Abstract:
An electric high-voltage apparatus such as an electron accelerator or the like includes a tank having a wall and a tank access located in the wall for making the interior of the tank accessible. An electrical discharge vessel is disposed in the tank and contains replaceable parts. The vessel has a wall and is insulatingly spaced from the tank wall. A vessel access is located in the vessel wall for making the replaceable parts accessible. A tube-like air lock device having a longitudinal axis is movable in the tank transversely to this axis from a given rest position to an operative position located between the tank access and said vessel access. The device includes expansion structure for defining a gas-tight passage between the vessel access and the tank access when the device is in the operative position thereof.