Patent ID: 7798375

Claim:
Fluid product dispensing pump comprising: a pump body ( 10 ); a pump chamber ( 20 ); at least a first piston ( 72 ) sliding in the said pump chamber ( 20 ) to dispense the fluid product; a dispensing orifice ( 45 ); and a closer ( 38 ) displaceable or deformable between a closing position of the dispensing orifice ( 45 ) and an open position of the dispensing orifice ( 45 ), wherein said pump chamber ( 20 ) comprises an inlet valve ( 70 ) separating the pump chamber ( 20 ) from a dip tube ( 18 ) extending to a reservoir ( 60 ) of fluid product, said inlet valve ( 70 ) comprising an inlet valve seat ( 71 ), and a bypass passage ( 74 ) being provided between the said dip tube ( 18 ) and the said pump chamber ( 20 ), the said bypass passage ( 74 ) being arranged upstream of the said inlet valve ( 70 ), the said bypass passage ( 74 ) being a lateral hole formed in said inlet valve seat ( 71 ), and the said bypass passage connecting the pump chamber ( 20 ) to the dip tube ( 18 ) when the pump is primed.