Fluid-conveying device with valves for controlling the fluid flow

A fluid-conveying device configured to convey a fluid from a tank along a dosing line to an injection point by a pump, wherein the dosing line is attached at a pressure side of the pump by a connection plug attached to an outlet line, comprising:

• at least one first valve preloaded by a spring and configured to:
• prevent a fluid flow from the dosing line to the outlet line and
• permit the fluid flow from the outlet line to the dosing line if a predefined minimum pressure p1 is reached on that side of the at least one first valve that faces toward the outlet line opening;
• and
• a second valve configured to allow a fluid flow from the dosing line in a direction toward the outlet line only if a second pressure p2 acts on the second valve from the side of the dosing line,
• wherein the predefined minimum pressure p1, at which the at least one first valve opens, is lower than the second pressure p2, at which the second valve opens.