Flow control device for a fluid dispensing apparatus.

摘要

An improved liquid dispensing apparatus (10) having a micro-adjustment (14) of the opening travel of a needle valve (15) of the apparatus (10). This micro-adjustment (14) comprises a sleeve-stop member (34) which is axially movable but non-rotatable in the body of the apparatus (10). One end of the sleeve-stop member forms an end-stop to opening movement of the needle valve (15) away from the valve seat (24). Screw threads (76) of a first pitch (P1) are formed on an external portion of the sleeve-stop member (34) and internal screw threads (77) of a second pitch (P2) different from the first pitch are formed on a portion of the apparatus body. A generally tubular adjustment screw element (35) is engaged with both the internal screw threads (77) of the body bore and the external screw threads (76) of the sleeve-stop member (34) so that rotation of the adjustment screw (35) element causes differential axial movement of the sleeve-stop member (34) for fine adjustment of the maximum opening needle valve travel.