Pump with magnetic clutch

The invention is related to a pump, preferably a positive-displacement pump, comprising: a) a rotary drive member ( 1 ) driven at a speed dependent on a speed of a driving motor; b) a casing ( 3 ); c) and a feed wheel ( 5 ) arranged in said casing ( 3 ), said first feed wheel ( 5 ) being coupled to said rotary drive member ( 1 ) for introducing a torque; d) said first feed wheel ( 5 ) forming, with the walls of said casing alone or in conjunction with a second feed wheel ( 6 ), a delivery space ( 7 ) comprising a low-pressure side ( 8 ) connected to a pump inlet port and a high-pressure side ( 9 ) connected to a pump outlet port; wherein: e) limiting delivery of said pump is achieved by using a magnetic clutch ( 11 - 17 ) which couples said rotary drive member ( 1 ) to said first feed wheel ( 5 ) for transmitting said torque; f) an input half ( 11 - 14 ) of said magnetic clutch ( 11 - 17 ) is non-rotatably connected to said rotary drive member ( 1 ), and an output half ( 15 - 17 ) of said magnetic clutch ( 11 - 17 ) is non-rotatably connected to said first feed wheel ( 5 ); g) and said magnetic clutch ( 11 - 17 ) is designed with regard to a limiting torque, such that when said output half ( 15 - 17 ) reaches a speed predefined by the design, it no longer increases, or at least increases more slowly than the speed of said input half ( 11 - 14 ) when said input half ( 11 - 14 ) exceeds said predefined speed, wherein said predefined speed is less than a maximum operating speed of said input half ( 11 - 14 ).