Dosing Pumps For Chemical And Process Metering
Hydraulic diaphragm metering pumps from 0.1 to 500 L/h at pressures to 20 bar. Manual, 4-20 mA, or pulse-controlled, with PVDF, PTFE, and stainless liquid ends.
Everything You Need To Spec Your Dosing Pumps
Jump straight to the section that answers your question, from duty ranges and model data to quality control and sending us your project details.
Repeatable Dosing, Documented Twice Over
AF-D metering pumps keep dosing accurate across turndown from 10 to 100 percent. The hydraulic diaphragm design holds repeatability at plus or minus 1 percent, and each pump ships with a calibration certificate so your commissioning report starts from a verified baseline.
- 0.1 to 500 L/h at 1 to 20 bar liquid ends
- Repeatability within plus or minus 1 percent of setpoint
- PVDF, PTFE, or 316L liquid ends for aggressive chemicals
- Analog, pulse, and bus control with stroke feedback option
AF-D Model Data
Nominal duty data for the current AF-D frames.
| Model | Flow (L/h) | Pressure (bar) | Stroke (min-1) | Liquid End | Status |
|---|---|---|---|---|---|
| AF-D-005 | 0.1 to 5 | 10 to 20 | 58 | PVDF | In Production |
| AF-D-030 | 1 to 30 | 7 to 15 | 58 | PVDF / PTFE | Best Seller |
| AF-D-100 | 5 to 100 | 5 to 12 | 88 | PVDF / 316L | In Production |
| AF-D-250 | 20 to 250 | 3 to 10 | 116 | 316L | In Production |
| AF-D-500 | 50 to 500 | 2 to 8 | 140 | 316L Duplex | Made To Order |
Values are nominal for clean water at 20 degrees C. Confirm duty point, fluid, and motor standard with our sales engineer before ordering.
Where The Dosing Pumps Runs
Six duties this series handles week in, week out, with the configuration notes our engineers apply first.
Water Treatment
Coagulant, PAC, and chlorine dosing with stroke-feedback control.
Boiler Chemistry
Phosphate and sulfite feed with boiler-water interlocks.
Cooling Towers
Biocide and acid dosing skids with day tanks and agitators.
Reverse Osmosis
Antiscalant and SMBS dosing ahead of membranes.
Paper And Textile
Dye and chemical metering with multi-head manifolds.
Aquaculture
Low-flow chlorine neutralization with gravimetric calibration.
From Duty Point To Shipment
Four steps, each with a written output, so you always know what happens next and what arrives with the pump.
Chemical Data
Send the chemical, concentration, and dose target; we size the liquid end and wetted materials.
Skid Layout
Day tank, mixer, level switch, and pump manifold drawn for your approval.
Calibration
Each pump is calibrated across the range and shipped with its certificate.
Commissioning
4-20 mA loop checks and a dosing verification run at handover.
Dosing Pumps In Real Projects
Pumping stations and process lines built with this series, straight from our cases and video library.
CaseNorth AmericaOntario Cooling Tower Chemical SkidA food plant replaced drum-and-metering-pipe dosing with an AF-D skid; biocide and acid feed now track conductivity within...
VideoFactory Tour: From Bench To CrateA walk down the Aquaflow hall: casting inspection, machining cells, assembly lines, and the test bench. Frequently Asked Questions
Which wetted materials do I need for chlorine?
For sodium hypochlorite up to 12 percent we recommend PVDF or PTFE liquid ends with EPDM-FFPM gaskets and a degassing valve head. 316L is not suitable for hypochlorite.
Can one motor drive several heads?
Yes. The AF-D drive accepts up to three heads for proportional multi-chemical dosing, common in cooling tower and RO plants.
How accurate is the pump at 10 percent stroke?
Within plus or minus 2 percent at 10 percent turndown and plus or minus 1 percent between 30 and 100 percent. The calibration sheet lists measured points.
Do you supply complete dosing skids?
Yes. Skids include day tank, suction strainer, pulsation damper, back-pressure and relief valves, injection quill, and control cabinet, tested with water before dispatch.
What happens if the chemical crystallizes?
Use the flush-port head option and a dedicated flush sequence; the manual lists flushing intervals per chemical. A heated head is available for sodium chlorite and similar fluids.
Request Your Pump Configuration
Lena Zhao
Sales Engineer, Aquaflow Pumps
Replies within 24 hoursSend your duty point and site details. Lena comes back with a pump selection, a curve match, and a quotation.
Useful details: fluid, flow, head, fluid temperature, voltage and frequency, and any space or noise limits. A photo of the existing installation also helps.
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