Closure cap provided with anti-twisting

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;
• a guidance element;
• and
• 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, wherein:
• said guidance element is provided between said valve body and said coupling insert, one end of which adjoins said valve body and the other end of which adjoins 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;
• said coupling insert and the end of said guidance element which faces said coupling insert have mutually adjoining fingers which engage in axial recesses of said locking element;
• and
• said fingers of said guidance element push said axially inward-directed fingers of said coupling insert out of said recesses in said locking element, and continues to effect pushing until said guidance element strikes said locking element.