Sprue valve needle structure for hot runner system and hot runner system

The utility model belongs to the technical field of dies, and particularly relates to a hot runner system. A sprue valve needle structure for a hot runner system comprises a nozzle body, a beryllium copper insert matched with the nozzle body and good in heat conduction wraps the nozzle body, and an air heat insulation layer is arranged between the beryllium copper insert and the nozzle body. Wherein the nozzle body comprises a valve needle positioning sleeve, a valve needle for controlling the opening and closing of a pouring gate is arranged in the valve needle positioning sleeve, a hot runner nozzle sleeve is coated outside the valve needle positioning sleeve, and the hot runner nozzle sleeve is embedded in the nozzle body. A traditional hot runner sprue bush used on a low-pressure double-layer injection mold is changed into an embedded type; in other words, the circulation mode of a hot runner sprue bush is canceled, material flow directly makes contact with the mold, the contact area of a hot runner and t