Patent ID: 6910603

Claim:
A dispenser pump comprising a lower component ( 11 ) adapted to be fitted to a container for a liquid or pasty substance to be dispensed and an upper component ( 10 ) rotatable relative to the lower component ( 11 ) and having a spout opening ( 15 ) and an air opening ( 22 ), the lower component ( 11 ) comprising a passageway ( 30 ) for communicating the interior of the container with the interior of the upper component ( 10 ), said passageway ( 30 ) controlled by a first non-return valve ( 19 ), characterised in that there is provided an annular discharge compartment ( 31 ) of the lower component ( 11 ) surrounding said passageway ( 30 ), a second non-return valve ( 17 ) permitting discharge of the substance from the interior of the upper component ( 10 ) into said discharge compartment ( 31 ) while preventing the entry of air to the interior of the upper component ( 10 ) from the spout opening ( 15 ) and an obturating element ( 13 ) integral with the lower component ( 11 ) located at and circumferentially interrupting the periphery of the compartment, the arrangement being such that in one angular orientation of the upper ( 10 ) relative to the lower component ( 11 ) the spout opening ( 15 ) and the air opening ( 22 ) are obturated by the obturating element ( 13 ) while in other angular orientations of the upper component ( 10 ) the interior of the upper component ( 10 ) can communicate with the spout opening ( 15 ) through the discharge compartment ( 31 ) and a pathway for air to enter the container provided through the lower component ( 11 ) is in communication with said air opening ( 22 ).