Patent ID: 8881958

Claim:
A fluid dose-measuring device adapted to be releasably received in a dispensing apparatus having an electromagnetic coil, the device comprising: a housing with an outlet passage and a connector part defining an inlet passage, said housing forming an internal chamber that is in fluid communication with the inlet passage and the outlet passage, and said connector part being connectable to a fluid container; a piston moveably arranged in the internal chamber of the housing for reciprocating motion between a closed position in which a fluid flow from the inlet passage to the outlet passage is prevented and an open position in which a fluid flow from the inlet passage to the outlet passage is allowed, said piston comprising a ferromagnetic actuation part for electromagnetic actuation of the piston by the electromagnetic coil, the piston further comprises an outer body made of plastic, the outer body comprising a protrusion to sealingly engage with the outlet passage in the closed position, and said ferromagnetic actuation part is arranged in the outer body such that the outer body encapsulates said ferromagnetic actuation part and prevents contact between said ferromagnetic actuation part and said fluid flow through the internal chamber of the housing, wherein the outer body and the outlet passage have respective sealing surfaces engaging with each other in the closed position, and the sealing surface of the outlet passage extends to an exterior surface of the housing.