| 摘要 |
In a filling machine, liquids are dispensed from a unit (11) with a nozzle (13) composed of a duct (18), and a valve element (21) attached to a reciprocating stem (22) aligned on a longitudinal axis (B) of the duct (18); the nozzle (13) is surmounted by an actuator assembly (14) operating the valve element (21) and delimiting at least one fluid-tight enclosure (37; 51, 53) equipped with a movable partition (36; 36, 59) that can be displaced controllably by generating pressure internally of the enclosure, in such a way as to shift the stem (22) and the associated valve element (21) between a closed position and at least one open position.
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