Trigger dispenser device with a venting valve

A trigger dispenser for a liquid, comprising:

• a bottle;
• a trigger dispensing head mounted on the bottle, comprising:
• a frame comprising an annular spacer wall which defines a main axis and internally delimits a compartment;
• a separation wall which cooperates with the annular spacer wall to close at least partially the compartment, wherein the separation wall is crossed by a vent passage, the compartment being in communication with the external environment through the vent passage;
• a trigger, rotatably or translatably engaged with the frame;
• a bulb coupled to the separation wall, comprising an elastically deformable casing which, together with the separation wall, delimits a pressure chamber;
• a dispensing duct in communication with the pressure chamber to dispense the liquid outwards;
• a coupler for stable coupling of the bulb to the separation wall, the coupler comprising an attachment rim arranged at one axial end edge of an auxiliary wall and said coupler further comprising a plurality of attachment fins angularly spaced and disposed circumferentially along the axial end edge of the auxiliary wall;
• wherein the bulb comprises a vent lip, molded in one piece with the casing, the vent lip sealingly closing the vent passage to form a venting valve;
• wherein each of the attachment fins has a foot, coupled to the auxiliary wall, and an enlarged portion that forms a bulge with respect to the foot, projecting radially internally;
• wherein the attachment fins interfere with the bulb by the enlarged portion and form a stable coupling to the separation wall on an imaginary plane perpendicular to the main axis.