Internal protective device for the ear

摘要

The valve (2) is positioned between at least one of an outward-leading ventilation and sound duct (5a,5b) and a central duct (7) leading to the inside. The entry to the central duct is in the form of a valve seating (2b) for the valve body (2a) which is adjustable from outside by of an adjusting screw (3). The valve seating is in the form of a cylindrical hole in which the cylindrical pin constituting the valve body leads. At least one axially pointing groove which increases in cross-section towards the inside provides free access for the axial adjustment of the pin to the hole. A collector area (6) is positioned between the outlet of the ventilation and sound duct and the inlet to the central duct.