DOUBLE SEAL VALVE PIN TIP WITH VENT
FIG2 is an enlarged fragmentary view of the tip of the nozzle and complementary mold aperture components of the FIG1 system
As shown in FIG2, the apparatus 10 includes a nozzle assembly (200) that routs the injection fluid material (23) to the mold cavity (80). The nozzle assembly (200) comprises a nozzle tip (210) disposed and typically screwably attached to or at the distalmost end of the nozzle body 50. The assembly comprises a distal projection (220) having a downstream central bore (230) that communicates with the upstream fluid delivery channel (27). The central bore 230 has an inner surface (230is) adapted to slidably receive a complementary in shape outer surface (90os) of a distal end (90de) of the valve pin (90).
enlarged view
210
nozzle tip
230
bore
400
flat recess
90
pin
300
gate
200
assembly
['1. An assembly (200) for routing an injection fluid (23) to a mold cavity (80) in an injection molding apparatus (10) comprised of an injection molding machine (20), a heated manifold (30) that receives the injection fluid (23), and a valve pin (90) drivable along an upstream and downstream path of travel (UD) through a fluid delivery channel (27) leading to a cavity (80) of a mold (310a, 310b), comprising: a distal nozzle tip (210) comprising a distal projection (220) having an outer circumferential surface (220ocs) and a central bore (230) that communicates with the fluid delivery channel (27) and having an inner surface (220is) adapted to receive a distal end (90de) of the valve pin (90), a mold (310a, 310b) having a cavity entrance aperture (300) forming a gate through which the injection fluid (23) is routed into the cavity (80), the cavity entrance aperture (300) having a downstream inner circumferential surface (300ics), characterised by  the distal nozzle tip (210) being mounted such that the distal projection (220) is disposed in a stationary position within the cavity entrance aperture (300) wherein the outer circumferential surface (220ocs) of the distal nozzle tip (210) is disposed adjacent the downstream inner circumferential surface (300ics) forming a gap (Z) having a width sufficient to enable air or gas to flow upstream (AU1) through the gap (Z) upon downstream movement (D) of the distal end (90de) of the valve pin (90) through the central bore (230) of the distal projection (220).']