The screen changer filter and metering melt pump series are suitable for blending filtration processing and metered pressurized conveying in the production of various viscous fluid materials and products, including plastics, chemical fibers, rubber, hot melt adhesives, adhesives, coating materials, and compounding agents. They enable uninterrupted production during screen replacement without material leakage, boosting output while saving energy, labor, and time. They deliver constant flow rates