100 of poppet member 46 thus the transverse width of a flute 120 between two adjacent spaced apart ribs 122 increases from end 104 to end 100 of poppet member 46 and the transverse width of each rib 122 decreases from end 104 to end 100 of poppet member 46 the front discharge valve 10 containing the poppet valve assembly 12 is installed in a conventional plastic injection molding machine and the poppet valve assembly 12 operates in the same manner as other ball and poppet style check valves in such molding machines as the feed screw 14 within the injection molding machine turns and advances molten thermoplastic material through the front discharge valve 10 the flowing thermoplastic material pushes poppet member 46 away from the tapered valve seating surface 84 on insert 44 causing the front discharge valve 10 to open permitting thermoplastic material to flow between flutes 120 on poppet member 46 and the surface defining bore 58 in holder 42 once the cavity in front of the front discharge valve 10 is full the feed screw 14 stops turning and moves toward the end cap 36 causing thermoplastic material to be injected into the die and causing pressure to increase in front of the discharge valve 10 which in turn causes the thermoplastic material to start moving in the opposite direction through flutes 120 and the surface defining bore 58 in holder 42 the u201c backflowing u201d thermoplastic material grippingly engages the poppet member 46 causing poppet member 46 to move with the thermoplastic.