GS Single Screw Pump with Loose Pusher – Technical Overview The GS single screw pump with a loose pusher is a highly efficient and versatile positive displacement pump designed for handling viscous, abrasive, or shear-sensitive fluids. Its unique design ensures smooth, pulsation-free flow, making it suitable for a wide range of industrial applications, including oil and gas, wastewater treatment, food processing, and chemical transfer. Design and Working Principle The pump consists of three main components: 1. Stator: A stationary elastomeric liner with a double-helical internal cavity. The stator material is selected based on fluid compatibility, offering resistance to abrasion, chemicals, and high temperatures. 2. Rotor: A single-threaded, helical metal screw that rotates eccentrically within the stator. The rotor’s motion creates sealed cavities that progress along the stator, moving fluid from the suction to the discharge side. 3. Loose Pusher: Unlike traditional fixed pushers, the loose pusher design allows axial movement, reducing wear and improving sealing efficiency. This feature enhances the pump’s ability to handle solids or high-viscosity fluids without clogging. As the rotor turns, the cavities between the rotor and stator progressively increase at the suction end, drawing in fluid. The trapped fluid is then transported axially to the discharge port, where the cavity collapses, expelling the fluid at a consistent rate. Key Advantages - Low Shear: Ideal for shear-sensitive fluids (e.g., polymers, emulsions) as the gentle pumping action minimizes degradation. - Self-Priming: Capable of dry running for short periods and handling entrained gases. - Handling Abrasives: The loose pusher design reduces wear on critical components, extending service life. - High Viscosity Performance: Efficiently pumps fluids with viscosities ranging from a few cP to over 1,000,000 cP. - Reversible Flow: Direction can be changed by reversing rotor rotation. Applications - Oil & Gas: Transferring crude oil, drilling mud, or viscous hydrocarbons. - Wastewater: Sludge, grit, and abrasive slurries. - Food & Beverage: Handling syrups, chocolate, or pastes without product damage. - Chemicals: Metering corrosive or viscous chemicals safely. Maintenance Considerations The loose pusher design simplifies maintenance by reducing mechanical stress. However, periodic inspection of the stator and rotor is recommended, especially when pumping abrasive fluids. Proper material selection for the stator (e.g., nitrile, EPDM, or fluoropolymer) ensures longevity. In summary, the GS single screw pump with a loose pusher offers reliability, adaptability, and efficiency for challenging pumping tasks, making it a preferred choice across multiple industries.