The invention provides a trigger dispenser device for a liquid. The trigger dispenser device for a liquid provides an integral valve element (2) comprising a suction duct (8) and at least one flexible suction lip (10a) to obstruct the suction duct during the dispensing phase, and an annular obturator (18) and a flexible flange (19) supporting it, for opening the pressure chamber (24) toward the dispenser duct (30) during the dispensing phase.