an injection mold apparatus for forming molded plastic articles comprising a polymer supply source ; a mold cavity ; conduit connecting the mold cavity and the supply source ; an injection assembly for injecting molten polymer into the mold cavity and a gate valve associated with the conduit and having an elongate central passage terminating in an outlet orifice and a needle positioned in skewed relationship with the elongate central passage and selectively insertable into the orifice in a closed position and retractable from the orifice and the elongate central passage to provide an unrestricted polymer flow in an open position .