the invention relates to a device for injecting a fluid , which is at high pressure , through an injection nozzle and an externally actuated actuating device received with prestressing on a pump element . in the pump element , a control element triggerable by a magnetic actuator is received , with which high - pressure lines can be made to communicate with one another . the control element is assigned two spring means , which generate a closing force that on the high - pressure side closes the control edge of the switchable control element and / or open a control edge to a low - pressure chamber .