Metering Pump

Metering Pump for Accurate Chemical Dosing and Process Control

OVELL metering pumps are designed for accurate, repeatable and controlled chemical dosing in industrial fluid systems.

A metering pump is a positive displacement pump that delivers a defined volume of fluid during each operating cycle. By controlling stroke length, stroke frequency or motor speed, the pump output can be adjusted to match specific dosing requirements.

Metering pumps are widely used where precise chemical injection is required, including water treatment, chemical processing, lithium battery manufacturing, food processing and industrial production systems.

How Does a Metering Pump Work?

A metering pump moves a controlled volume of fluid through a reciprocating pumping mechanism.

Depending on the pump design, the fluid may be moved by a diaphragm or plunger.

During the suction stroke, process fluid enters the pump chamber through an inlet check valve. During the discharge stroke, the fluid is pushed through the outlet check valve into the process system.

Because each stroke delivers a predictable amount of fluid, the pump can provide accurate dosing when correctly sized and calibrated.

Types of Metering Pumps

Electromagnetic Diaphragm Metering Pump

An electromagnetic metering pump uses a solenoid drive to move a diaphragm.

It is commonly used for low-flow chemical dosing applications such as water treatment, disinfection and pH adjustment.

Mechanical Diaphragm Metering Pump

A mechanical diaphragm metering pump uses a motor-driven mechanism to move the diaphragm.

It is suitable for continuous industrial dosing where stable and repeatable chemical injection is required.

Hydraulic Diaphragm Metering Pump

Hydraulic diaphragm pumps use hydraulic fluid to transfer force to the diaphragm.

This design is suitable for applications requiring higher discharge pressure and enhanced diaphragm protection.

Plunger Metering Pump

A plunger metering pump uses a reciprocating plunger to deliver fluid.

It can provide high discharge pressure and is suitable for applications where precise dosing under high-pressure conditions is required.

Advantages of a Diaphragm Metering Pump

Diaphragm metering pumps provide several advantages for industrial chemical dosing:

• Accurate and repeatable dosing
• Adjustable flow rate
• Leak-resistant process fluid handling
• Good chemical compatibility
• Suitable for corrosive chemicals
• Reliable continuous operation
• Easy integration with automated dosing systems
• Wide operating pressure range

Because the process fluid is separated from the drive mechanism by the diaphragm, diaphragm metering pumps are particularly useful for aggressive or hazardous chemicals.

Metering Pump Applications

OVELL metering pumps can be used for:

• Water treatment chemical dosing
• Wastewater treatment
• Chlorine dosing
• Sodium hypochlorite dosing
• Acid and alkali injection
• pH adjustment
• Coagulant dosing
• Polymer dosing
• Lithium battery chemical dosing
• Chemical processing
• Food and beverage additives
• Cooling water treatment
• Boiler water treatment
• Industrial process chemical injection
• Additive and reagent dosing

Metering Pumps for Water and Wastewater Treatment

Water treatment is one of the most common applications for metering pumps.

Chemical dosing pumps can be used to inject disinfectants, acids, alkalis, coagulants and other treatment chemicals at controlled flow rates.

Typical dosing chemicals include:

• Sodium hypochlorite
• Chlorine solution
• Acids
• Alkalis
• Coagulants
• Flocculants
• Scale inhibitors
• Corrosion inhibitors

Stable chemical dosing helps maintain consistent process conditions and water quality.

Metering Pumps for Lithium Battery Manufacturing

Metering pumps can be used in lithium battery production for controlled dosing of additives, chemical solutions and process fluids.

Accurate dosing is important where chemical ratios, flow consistency and production repeatability affect downstream processing.

Pump materials should be selected according to fluid chemistry, temperature, viscosity and required dosing accuracy.

How to Select the Right Metering Pump

When selecting a metering pump, consider:

• Required dosing flow rate
• Maximum discharge pressure
• Fluid viscosity
• Fluid temperature
• Chemical compatibility
• Required dosing accuracy
• Suction conditions
• Pipeline pressure
• Control method
• Continuous or intermittent operation

The correct pump technology should also be selected according to application requirements.

Low-flow chemical dosing may be suitable for electromagnetic diaphragm pumps, while higher-flow or higher-pressure applications may require mechanical, hydraulic diaphragm or plunger metering pumps.

Metering Pump Flow Control and Automation

Modern metering pumps can be integrated into automated process control systems.

Depending on the pump configuration, flow can be controlled using:

• Manual adjustment
• Pulse signals
• 4–20 mA signals
• PLC control
• Flow feedback
• Process instrumentation

Automated dosing allows the pump output to respond to changing production or water-treatment conditions.

OVELL Metering Pump Solutions

OVELL provides metering pump solutions for accurate chemical dosing and industrial process control.

Available configurations can be selected according to flow rate, operating pressure, chemical compatibility and control requirements.

For pump selection, provide the chemical name, required dosing flow rate, discharge pressure, concentration, viscosity, temperature and control method so that an appropriate metering pump can be recommended.

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