Patent ID: 7380681

Claim:
A closure cap for a fixed neck of a container, in particular a motor vehicle radiator, having: an outer cap element; an inner cap element, said outer cap element having a closure element for the container neck and a grip element, which can be rotated in relation to the latter; a twist-prevention device which acts between said grip element and said closure element, said inner cap element having a flow connection between the interior of the container and the exterior of the container; a valve arrangement for releasing or blocking the flow connection, which valve arrangement has an axially movable overpressure valve body, which is pressed under initial tension toward the interior of the container against a seal at said inner cap element in such a way that, when a threshold value of the interior container pressure is exceeded, it can be lifted off the seal; an underpressure valve body; and a thermally or pressure-controlled drive mechanism in the form of a capsule made of an expandable material or of a diaphragm, wherein: said twist-preventing element is disengaged by means of said thermally or pressure-controlled drive mechanism; said drive mechanism is arranged in said outer cap element and is provided with a linearly extending transmitting element, which penetrates said overpressure valve body in the cap axis and extends into the area of said inner cap element which is connected with the neck of the container; and said underpressure valve body is arranged concentrically with respect to the cap axis.