Valve assembly for an injection valve and injection valve

An injection valve for a combustion chamber of a combustion engine comprising a valve assembly comprising:

• a valve body comprising a central longitudinal axis and a cavity with a fluid inlet portion and a fluid outlet portion,
• a valve needle axially movable in the cavity, the valve needle preventing a fluid flow through the fluid outlet portion in a closing position and releasing the fluid flow via a main fluid line from the fluid inlet portion to the fluid outlet portion in further positions,
• a member being fixedly associated to the valve needle and having a surface facing the fluid outlet portion,
• a first chamber embodied in the cavity with the surface abutting the first chamber,
• a second chamber being part of the main fluid line, and
• a one-way-valve being hydraulically arranged between the first chamber and the second chamber and being designed to prevent a fluid flow through a first fluid path between the first chamber and the second chamber in a closing position of the one-way-valve and to release a fluid flow through the first fluid path between the first chamber and the second chamber in further positions of the one-way-valve.

A method of operating a valve assembly for an injection valve, comprising the steps:

• providing a valve body comprising a central longitudinal axis and a cavity with a fluid inlet portion and a fluid outlet portion,
• arranging a valve needle axially movable in the cavity, the valve needle preventing a fluid flow through the fluid outlet portion in a closing position and releasing the fluid flow via a main fluid line from the fluid inlet portion to the fluid outlet portion in further positions,
• fixedly associating a member to the valve needle wherein the member has a surface facing the fluid outlet portion,
• arranging a first chamber embodied in the cavity with the surface abutting the first chamber,
• arranging a second chamber being part of the main fluid line, and
• hydraulically arranging a one-way-valve between the first chamber and the second chamber wherein the one-way-valve prevents a fluid flow through a first fluid path between the first chamber and the second chamber in a closing position of the one-way-valve and releases a fluid flow through the first fluid path between the first chamber and the second chamber in further positions of the one-way-valve.