Equipping a gear pump in front of the extruder, checking pressure before thepump and controling the speed of extrusion, which can minimizing pulsationand irregular material feeding and ensures the polymer is smoothly extrudedand continuously delivered to the die head. The system can be widely used tomeasuring and adding pressure for PC, PMMA, ABS, PET, PVB, PS, PP, PE.The shell of the pump adopts high-quality alloy- -steel and the gear usesquenched chrome steel or other high- -grade metallic materials which ensureshigh eficiency and leakage-proof.