Abstract: A non-dripping suck-back nozzle has a shell comprising a press cover (1), a revolving cover (2) and a cylinder (7). A needle valve (6) comprises a round rod (61) and a convex ring (62). The upper part of the round rod (61) of the needle valve (6) passes through an inner round pole (51) of a piston (5) and extends into a hollow channel (41) of a connecting bar (4). The round rod (61) and the connecting bar (4) are locked by each other. A channel is formed between the round rod (61) and the connecting bar (4). A space is formed between the round rod (61) and the inner round pole (51) of the piston (5).

Abstract: A non-dripping suck-back nozzle has a shell comprising a press cover (1), a revolving cover (2) and a cylinder (7). A needle valve (6) comprises a round rod (61) and a convex ring (62). The upper part of the round rod (61) of the needle valve (6) passes through an inner round pole (51) of a piston (5) and extends into a hollow channel (41) of a connecting bar (4). The round rod (61) and the connecting bar (4) are locked by each other. A channel is formed between the round rod (61) and the connecting bar (4). Space is formed between the round rod (61) and the inner round pole (51) of the piston (5). When the connecting bar (4) presses against the piston (5), the lower part of the inner round pole (51) of the piston (5) is separated from an annular groove (621) of the convex ring (62) of the needle valve (6).