Patent ID: 7353965

Claim:
A pressure cap for openings in tanks, in which an operating pressure prevails, the tank defining a neck, the pressure cap comprising: an outer cap component provided with a locking element for connection to the tank neck, a handling element rotatably mounted relative to said locking element, and anti-rotation means provided with a coupling insert, held non-rotatably in said handling element and axially moved back and forth for the releasable anti-rotational connection of said locking element and said handling element; an axial first compression spring; a valve assembly containing a valve body movable back and forth for releasing and blocking flow connections between the inside and outside of the tank as a function of said operating pressure and; a guidance element provided between said valve body and said coupling insert, wherein: one end of said guidance element sits on said valve body and the other end of said guidance element is axially moved relative to said coupling insert, and engages in same; said axial first compression spring is provided between said valve body and said coupling insert; the axial engaging and disengaging movement of said coupling insert is derived from the pressure-dependent axial movement of said valve body; and said guidance element is axially moveable and adapted to be coupled with said coupling insert in the direction of the effect of said axial first compression spring.