| 摘要 |
<p>The doser apparatus comprises a dosing chamber (4) provided with a piston (5) which can be displaced by a pasty material (M) introduced from a first extremity (4a) of said chamber (4), from a first position (5A) to a second position (5B) and to be actuated by a pressure fluid (F) introduced through a second extremity (4b) to return to said first position (5A) thereby displacing a certain volume of pasty material (M) delimited between the positions (5A and 5B), said volume being ejected through the first extremity (4a) which is associated, with sealed closing means (3, 17), to a first opening (6a) of a housing (6) which contains a valve body (7) with means (19) for its actuation, the housing communicating through an inlet (1) with said chamber (4), and alternatively, said chamber (4) communicating with the outlet (2), in a direct face-to-face relationship; a pusher (20) is provided with means (21-26) to empty the body (7).</p> |
