Manually operated liquid dispenser device, for example trigger-operated, comprising: a container provided with a neck and having an inner compartment to contain the liquid to be dispensed; a dispenser head attachable to the neck comprising a frame in which a pressure chamber is made; a manually activated piston, sealably sliding in the pressure chamber between an initial rest position, wherein the volume of the pressure chamber is maximum, and a limit dispensing position, wherein the volume of the pressure chamber is minimal; a dispenser duct suitable for being placed in communication with the pressure chamber for transit of the liquid being dispensed; an integral valve element, applicable to the frame and/or to the neck of the container, comprising: A) a suction duct and at least one flexible suction lip suitable for obstructing said suction duct, to realise valve suction means suitable to permit the transit of liquid from the inner compartment to the pressure chamber during a suction phase and suitable to prevent the return of the liquid from the pressure chamber to the compartment during a dispensing phase; said integral valve element being characterized in comprising B) an annular obturator positioned radially externally to the suction duct and a flexible flange projecting radially externally to the suction duct, which supports said obturator, to form valve dispenser means suitable for allowing the transit of liquid from the pressure chamber to the dispenser duct during the dispensing phase and suitable to prevent the return of the liquid from the dispenser duct to the pressure chamber during the suction phase. a container provided with a neck and having an inner compartment to contain the liquid to be dispensed; a dispenser head attachable to the neck comprising a frame in which a pressure chamber is made; a manually activated piston, sealably sliding in the pressure chamber between an initial rest position, wherein the volume of the pressure chamber is maximum, and a limit dispensing position, wherein the volume of the pressure chamber is minimal; a dispenser duct suitable for being placed in communication with the pressure chamber for transit of the liquid being dispensed; an integral valve element, applicable to the frame and/or to the neck of the container, comprising: A) a suction duct and at least one flexible suction lip suitable for obstructing said suction duct, to realise valve suction means suitable to permit the transit of liquid from the inner compartment to the pressure chamber during a suction phase and suitable to prevent the return of the liquid from the pressure chamber to the compartment during a dispensing phase; said integral valve element being characterized in comprising B) an annular obturator positioned radially externally to the suction duct and a flexible flange projecting radially externally to the suction duct, which supports said obturator, to form valve dispenser means suitable for allowing the transit of liquid from the pressure chamber to the dispenser duct during the dispensing phase and suitable to prevent the return of the liquid from the dispenser duct to the pressure chamber during the suction phase. A) a suction duct and at least one flexible suction lip suitable for obstructing said suction duct, to realise valve suction means suitable to permit the transit of liquid from the inner compartment to the pressure chamber during a suction phase and suitable to prevent the return of the liquid from the pressure chamber to the compartment during a dispensing phase; said integral valve element being characterized in comprising B) an annular obturator positioned radially externally to the suction duct and a flexible flange projecting radially externally to the suction duct, which supports said obturator, to form valve dispenser means suitable for allowing the transit of liquid from the pressure chamber to the dispenser duct during the dispensing phase and suitable to prevent the return of the liquid from the dispenser duct to the pressure chamber during the suction phase.