Device for storing and delivery of a liquid and/or gaseous medium under pressure, as well as a fuel energy conversion device and method for assembling a device for storing and delivery of a liquid and/or gaseous medium under pressure

A fuel energy conversion device, comprising:

• a fuel cell unit;
• at least a medium connecting line;
• at least a pressure reducer;
• and
• at least a device, comprising:
• a medium-holding medium container made of a plastic material;
• at least one valve connecting element connected with the medium container;
• at least one valve element that can be connected with the valve connecting element;
• wherein the medium container is integrally formed with a collar protruding from the medium container and having a collar outer wall and a collar inner wall;
• wherein an end of the collar defines a free cross-section of an opening of the medium container;
• wherein the valve connecting element is arranged in an area of the opening, while a section of the collar outer wall is arranged opposite a section of a wall of the valve connecting element;
• wherein the valve element has a pressing section that lies opposite a section of the collar inner wall in an assembled state of the device;
• wherein, between the section of the wall and the pressing section, there is at least one restoring element that is arranged such that, upon assembly of the valve element, the collar and the restoring element are pressed together between the section of the wall and the pressing section;
• wherein the restoring element is made of a cross-linked plastic material;
• wherein the pressing section, the collar and the restoring element are matched and formed such that the joint pressing of the collar and the restoring element causes an elastic deformation of the restoring element, that is larger than a maximum creep deformation of the collar over a service life of the device;
• wherein the creep deformation of the collar is compensated by the restoring element and is compensated between the pressing section, the collar, the restoring element and the section of the wall;
• wherein the medium connecting line connects the device with the fuel cell unit, and the pressure reducer is arranged in a medium flow direction upstream of the fuel cell unit.