Abstract: Subject of the invention is an eccentric pump with lock valve, mainly for the lubricant circulation of drives, provided with case of inner cylindrical surface fixed with tangential support and having pressure and suction connections, furthermore with shaft sealed and voncentrically embedded leading through the case, liquid chamber closed between the case and the shaft, confined by parallel planes on the side, round eccentric part arranged on the shaft, rectangular sectional ring pressed to the cylindrical inner wall of the case by the eccentric part in a point of contact moving from the pressure connection to the suction connection, as well as a lock valve separating the suction and pressure connections from each other by way of sealing.