Valve assembly for an injection valve and injection valve

摘要

A valve assembly for an injection valve has a valve body with 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 needle preventing a fluid flow in a closing position and releasing the fluid flow via a main fluid line in further positions, a member being fixedly associated to the needle and having a surface facing the outlet portion, a first chamber embodied in the cavity, a second chamber being part of the main line, and a one-way-valve which is hydraulically arranged between the first and second chamber to prevent a fluid flow through a first fluid path in a closing position of the one-way-valve and to release a fluid flow through the first fluid path between the first and second chamber in further positions of the one-way-valve.

主权项

1. A valve assembly for an injection valve, 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 fixedly coupled to or formed integral with the valve needle and having a surface facing the fluid outlet portion, wherein the surface of the member abuts a first chamber defined in the cavity, wherein a portion of the fluid line defines a second chamber, and a one-way-valve hydraulically arranged between the first chamber and the second chamber and configured 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, wherein the one-way-valve comprises a spring and a closing body, wherein the spring is arranged axially between the surface of the member and the closing body and provides a force acting to bring the closing body into contact with an inner surface of the valve body.