| 摘要 |
<p>Liquid products are dispensed in a filling machine by a device comprising a main body (2), a nozzle (3) presenting an outlet (3a) from which the product is dispensed, a valve element (5) housed internally of the nozzle (3) and movable between positions in which the outlet (3a) is opened and closed, a diaphragm (9) occupying a void (8) in the main body (2) and separating complementary first and second chambers (10a, 10b) of variable volume, also a first source (11) and a second source (12) of fluid connectable selectively to the first chamber (10a) and the second chamber (10b) in such a way that the valve element (5) is caused to alternate between the open and closed positions, and a master control unit (22) by which the movements of the valve element (5) are timed and regulated according to the type of product being handled.</p> |
