Chemical Dosing Pump

What Is a Chemical Diaphragm Dosing Pump?

A chemical diaphragm dosing pump, also known as a diaphragm metering pump, is a positive displacement pump designed to accurately inject chemicals, additives and process fluids into industrial systems. It uses a flexible diaphragm to control liquid flow while separating the pumped medium from the drive mechanism. These chemical metering pumps are widely used for water treatment, wastewater treatment, chemical processing, pharmaceutical manufacturing, agriculture and other applications requiring precise chemical dosing.

Chemical Diaphragm Dosing Pump Features

A reliable chemical diaphragm dosing pump provides accurate dosing performance, chemical resistance and stable operation for various industrial applications.

• Accurate chemical dosing: Positive displacement design provides consistent and controlled liquid injection for reliable chemical metering and feeding.
• Chemical isolation: The diaphragm separates the pumped liquid from the drive mechanism to reduce contamination risks and improve safety.
• Corrosion-resistant construction: Chemical-resistant materials such as PVC pump heads help handle various industrial chemicals and corrosive fluids.
• Controlled dosing: Positive displacement operation provides consistent and controlled chemical injection for different process requirements.
• Continuous operation: Suitable for long-term industrial dosing applications when properly selected, installed and maintained.
• Wide application range: Suitable for water treatment, chemical processing, pharmaceuticals, oil and gas, agriculture and other industries requiring controlled fluid injection.

Chemical Diaphragm Dosing Pump Applications

Chemical diaphragm dosing pumps, also known as chemical injection pumps, are widely used in systems requiring accurate chemical injection and controlled fluid delivery. Their precise metering capability and chemical-resistant design make them suitable for various industrial processes.

• Water Treatment: Used for dosing disinfectants, coagulants, pH adjustment chemicals and other treatment agents in industrial water purification and wastewater systems.
• Chemical Processing: Provides controlled injection of chemicals, additives and process fluids in industrial manufacturing applications.
• Pharmaceutical Manufacturing: Supports precise chemical dosing processes where accuracy and contamination prevention are important.
• Agriculture: Used for fertilizer injection, irrigation systems and agricultural chemical feeding.
• Oil and Gas: Applied for controlled chemical injection in production and processing systems.
• Boiler and Industrial Systems: Used for chemical dosing in boiler water treatment and other industrial process systems.

How to Choose the Right ATO Chemical Diaphragm Dosing Pump?

Selecting the right chemical diaphragm dosing pump (diaphragm metering pump) depends on the required flow rate, pressure rating, chemical compatibility, motor specifications and connection size. ATO offers diaphragm dosing pumps with 50 L/h to 500 L/h flow rates, 0.5 MPa to 1.2 MPa pressure ratings, PVC pump heads and different connection options for accurate chemical dosing.

• Flow Rate: Choose the pump according to the required chemical dosing volume. ATO diaphragm dosing pumps are available from 50 L/h to 500 L/h, with lower flow models for smaller dosing requirements and higher flow models for larger chemical dosing requirements.
• Pressure Rating: Select a pump with sufficient pressure capability to overcome system back pressure. ATO models are available with different pressure ratings, including 1.2 MPa for the 50 L/h model, 0.7 MPa for 80–240 L/h models, and 0.5 MPa for 320–500 L/h models.
• Chemical Compatibility: Check the compatibility between the chemical being transferred and the pump wetted materials. ATO chemical diaphragm dosing pumps feature PVC pump heads and diaphragm structures suitable for chemical metering applications.
• Motor Power and Voltage: Select the motor configuration based on the required dosing capacity and available power supply. ATO models are available with 370W or 550W electric motors and 380V, 50Hz voltage for chemical dosing systems.
• Connection Size: Match the pump inlet and outlet size with the dosing pipeline. ATO models include 6 mm inlet and outlet connections for the 50 L/h model, DN15 connections for 80–240 L/h models, and DN25 connections for 320–500 L/h models.

FAQ

Q1: Do chemical diaphragm dosing pumps require a check valve?
A1: Yes. A check valve is commonly used with chemical diaphragm dosing pumps to prevent backflow and maintain accurate dosing. It helps ensure stable fluid flow and reliable chemical injection performance.​
Q2: Can a chemical diaphragm dosing pump handle corrosive chemicals?
A2: Yes, when the pump materials are properly selected. The diaphragm, pump head and wetted components should be compatible with the chemical being transferred to ensure reliable operation and longer service life.​
Q3: Are diaphragm dosing pumps self-priming?
A3: Most chemical diaphragm dosing pumps are not designed as fully self-priming pumps. The pump chamber and suction line may need to be filled with liquid before operation to achieve accurate dosing performance.​
Q4: How often should a chemical diaphragm dosing pump be maintained?
A4: Maintenance frequency depends on the chemical type and operating conditions. Regular inspection of the diaphragm, valves, seals and connections helps maintain dosing accuracy and extend pump service life.