A valve device for use in a ventilation system

Abstract

A valve device for use in a ventilation system. The valve device comprises: a base (44, 46) configured to connect to a pipe and an airflow guide (50) directed toward the base. The base has an inner wall (66) with a variable diameter that decreases from an initial value (R1) on the pipe to a minimum value (R2) and then increases to a maximum value (R3) on the output side. The airflow guide is substantially bell-shaped in cross-section with a top directed towards the base. A hypothetical disc (5) positioned at the constriction of the inner wall intersects the airflow guide in an intersection line (74). Providing such a constriction ensures a concentration of the flow near the top of the airflow guide, while the placement of the top prevents the concentrated air from colliding directly with it. These effects together ensure an improved air flow over the valve device.

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