In a pressure controller for adjusting a pressure in a container connected downstream of the pressure controller and in fluid communication therewith, the pressure controller includes a main fluid duct having a fluid input and a fluid output leading to the container and a control valve for adjusting a fluid pressure at the fluid output, a bypass duct branching off from the main fluid duct downstream of the control valve, configured for venting of the main fluid duct, and a flow cross-section of the bypass duct being smaller than a maximum flow cross-section of the main fluid duct.