Patent ID: 7913671

Claim:
A flow management device for a venting circuit of a liquid tank provided with a filling tube, which includes a filling head part, and with a canister, this device comprising: a) a control chamber ( 1 , 2 ) that communicates with: the canister via a main orifice (b) and a secondary orifice (c; 17 ) having a smaller flow area than that of the main orifice, these orifices terminating in a ventilation line ( 4 ) leading to the canister; the interior of the tank via the venting circuit; and the filling head via a pressure-equalizing line ( 3 ); b) a closure member (d) that is: provided with an opening (a) that passes right through it and brings the venting circuit into communication with the pressure-equalizing line ( 3 ); able to move in the control chamber ( 1 , 2 ) between an operating position, in which it closes off the main orifice (b) by gravity while leaving the secondary orifice (c; 17 ) free, and a filling position in which both these orifices are free; and shaped such that it sealingly conforms to at least part of the control chamber ( 2 ), said part including the main orifice (b).