| 摘要 |
Dosing pump for liquids to be connected to a container, comprising: a cylindrical chamber (13; 130) receiving the liquid to be dispensed, a first piston (12; 120) sliding inside said cylindrical chamber, a second piston (16; 160), also placed inside said cylindrical chamber, coaxial with respect to the first piston and acting as a valve element, check valves (20, 18, 22, 220, 180), at least an elastic element (1, 6; 600) that makes the piston go back to its rest position after the dispensing, characterized in that said elastic means (1, 6; 600) is a bellows made of plastic, carried out by injection molding and having a spiral-shaped side surface. |
