Working principle: the motor drives the outer magnet rotor to rotate → the magnetic field passes through the containment shell → it drives the inner magnet rotor and impeller to rotate synchronously → the impeller rotates at high speed, generating centrifugal force that draws liquid in through the inlet and discharges it under pressure through the outlet.

• Zero leakage: static seals replace the conventional mechanical (dynamic) seal, making the pump body completely leak-free.
• Easy maintenance: no periodic seal replacement, low noise and vibration, and low long-term operating costs.
• Corrosion resistance: wetted parts can be configured in different materials.
• Smooth operation: non-contact transmission with high precision.

• Dry running prohibited: the inner magnet rotor and sleeve bearings are lubricated and cooled by the medium itself; a few minutes of dry running can cause demagnetization or bearing burnout.
• Slightly lower efficiency: eddy current losses in the containment shell reduce efficiency by about 3%–5% versus a comparable conventional centrifugal pump.
• Unsuitable for solids-laden media: particles accelerate wear of the sleeve bearings and containment shell; the medium is normally required to be clean.
• Limited power: typically no more than 30 kW.
• Temperature sensitive: permanent-magnet materials have a maximum working temperature; overheating causes demagnetization and drive failure.

• Chemical: transfer of concentrated sulfuric acid, hydrochloric acid, hydrofluoric acid, organic solvents, etc.
• Pharmaceutical: transfer of API solvents, intermediate fluids, high-purity reagents, etc.
• Electroplating: plating-solution circulation, etchant transfer, etc.
• New energy: transfer of NMP, lithium-battery electrolyte, etc.
• Semiconductor: transfer of hydrofluoric acid, CMP high-purity reagents, etc.

Working principle: the motor drives the outer magnet rotor to rotate → the magnetic field passes through the containment shell → it drives the inner magnet rotor and gear shaft to rotate synchronously → a pair of meshing gears rotates inside the pump chamber; a partial vacuum forms on the side where the teeth disengage, drawing liquid in; as the gears continue to rotate, the liquid is squeezed along the inner wall of the pump body and discharged through the outlet.

• Zero leakage: magnetic drive replaces the shaft seal, completely eliminating the shaft-seal leakage typical of conventional gear pumps.
• Accurate flow and low pulsation: gear meshing displaces a nearly fixed volume per revolution, giving far steadier output than a centrifugal pump.
• Strong self-priming: no priming required before startup.
• Compact structure: small and lightweight (especially micro magnetic gear pumps), ideal for integration into compact equipment.
• Corrosion resistance: with engineering-plastic or stainless steel construction, it can transfer various acid and alkali solutions.

• Unsuitable for solids-containing media: gear clearances are very small; particles can cause seizure or accelerated wear.
• Dry running prohibited: gears and bearings are lubricated by the medium; prolonged dry running causes burnout.
• Noise and wear: gear meshing produces some noise, and long-term gear wear degrades metering accuracy.
• Limited power and displacement: compared with centrifugal pumps, gear pumps displace less per revolution and are less suited to large-flow applications.

• Chemical: precise transfer of medium-viscosity media such as acid/alkali solutions, resins and adhesives.
• Pharmaceutical: metered transfer of high-purity liquids.
• Ink printing: continuous, stable transfer of inkjet printing inks.
• Lubrication systems: metered oil supply and circulation of lubricating oil.
• Laboratory: cooling-circulation fluid transfer for precision instruments.

Working principle: the motor drives the outer magnet rotor to rotate → the magnetic field passes through the containment shell → it drives the inner magnet rotor and vortex-type impeller to rotate synchronously.

• High head and small flow: the specific speed is generally below 40; a single stage can achieve a very high head of up to 210 m, which a conventional centrifugal pump would need multiple stages to reach.
• Zero leakage: suitable for flammable, explosive, toxic and hazardous liquids.
• Gas-liquid mixed transfer: vortex pumps are insensitive to gas, can handle gas-entrained liquids, and can transfer volatile media such as gasoline and alcohol.
• Compact structure: much smaller and lighter than a positive-displacement pump at the same head; easy to install.
• Stable flow and low noise: pulsation-free output and smooth operation.

