Patent ID: 6971533

Claim:
A pressure cap for a fixed neck of a tank in which an operating pressure prevails, the pressure cap defining an axis, comprising: an outer cap component; an inner cap component with a flow connection between the inside and outside of the tank and a sealing seat; a valve arrangement for releasing and blocking said flow connection, said valve arrangement having a vacuum valve body and an axially movable pressure-relief valve body which is pressed toward the inside of the tank against said sealing seat with a bias controlled by the operating pressure, such that when the operating pressure exceeds a threshold value said pressure-relief valve body is lifted off said sealing seat; and a thermal drive, wherein: said bias is adjusted by said thermal drive formed as an expansion-material membrane capsule provided with a temperature sensor, said temperature sensor passing the direction of the pressure cap axis and extends into the neck of the tank; and said vacuum valve body is arranged eccentrically with respect to the pressure cap axis.