Magnetically coupled centrifugal pumps are single-stage, end-suction flow pumps with axial inlet design. The models developed by Sager + Mack are available in plastic (PP/PVDF) or stainless steel (V4A) and are known for their high operational reliability, corrosion resistance, and leak-free design. The fluid enters axially into the impeller, is accelerated by its rotation, and directed toward the discharge side. Power transmission from the motor to the impeller shaft occurs contact-free via a magnetic coupling between outer and inner magnets, separated by a hermetically sealed containment shell – with no rotating external seal.
The pump head is made from solid material and is equipped with flanged, threaded, or hose-type connections depending on the configuration. The impeller is mounted on a non-wetted stainless steel shaft supported radially and axially by high-grade silicon carbide (SiC) slide bearings. A special impeller geometry ensures smooth operation, high efficiency even with contaminated fluids containing solids, and a flat pump curve – advantageous in many process applications.
Flow rate and pressure depend on impeller geometry, system pressure losses, and motor speed. Typical performance data: pressure up to 6 bar, flow rates up to 120 m³/h, viscosities up to 100 mPas, temperature range 5–95 °C (plastic) or 0–120 °C (stainless steel), motor power between 0.8 and 9.2 kW. Solid content up to 25% is possible depending on pump size and medium. These pumps are not self-priming and require a minimum inlet pressure.
They are mainly used as transfer or circulation pumps for chemically aggressive, environmentally hazardous, or abrasive fluids such as acids, alkalis, and chemicals. Sealing is achieved via media-resistant O-rings at the containment shell; special versions with single mechanical seals are available upon request. All wetted parts are chemically resistant and selected to match the medium.
