ADJUSTABLE FLOW POPPET VALVE FOR INJECTION MOLDING

摘要

A check valve for use in controlling the flow of thermoplastic material in an injection molding apparatus includes a valve body Having an axially extending chamber formed therein with an inlet opening and an outlet opening through which the material can flow. A poppet is slidably movable in the chamber between a valve closed position and a selected valve open position. The poppet has an inlet end with a conical shape and the chamber has a complementary taper portion adjacent the inlets opening, the inlet end and the taper portion sealingly cooperating for preventing flow of material through said chamber when said poppet is an the valve closed position. An adjusting ring is positioned in the chamber for selective movement between a minimum open position and a maximum open position, the adjusting zing being externally threaded for threadably engaging an internal thread formed in the chamber. The poppet has a plurality of radially extending tabs formed thereon for abutting the adjusting ring when the poppet is in the selected valve open position whereby the volume of flow of material through the chamber is proportional to the position of the adjusting ring in the chamber. The poppet also has a plurality of axially extending grooves formed therein for permitting the flaw of material from the inlet end of the poppet to an opposite end of the poppet and out the outlet end of the chamber.