Metering dosing pumps are precision devices used to deliver exact amounts of fluids (liquids or chemicals) into a process stream. They’re crucial in industries that require accurate chemical dosing, such as water treatment, pharmaceuticals, food and beverage, oil and gas, and manufacturing.

Specifications to Consider

Key Features

• Accuracy: Delivers fluids at a controlled rate (e.g., ml/hr to L/hr).

• Adjustability: Flow rate and pressure are adjustable.

• Repeatability: Maintains consistent dosing over long periods.

• Material Compatibility: Built from corrosion-resistant materials like PVC, stainless steel, or PTFE to handle aggressive chemicals.

How They Work

Metering pumps operate on positive displacement principles. A set volume is drawn into a chamber and then pushed out with each cycle. Common types include:

1. Diaphragm (Hydraulic or Mechanical)

• Uses a flexible diaphragm driven by a motor or hydraulic fluid.

• Good for handling corrosive or hazardous fluids.

2. Piston/Plunger

• Uses a reciprocating piston.

• Higher pressures but not ideal for abrasive or slurry fluids.

3. Peristaltic

• Fluid moves through a tube by rollers.

• Excellent for shear-sensitive or viscous fluids.

Applications

• Water and Wastewater Treatment: Chlorine, pH adjusters.

• Chemical Processing: Acids, bases, solvents.

• Pharmaceuticals: Ingredient dosing.

• Food & Beverage: Flavoring, color, preservatives.

• Boiler Feedwater: Anti-scalants, oxygen scavengers.

Maintenance Tips

• Regularly check seals and diaphragms for wear.

• Flush the system when switching chemicals.

• Calibrate periodically to ensure dosing accuracy.

• Use backpressure and pulsation dampeners if needed.