Device for storing and releasing energy

A device for the storing and releasing of energy comprising:

• a high pressure accumulator,
• a low pressure accumulator,
• a hydraulic transducer adapted for connection with a system intermittently
• supplying and utilizing energy,
• a switch over device for causing charging and discharging of the high pressure accumulator from and into the low pressure accumulator with the aid of said hydraulic transducer through a first circuit path in one direction and through a second circuit path in the opposite direction,
• electrical means and shut off valves for shutting off one of the circuit paths and opening up the other and vice versa,
• two first parallel-connected 2/1 way shut off valves associated with the high pressure accumulator,
• two second parallel-connected 2/1 way shut off valves associated with the low pressure accumulator, first ports of said four 2/1 way shut off valves being connected with a feed line leading to the respective accumulator, second ports of two such 2/1 way shut off valves associated with each accumulator being connected with a power input of the hydraulic transducer, second ports of the respective other 2/1 way shut off valves being connected with the power output port of the hydraulic transducer,
• and means for paired switching of a respective one of the two 2/1 way shut off valves associated with one of such accumulators so that a selected one of the two accumulators is connected with the power input of the hydraulic transducer and the switching path is able to be built up from the power output of the hydraulic transducer to the other accumulator.