• Low efficiency: large energy losses from vortex flow.
• Unsuitable for high-viscosity media: efficiency drops sharply as viscosity increases; only suitable for low-viscosity liquids.
• Unsuitable for solids-containing media: particles accelerate wear.
• Dry running prohibited: relies on the medium for lubrication and cooling; dry running causes demagnetization or burnout.
• Higher cost: the vortex impeller requires high machining precision, making it more expensive than a comparable centrifugal pump.

• Chemical: transfer of volatile low-viscosity solvents such as gasoline and alcohol.
• Petroleum: transfer of gas-entrained crude oil.
• Refrigeration: circulating refrigerant transfer.
• Boiler feed: low-flow, high-head makeup-water systems.
• High-pressure cleaning: cleaning equipment requiring high pressure and low flow.
• Experimental apparatus: precision circulation systems in laboratories.

Working principle: the motor drives the outer magnet rotor to rotate → the magnetic field passes through the containment shell → it drives the inner magnet rotor and screw to rotate synchronously.

The screw performs planetary motion inside the pump body, forming multiple continuous sealed chambers between the screw and the pump body. As the screw rotates, these sealed chambers move uniformly from the suction end toward the discharge end, and the liquid is conveyed steadily forward as if ‘screw-propelled.’ Because of the uniform axial propulsion, the flow is pulsation-free and pressure builds slowly and steadily.

• Zero leakage: suitable for flammable, explosive, toxic, hazardous and highly corrosive media.
• Strong high-viscosity capability: easily transfers high-viscosity liquids such as glue, resin, asphalt and syrup.
• Pulsation-free flow: uniform axial propulsion gives extremely smooth output, especially friendly to pressure-sensitive processes.
• Strong self-priming: good self-priming performance, no priming required before startup.
• Media-friendly: low shear force, will not damage the physical structure of the pumped material.
• Can handle media with small amounts of solids: more tolerant of impurities than a gear pump.

• Dry running prohibited: the screw and bushing are lubricated by the medium; dry running causes rapid burnout.
• High machining precision and cost: the screw meshing precision requirement is high, making it more expensive than both centrifugal and gear pumps.
• Relatively bulky: longer and heavier than other magnetic pump types, requiring more installation space.
• Complex maintenance: the screw-to-bushing clearance is critical; disassembly and repair require high technical skill.
• Unsuitable for low-viscosity, large-flow applications: efficiency drops markedly at very low viscosity; less cost-effective than a centrifugal pump.

• Chemical: transfer of high-viscosity media such as adhesives, resins, paints and asphalt.
• Food: viscous fluids such as syrup, honey and chocolate liquor.
• Pharmaceutical: transfer of ointments, pastes and high-viscosity stock solutions.
• Petroleum: transfer of heavy oil and viscous crude.
• Environmental: transfer of sludge and high-concentration wastewater.

The corrosion-resistant chemical magnetic pump works the same way as an ordinary magnetic pump. The key to corrosion resistance lies in the material selection of the wetted parts, ranked from low to high corrosion resistance:

Reinforced polypropylene (RPP/FRPP): for mildly corrosive conditions; low cost, suitable for low-concentration acids and alkalis.

Stainless steel (304/316L): general-purpose corrosion resistance, suitable for weakly corrosive media (e.g., dilute acids/alkalis, salt solutions); high mechanical strength, widely used in the pharmaceutical and food industries.

Fluoroplastics (F46/FEP, PTFE, PFA, PVDF): the ceiling of corrosion resistance. They are stable against strong acids of any concentration (sulfuric, hydrochloric, nitric, hydrofluoric), strong alkalis and organic solvents — currently the material of choice for highly corrosive service.

