KEY FEATURES

• Approx. 75 L/h nominal dosing capacity at 50 Hz
• 4 bar maximum operating pressure
• Robust positive displacement diaphragm dosing pump
• Mechanically coupled diaphragm drive
• PVC dosing head
• Long-life PTFE-coated diaphragm
• Ceramic (Al₂O₃) valve balls
• PTFE/composite valve seats
• FKM valve gaskets
• Single ball valve design for this flow range
• Handles liquids up to 100 mPa·s viscosity
• Manual stroke-length adjustment with 10:1 adjustment ratio
• Standard inlet and outlet non-return valves
• 19/27 and 20/25 connection size options
• 3 × 230/400 V, 50 Hz three-phase motor
• 0.09 kW power input
• IP65 enclosure rating
• CE, EAC and CNROHSEX approvals

The Grundfos DMX 75-4 is a versatile positive displacement diaphragm dosing pump designed for reliable chemical dosing in industrial and process applications. The DMX 221 series combines robust construction with straightforward mechanical capacity adjustment for dependable dosing performance.

The diaphragm is mechanically coupled through a precise gear-eccenter-tappet system to a high-efficiency AC motor. Dosing capacity can be adjusted by varying the stroke length using the stroke adjustment knob, providing an adjustment ratio of 1:10. The DMX 221 design uses single ball valves from 60 L/h, making this 75 L/h configuration suitable for higher-flow dosing duties.

This configuration features a PVC dosing head, long-life PTFE-coated diaphragm, ceramic Al₂O₃ valve balls, PTFE/composite valve seats and FKM valve gaskets. With a nominal dosing capacity of 75 L/h, maximum operating pressure of 4 bar and compatibility with liquids up to 100 mPa·s viscosity, the pump provides dependable performance for compatible industrial and chemical dosing applications.

ADDITIONAL FEATURES

• Long-life PTFE-coated diaphragm
• Mechanically coupled diaphragm design
• Easy-to-install and operate design
• Chemically resistant thermoplastic pump housing
• Optimum capacity and stroke-frequency graduation
• Dosing flow variation ±1.5% (FS)
• Linearity ±4% (FS)
• Single ball valve design for capacities from 60 L/h
• Standard inlet non-return valve
• Standard outlet non-return valve
• Connection pack for inlet and outlet
• Connection sizes: 19/27 and 20/25
• Maximum permissible inlet pressure of 0 bar
• Liquid temperature range from 0 to 40 °C
• Standard control variant
• Not prepared for VFD operation
• IP65 motor enclosure

APPLICATIONS

• Process engineering, water treatment, wastewater treatment, industrial chemical dosing, chemical treatment, disinfection, pH adjustment and other applications requiring reliable chemical metering at pressures up to 4 bar.

PRODUCT PACKAGE INCLUDES

• Grundfos DMX 75-4 Mechanical Dosing Pump

SPECIFICATIONS

ADDITIONAL RESOURCES

PRODUCT BROCHURE

Additional information about Grundfos DMH Mechanical Dosing Pumps are outlined in the DMH product brochure.

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PRODUCT INFORMATION SHEET (PIS)

Detailed information about the product, is provided in the product information sheet below.

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