A metering pump is a type of precision dosing pump designed to deliver liquids at an accurately controlled flow rate. It’s widely used in chemical dosing, water treatment, and process control systems where accuracy and reliability are essential.
Depending on the pump structure and material, metering pumps can handle a wide range of liquids — from pure water to corrosive chemicals and viscous fluids.
? 1. Suitable Media Types
1. Clean Liquids
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Pure water, deionized water, distilled water
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Drinking water, cooling water
Recommended materials: PVC, PP, PVDF, 316L stainless steel
2. Acidic Media
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Hydrochloric acid (HCl)
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Sulfuric acid (H₂SO₄)
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Nitric acid (HNO₃)
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Acetic acid (CH₃COOH)
Recommended materials: PVDF, PTFE, PVC, PE, ceramic, 316L stainless steel (for low concentrations)
3. Alkaline Media
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Sodium hydroxide (NaOH)
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Ammonia solution (NH₃·H₂O)
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Potassium hydroxide (KOH)
Recommended materials: PVC, PP, PTFE, PVDF
4. Corrosive Chemicals
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Sodium hypochlorite (NaClO)
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Calcium hypochlorite (Ca(ClO)₂)
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Hydrogen peroxide (H₂O₂)
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Fluorine-based liquids (special materials required for hydrofluoric acid)
Recommended materials: PVDF, PTFE, ceramic, Hastelloy C
5. Viscous Fluids
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Polymer solutions (PAM, PAA)
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Glycerin, syrup
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Oils, emulsions
Recommended pump types: Plunger metering pumps, hydraulic diaphragm metering pumps
Tip: Heating, insulation, or anti-blocking designs are recommended for viscous media.
6. Disinfectants and Gas Absorption Liquids
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Chlorine dioxide (ClO₂)
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Ozone water (O₃)
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Bleaching agents, biocides
Common applications: Water disinfection and wastewater treatment
⚙️ 2. Typical Industry Applications
| Industry | Typical Media | Recommended Materials |
|---|---|---|
| Wastewater Treatment | Coagulants, acids, alkalis, disinfectants | PVC / PVDF |
| Chemical Processing | Acids, solvents, organic liquids | PTFE / 316L / Hastelloy |
| Food & Beverage | Flavorings, syrups, enzyme solutions | 316L Stainless Steel / Food-grade PTFE |
| Pharmaceutical | Reagents, purified water | 316L / PVDF |
| Pulp & Paper | Additives, dyes, bleaching solutions | PVC / PP |
| Electroplating | Plating solutions, acid washing fluids | PVDF / PTFE / Hastelloy |
? 3. Key Selection Tips
When selecting a metering pump, the four critical factors are:
➡️ Medium Type
➡️ Flow Rate
➡️ Discharge Pressure
➡️ Pump Material
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For strongly corrosive liquids, choose a PTFE or PVDF diaphragm metering pump.
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For high-viscosity or high-pressure applications, use a hydraulic diaphragm metering pump.
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For clean, non-corrosive liquids, a plunger or mechanical diaphragm pump is sufficient.