The common practice is a metal casing to provide mechanical strength and a fluoroplastic inner lining to resist corrosion; the combination balances durability and pressure resistance.

• Outstanding corrosion resistance: fluoroplastic materials can transfer almost all common corrosive media without frequent replacement.
• Zero leakage: extremely high safety when transferring hazardous chemicals.
• Non-contaminating: fluoroplastics are extremely chemically stable and do not leach metal ions into the medium, suiting high-purity processes in the semiconductor and pharmaceutical industries.
• Wide temperature range: fluoroplastic magnetic pumps generally operate stably from -20 °C to 150 °C.
• Low maintenance cost: long service life and resistance to corrosion perforation save frequent pump-replacement costs over the long term.

• Higher cost: fluoroplastic materials and lining processes cost more than ordinary stainless steel pumps.
• Dry running prohibited: sleeve bearings rely on the medium for lubrication; dry running causes burnout.
• Unsuitable for solids-laden media: particles accelerate wear of the lining and sleeve bearings.
• Limited mechanical strength: fluoroplastics are not as strong as metal, require a metal casing for support, and the structure is relatively complex.
• Relatively low efficiency: eddy current losses in the containment shell reduce efficiency by about 3%–5% versus a comparable conventional centrifugal pump.

• Chemical: transfer of concentrated sulfuric acid, hydrochloric acid, hydrofluoric acid, nitric acid, etc.
• Electroplating: transfer of plating solutions, chromic acid, etchants, etc.
• Pharmaceutical: transfer of organic solvents, corrosive liquids, etc.
• Semiconductor: transfer of hydrofluoric acid, high-purity reagents, etc.
• Environmental: transfer of acid/alkali wastewater, scrubber liquid, etc.
• Metallurgy: transfer of pickling solution, corrosive wastewater, etc.

The high-temperature magnetic pump shares the same basic principle as an ordinary magnetic pump, but adds several key designs for high-temperature service:

High-temperature magnets: ordinary NdFeB magnets demagnetize easily at high temperature; high-temperature pumps use samarium-cobalt magnets (SmCo), which withstand up to 300–350 °C, have high coercivity and minimal magnetic decay at high temperature.

Cooling system: a water-cooling device is added between the motor and the magnetic coupling to prevent heat from the high-temperature medium from being conducted to the motor, keeping the motor running normally.

High-temperature containment shell: made of Hastelloy, titanium alloy, etc., retaining strength and corrosion resistance at high temperature.

Temperature monitoring: a platinum resistance temperature sensor can be installed on the outer surface of the containment shell to monitor temperature rise in real time, with alarm or automatic shutdown on over-limit.

Currently mainstream high-temperature magnetic pumps operate stably from -20 °C to 350 °C, with special designs reaching 450 °C.

• Zero leakage + high temperature: simultaneously meets both leak-free and high-temperature transfer requirements — a combination hard to achieve with other pump types.
• Wide temperature coverage: one pump can cover a broad span from cryogenic to high temperature, reducing pump-change costs.
• High safety: an ideal transfer method for flammable, explosive and toxic high-temperature media such as heat-transfer oil and hot acids/alkalis.
• Compact structure: much smaller than a multistage centrifugal pump for the same high-temperature duty.
• Low maintenance cost: no mechanical seal and few wearing parts keep maintenance costs low.

• Higher cost: samarium-cobalt magnets, a Hastelloy containment shell and a water-cooling system make the overall cost higher than an ordinary magnetic pump.
• Dry running prohibited: sleeve bearings rely on the medium for lubrication; dry running causes demagnetization or even burnout.
• Relatively low efficiency: eddy current losses in the containment shell are more pronounced at high temperature; efficiency is about 3%–5% lower than a comparable conventional centrifugal pump.
• Strict temperature control: the medium temperature must stay within the magnet’s tolerance, otherwise a single demagnetization means scrapping the pump.
• Unsuitable for solids-laden media: particles accelerate wear, with more severe consequences at high temperature.

