| 摘要 |
In the position represented to the right of the vertical axis, the cap screwed onto the neck 2 closes the receptacle in a leaktight manner, while at the same time pushing back the rod 10 of the valve 3 against the action of the elastic bulged diaphragm 6 formed at the lower end of the cylindrical wall 16 rigidly fixed inside the neck 2. In order to obtain the dose, it is sufficient to invert the closed receptacle head downwards and completely to unscrew the cap filled with the desired dose. In fact, the fluid product contained in the receptacle flows in this position towards the volume delimited by the wall 16, passing through the open valve 3 and through the opening 19 formed in the diaphragm 6, ceasing to flow in the position represented to the left of the vertical axis, in which the unscrewed cap 1 allows the diaphragm 6 to return the valve 3 to abutment against its seat 4. <IMAGE>
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