| 摘要 |
A nozzle for the injection of a viscous fluid, such as a thermoplastic and a non-viscous fluid such as a gas into a mold cavity of a mold body includes a valve element (48) mounted for reciprocation in a nozzle body flow passage (28) to control a flow of viscous fluid through the nozzle body discharge end and into a mold cavity (169). The valve element includes a barrel (50) having a first end selectively engaging a portion of the nozzle body discharge end to prevent a flow of viscous fluid therepast and a second end. A bore (64) extends longitudinally through the barrel and a pin (80) is positioned in the barrel bore. The pin has a first end located adjacent the barrel first end such that the pin and the barrel define between them an annular opening at the barrel first end. The annular opening communicates with the barrel bore. The pin (80) is operatively secured to the barrel (50) such that the pin moves with the barrel as the barrel reciprocates in the nozzle body.
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