Trigger dispensing head

A trigger dispensing head applicable to a bottle of a dispensing device for dispensing a product, comprising:

• a cylinder wall having an annular inner surface that extends along and around a chamber axis and delimits a cylinder chamber;
• a sleeve accommodated in the cylinder chamber in a fixed position along the chamber axis, comprising an annular sleeve wall having an outer surface and delimiting a pressure chamber, wherein the sleeve and the cylinder wall at least partially delimit a valve compartment;
• a piston that is translatable in the pressure chamber between an initial rest position and a final end-of-stroke position;
• a suction duct suitable for putting a compartment inside the bottle in communication with the pressure chamber, and a dispensing duct suitable for putting the pressure chamber in communication with an external environment;
• and
• valve means suitable for adjusting a flow of the product from the suction duct to the pressure chamber during a suction step and/or for adjusting a flow of the product from the pressure chamber to the dispensing duct during a dispensing step, and comprising a valve element at least partially housed in the valve compartment, the valve element comprising an annular support wall made of elastically deformable material engaged between the sleeve and the cylinder wall to make a seal against leakage of the product from the valve compartment, wherein
• the annular support wall cooperates with the sleeve and with the cylinder wall to prevent leakage of product between the outer surface of the sleeve and the annular inner surface of the cylinder wall.