VOLUMETRIC DOSER APPARATUS FOR PASTY MATERIAL

摘要

The apparatus is comprised of a dosing chamber (4) which is internally provided with a piston (5) displaceable freely by means of pasty material (M) introduced through a first extremity (4a) of said chamber (4) from a first position (5A) to a second position (5B), the piston being then actuated by means of a pressure fluid (F) introduced through a second extremity (4b) to return to said first position (5A), thereby displacing a volume of material (M) delimited between (5A) and (5B), said material volume being ejected through the extremity (4a) which is associated by sealed closing means (3, 17) to an opening (6a) of a housing (6) wherein is housed a valve body (7) with means (19) to move the body inside the housing (6) thereby communicating an inlet (1) with said chamber (4), and alternatingly, communicating said chamber (4) with an outlet conduit (2) having emptying piston (8).