• Petroleum refining: transfer of hot crude oil, heavy oil, asphalt, etc.
• Chemical: transfer of hot acid/alkali liquids, organic solvents, etc.
• Printing and dyeing: transfer of hot dye liquors, auxiliaries, etc.
• Heat-transfer-oil systems: transfer of high-temperature heat carriers such as diphenyl ether and mineral oil.
• Pharmaceutical: transfer of hot reaction liquids, intermediates, etc.
• Semiconductor: transfer of hot cleaning solutions, etchants, etc.

The core of the plastic magnetic pump is that the wetted parts — pump body, impeller and the inner wall of the containment shell — use plastic instead of metal. There are two categories by material:

Engineering-plastic magnetic pump: the pump body and impeller are injection-molded from engineering plastics such as reinforced polypropylene (FRPP), with a stainless steel casing to strengthen the structure. Corrosion resistance is moderate.

Fluoroplastic magnetic pump: all wetted parts use fluoroplastics (FEP, PFA, PVDF, etc.), with corrosion resistance near the ‘ceiling.’ In fluoroplastic-lined pumps the lining is integrally molded; the metal casing only provides external support, and the medium contacts plastic exclusively. The temperature range is about -30 °C to 190 °C, normally lower than for metal pumps.

• Excellent corrosion resistance: fluoroplastics suit almost any concentration of strong acids, strong alkalis and organic solvents without swelling, aging or leaching toxins.
• Zero leakage: magnetic drive replaces the shaft seal, eliminating leakage.
• Non-contaminating: plastic materials do not leach metal ions into the medium, suiting high-purity process requirements.
• Compact and easy to maintain: small and lightweight, with no mechanical seals requiring frequent replacement.
• Lower cost: cheaper overall than an all-metal, fluoropolymer-lined magnetic pump.

• Limited temperature ceiling: fluoroplastics generally do not exceed 190 °C, far lower than metal magnetic pumps (up to 350 °C).
• Mechanical strength below metal: plastics have limited intrinsic strength and pressure capacity, relying on the metal casing for reinforcement.
• Dry running prohibited: as with ordinary magnetic pumps, sleeve bearings rely on the medium for lubrication; dry running causes burnout.
• Unsuitable for solids-laden media: the plastic lining is difficult to repair once worn by particles.

• Chemical: transfer of sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, etc.
• Electroplating: transfer of plating solutions, etchants, pickling solutions, etc.
• Pharmaceutical: transfer of organic solvents, corrosive liquids, etc.
• Semiconductor: transfer of high-purity reagents, cleaning solutions, etc.
• Environmental: transfer of acid/alkali wastewater, scrubber liquid, etc.

The stainless steel magnetic pump uses 304, 316 or 316L stainless steel for the wetted parts. Depending on the grade, corrosion resistance falls into three tiers:

304 stainless steel: general-purpose, suitable for neutral media and mildly corrosive service, such as clean water, dilute organic acids and ordinary salt solutions; very cost-effective.

316 stainless steel: higher molybdenum content, stronger resistance to chloride-induced pitting and crevice corrosion; often used for seawater, brine and chloride-containing wastewater, and suitable for weak organic acids such as acetic, citric and lactic acid. In addition, 316/316L has a high surface finish that resists adhesion and is easy to clean and sterilize, so it is widely used in pharmaceutical GMP workshops and food processing plants.

316L stainless steel: lower carbon content than 316, stronger resistance to intergranular corrosion, and no corrosion weak points form at welds after welding. For welded components or elevated-temperature service, 316L is more suitable than 316.

• Same as ordinary magnetic pumps: zero leakage and easy maintenance.
• Above-average corrosion resistance: good tolerance to dilute nitric acid, organic acids, weak alkalis, salt solutions, etc.
• High mechanical strength: clearly stronger pressure and impact resistance than plastic magnetic pumps, with a more robust structure.
• Wide temperature range: generally stable from -20 °C to 200 °C; some models with samarium-cobalt magnets reach higher temperatures.
• Good hygienic performance: the smooth stainless steel surface resists fouling and is easy to clean in the pharmaceutical, food and semiconductor industries.

