X-ray apparatus comprising a hydraulic system

An X-ray apparatus which comprises a hydraulic system for counterbalancing and for displacing an apparatus section, said hydraulic system comprising a cylinder with two cylinder chambers whose volumes vary in opposite senses upon displacement of the apparatus section and can be coupled to a hydraulic drive via two respective hydraulic lines such that said apparatus section is displaced against the force of gravity in response to one of the two hydraulic lines being hydraulic line of higher pressure and the other of the two hydraulic lines being a hydraulic line of lower pressure, said hydraulic drive comprising a pump circuit with a forward line and a return line, a control device for connecting, as desired, the forward line to either of the two hydraulic lines, and a valve device via which the two hydraulic lines communicate with the return line, said valve device being loaded by at least one control weight to bias said valve device toward a position in which the hydraulic line of higher pressure is closed relative to the return line but the hydraulic line of lower pressure is open relative to the return line.