 10 bar at ± 1° C). 


The installation of a hydraulic accumulator in the system equalises volume, thus preventing undesirable fluctuations in pressure.