• Unsuitable for highly corrosive media: concentrated sulfuric acid, hydrochloric acid, hydrofluoric acid and concentrated nitric acid corrode stainless steel rapidly; the wrong material can perforate within months.
• Higher cost than ordinary centrifugal pumps: stainless steel plus the magnetic-drive structure usually costs more than an ordinary centrifugal pump.
• Same as ordinary magnetic pumps: dry running prohibited, unsuitable for solids-laden media, and relatively low efficiency.

• Chemical: transfer of dilute acids, organic solvents, alcohols, etc.
• Pharmaceutical: liquid circulation, GMP clean transfer, etc.
• Food: transfer of beverages, dairy products, purified water, etc.
• Electroplating: circulation of mildly corrosive plating solutions, etc.
• Environmental: weakly acidic/alkaline wastewater treatment.
• Semiconductor: transfer of ultrapure water, cleaning solutions, etc.

The alloy magnetic pump is designed for extreme corrosion and high-temperature service. Its wetted parts — pump body, impeller and containment shell — use special alloy materials that operate more reliably under harsher conditions than ordinary stainless steel and fluoroplastics. Common alloy types fall into three categories:

Titanium alloy: low density, high strength and outstanding corrosion resistance; suitable for chloride-ion and oxidizing media such as wet chlorine, seawater and hypochlorite, but must not be used for hydrofluoric acid or strongly reducing acids.

Hastelloy: C276 is the most common grade, resistant to all acids except hydrofluoric acid, resistant to chloride ions and high temperature. The B series is specifically resistant to reducing acids such as hydrochloric and sulfuric acid.

Duplex stainless steel (2205/2507): a ferrite + austenite duplex structure with twice the strength of ordinary stainless steel, stronger resistance to chloride pitting than 316L, and lower cost than Hastelloy.

• Strong corrosion resistance: Hastelloy C276 suits almost all common strong acids and alkalis (except hydrofluoric acid); titanium alloy excels in oxidizing media; duplex steel far exceeds 316L in chloride-pitting resistance.
• Good high-temperature performance: alloy materials have far higher temperature limits than fluoroplastics; Hastelloy and titanium alloy can work long-term above 350 °C, and with samarium-cobalt magnets achieve full temperature-range coverage.
• High mechanical strength: stronger pressure and impact resistance than fluoroplastic pumps, suitable for high-pressure service.
• Zero leakage: magnetic drive replaces the shaft seal, providing high safety when transferring toxic, hazardous and flammable media.
• Low eddy current loss containment shell: using high-resistivity materials such as titanium alloy or Hastelloy for the containment shell effectively reduces eddy-current heating and improves efficiency.

• Titanium alloy has zero tolerance to hydrofluoric acid; unsuitable for solids-laden media; dry running prohibited.
• Expensive: Hastelloy is 5–10 times the price of 316 stainless steel, and the whole pump costs far more than an ordinary magnetic pump.
• Difficult to machine: both Hastelloy and titanium alloy are difficult-to-machine materials with long manufacturing cycles and high repair/replacement costs.

• Titanium alloy: suitable for wet chlorine, seawater, sodium hypochlorite, etc.; commonly used in the chlor-alkali industry, seawater desalination and marine engineering.
• Hastelloy C: suitable for hydrochloric, sulfuric, phosphoric and organic acids, etc.; commonly used in fine chemicals, pesticide synthesis and hydrometallurgy.
• Hastelloy B: suitable for pure hydrochloric acid, pure sulfuric acid, etc.; commonly used for high-concentration reducing-acid transfer.
• Duplex stainless steel: suitable for chloride-containing wastewater, seawater, brine, etc.; commonly used in petroleum refining, environmental engineering and offshore platforms.