Control valve, in particular for metering in a fluid for a delivery pump which is arranged downstream

摘要

A control valve is provided, in particular for metering in a fluid for a delivery pump which is arranged downstream. The control valve has a flow channel, an axially movable valve needle, and a valve element which can be loaded by the valve needle in an opening direction and is arranged in the flow channel. If the valve element is actuated in the opening direction by the valve needle, the fluid can flow back through the flow channel at least temporarily counter to the opening direction of the valve element. Upstream of the valve element as viewed in the backflow direction, the flow channel has a fluidically active shield which keeps the backflow at least partially free of a face of the valve element.

主权项

1. A control valve, in particular for metering a fluid for a delivery pump arranged downstream, having a housing, a flow channel defined by the housing, an axially movable valve needle, and a valve element that can be urged in an opening direction by the valve needle and is disposed in the flow channel, and when the valve element is actuated in the opening direction by the valve needle, the flow channel can at least temporarily experience a backflow of the fluid through it counter to the opening direction,
wherein a fluidically active shield is positioned to keep the backflow at least partly away from a face of the valve element, a fuel-filled fluid chamber being defined radially within the shield, the chamber being in fluid communication with the flow channel through a connector channel, and wherein the flow channel gradually narrows in cross-section in the backflow direction to a throttle restriction positioned at the connector channel between the flow channel and the fuel-filled fluid chamber within the shield.