Fluid circulation pump

Claim 1

A FLUID CIRCULATION PUMP ASSEMBLY OF THE TYPE WHEREIN THE ROTOR OF THE ELASTIC MOTOR DRIVING THE PUMP IMPELLER IS LOCATED IN A ROTOR COMPARTMENT ENCLOSED BY A TUBE MEANS COMPRISING, IN COMBINATION, A PRESSURE COMPARTMENT, A PUMP IMPELLER AND A PUMP SHAFT FOR SAID PUMP IMPELLER LOCATED IN SAID PRESSURE COMPARTMENT, ELASTIC PARTITION WALL MEANS FOR SEPARATING SAID PRESSURE COMPARTMENT FROM THE ROTOR COMPARTMENT, SAID ELASTIC PARTITION WALL MEANS HAVING A RADIAL INNER MARGINAL PORTION, A SEALING RING CARRIED FOR ROTATION BY SAID PUMP SHAFT, A SPRING-LOADED SEALING RING BIASED AXIALLY AGAINST SAID ROTATABLE SEALING RING AND ADAPTED TO ENCIRCLE THE PUMP SHAFT WITH PLAY CARRIED BY SAID RADIAL INNER MARGINAL PORTION OF SAID ELASTIC PARTITION WALL MEANS, SAID ELASTIC PARTITION WALL MEANS HAVING A RADIAL OUTER MARGINAL PORTION, A SHORT PERIPHERAL SECTION OF SAID RADIAL OUTER MARGINAL PORTION OF SAID ELASTIC PARTITION WALL MEANS BEING CONSTRUCTED AS COUNTER VALVE MEANS, SAID OUTER MARGINAL PORTION OF SAID ELASTIC PARTITION WALL MEANS WITH THE EXCEPTION OF THE SHORT PERIPHERAL SECTION BEING RETAINED STATIONARY WITH RESPECT TO SAID ROTOR COMPARTMENT, SAID COUNTER VALVE MEANS OPERATING IN A MANNER THAT THE LATTER IS OPENED UPON THE PRESENCE OF A PRESSURE DIFFERENCE WHICH WORKS IN OPPOSITE DIRECTION FROM THAT DIRECTION WHICH CAUSES BOTH OF SAID SEALING RINGS TO SEPARATE FROM ONE ANOTHER.