Technical Article

Suofu NP series micro magnetic gear pumps feature leak-free operation, high pressure, and the ability to handle gas-liquid two-phase flows, making them suitable for small cooling systems using various fluorocarbons. As these fluids are prone to vaporization, specific system configurations are recommended for reliable operation. Key guidelines include maintaining approximately 2°C of subcooling before the pump, controlling inlet flow velocity, using a large-radius 90° elbow, and installing a high-flow 400-mesh filter. A controlled startup at low speed (e.g., 500 rpm) and a venting procedure via a return line with motor current monitoring are advised to purge inlet gas before reaching full operating speed. Read More

Gear pumps are generally suitable for conveying clean, particle-free liquids. Their operating principle relies on the meshing of gears with very fine internal clearances. Solid particles larger than these clearances, typically on the order of 0.02mm in some micro pump models, can cause seizure. Furthermore, particles entering the meshing gear teeth or bearing surfaces cause accelerated wear, significantly reducing service life. Therefore, their application is limited for media containing abrasives. The required internal clearance decreases when handling low-viscosity fluids or operating under high pressure differentials, further increasing sensitivity to particulate contamination. Read More

The Suofu NP series micro magnetic gear pumps are engineered for cooling and refrigeration systems. Their defining features—leak-free operation, dry-running capability, strong self-priming, and minimal flow fluctuation under pressure changes—make them particularly suitable for handling volatile, low-viscosity refrigerants like various fluorocarbons and fluorinated fluids. These pumps excel in applications requiring precise temperature control, high-pressure microchannel systems, and environments with wide temperature ranges (-40°C to 150°C, extendable to -120°C). The magnetic drive and optional fully welded construction ensure zero leakage, while the design allows for flexible customization in motor type, installation, and configuration to meet diverse system integration needs. Read More

When transporting low-viscosity or poorly lubricating liquids like water or solvents, gear pumps require materials with excellent self-lubricating properties to prevent gear seizure. Plastic gears, particularly those made from engineered materials like reinforced PEEK, are often more suitable than metal for such applications due to their inherent self-lubrication, good PV (pressure-velocity) value, and corrosion resistance. For instance, the NP series micro magnetic gear pumps from Shanghai Super Fluid Co., Ltd. (Suofu) utilize such PEEK gears and bearings, offering a reliable solution for small-flow, low-to-medium pressure pumping scenarios where rigidity, precision, and durability are needed. Read More

Gear pump working pressure is determined not by the pump alone, but by the backpressure in the downstream system. This backpressure originates from the combined resistance of the piping and the load at the pipeline's end. Consequently, a pump's actual operating pressure will only match the system's total resistance, even if the pump's rated capability is higher. Therefore, proper pump selection requires ensuring the pump's pressure capacity exceeds this total system demand to achieve the necessary fluid delivery. Read More

Gear Pump Insufficient Pressure Fault Cause Analysis: Part 3 focuses on troubleshooting when an actual gear pump's pressure is insufficient, causing the system to underperform relative to its design. After ruling out incorrect system pressure design, the analysis directs inspection towards three primary areas: whether the selected motor power is inadequate, if the gear pump itself is worn, and if the system supply to the pump is insufficient. For pump wear, a key recommendation is to install a pre-pump filter with a mesh count exceeding 400 to prevent particulate contamination, as gear pumps are unsuitable for media containing solids. Reference is made to a separate analysis for detailed causes of insufficient supply. Read More