Injection system for an internal combustion engine and method for regulating and/or bleeding of said system

An injection system for an internal combustion engine, comprising:

• a pre-feed pump, a high-pressure pump, a high-pressure accumulator and at least one injector, connected to one another via a fuel line, in order to convey fuel out of a fuel tank via the pre-feed pump and the high-pressure pump into the high-pressure accumulator and to inject said fuel out of the high-pressure accumulator via the injector into a combustion chamber of the internal combustion engine,
• a feed for the high-pressure pump, said feed being connected to the fuel line between the pre-feed pump and the high-pressure pump, in order to supply fuel for lubrication and cooling to the high-pressure pump, and
• a valve device connected to the feed, which regulates the fuel stream for lubricating and cooling the high-pressure pump and/or bleeds the injection system, wherein the valve device comprises at least one movably arranged actuator and a first and a second throttle device, the actuator being set as a function of a pressure of the fuel stream between the pre-feed pump and the high-pressure pump, in such a way that a first connection through the first throttle device to the high-pressure pump is released or the feed to the high-pressure pump is interrupted or a second connection through the second throttle device to the high-pressure pump is released.