Volumetric dosing device i.e. pump, for e.g. pharmaceutical industry, has groove communicating with bottom of mobile part to define dosage chamber, and supply and ejection channels opened at level of groove in non-simultaneous manner

摘要

The device has a cylindrical mobile part (3) i.e. cylinder, driven based on translation movement along a fixed part (2) i.e. piston, and rotational movement relative to the fixed part. Liquid supply and ejection channels (9, 10) are opened at periphery of a cylindrical zone (8) of the fixed part. The mobile part has a longitudinal groove (14) extending along a surface of the mobile part and communicating with bottom (15) of the mobile part to define a dosage chamber. The channels are opened at a level of the groove in a non-simultaneous manner.