Sanitary Screw Pump for Viscous Fluids A sanitary screw pump is a highly efficient positive displacement pump designed for handling viscous, shear-sensitive, and hygienic fluid applications. It is widely used in industries such as food and beverage, pharmaceuticals, cosmetics, and chemical processing, where maintaining product integrity and cleanliness is critical. The pump’s design ensures gentle product handling, minimal shear, and easy cleaning, making it ideal for viscous or semi-solid fluids like pastes, creams, syrups, and slurries. Design and Working Principle The sanitary screw pump operates on the principle of progressive cavity pumping. It consists of a single or double helical rotor (screw) rotating within a stator made of elastomeric material. As the rotor turns, cavities form and progress along the pump’s length, moving the fluid smoothly from the suction to the discharge side. This design ensures a continuous, pulsation-free flow, which is crucial for maintaining product consistency and preventing degradation of shear-sensitive materials. Key components include: - Rotor: Typically made of stainless steel (e.g., 316L) for corrosion resistance and durability. - Stator: Constructed from food-grade elastomers (e.g., EPDM, NBR, or PTFE) to ensure compatibility with various fluids and ease of cleaning. - Sanitary Connections: Tri-clamp or DIN fittings for quick disassembly and compliance with hygiene standards. - Sealing System: Mechanical seals or lip seals to prevent leakage and contamination. Advantages 1. Gentle Handling: The low-shear action preserves the viscosity and texture of sensitive fluids. 2. High Efficiency: Capable of handling high-viscosity fluids (up to 1,000,000 cP) with consistent flow rates. 3. Self-Priming: Can operate under dry conditions and handle entrained gases without losing prime. 4. Easy Cleaning: Complies with sanitary standards (e.g., 3-A, EHEDG, FDA) and supports CIP/SIP processes. 5. Reversible Flow: Allows bidirectional pumping for flexible operation. Applications - Food & Beverage: Pumping chocolate, yogurt, jam, honey, and sauces. - Pharmaceuticals: Transferring ointments, gels, and syrups. - Cosmetics: Handling lotions, creams, and thick emulsions. - Chemicals: Processing adhesives, resins, and lubricants. Maintenance Considerations - Regular inspection of the stator for wear and tear. - Proper lubrication of bearings and seals. - Ensuring alignment between rotor and stator to prevent premature failure. In summary, the sanitary screw pump is a versatile and reliable solution for viscous fluid transfer in hygienic industries, offering precision, cleanliness, and operational efficiency.