Grundfos DMX Mechanical Diaphragm Dosing Pumps for Water Treatment
The Grundfos DMX range delivers proven mechanical diaphragm dosing technology for precise chemical metering across water treatment, industrial process, and agricultural applications. Covering flow rates from 0.4 l/h up to 2 × 4000 l/h at pressures from 3 to 10 bar, the DMX series combines robust construction with exceptional accuracy (±1.5% flow fluctuation) for reliable, low-maintenance dosing of coagulants, disinfectants, and process chemicals.
As an authorized Grundfos Water Pump Dealer in Dubai, we supply the complete Grundfos DMX dosing pump range with genuine warranty and technical support across the UAE.
Performance Range Overview
| Model | Flow Range (50 Hz) | Pressure Range |
|---|---|---|
| DMX 221 | 0.4–115 l/h | 3–10 bar |
| DMX 226 | Up to 765 l/h | 3–10 bar |
| DMX 227 | Up to 2000 l/h (2×4000 l/h duplex) | 3–5 bar |
DMX 221 Performance Data (50 Hz)
| Model | Max Flow (l/h) | Max Pressure (bar) |
|---|---|---|
| DMX 221 50-10 | 50 | 10 |
| DMX 221 75-4 | 75 | 4 |
| DMX 221 115-3 | 115 | 3 |
DMX 226 Performance Data (50 Hz)
| Model | Max Flow (l/h) | Max Pressure (bar) |
|---|---|---|
| DMX 226 190-10 | 190 | 10 |
| DMX 226 280-8 | 280 | 8 |
| DMX 226 224-5 | 224 | 5 |
| DMX 226 460-6 | 460 | 6 |
| DMX 226 765-3 | 765 | 3 |
DMX 227 Performance Data (50 Hz)
| Model | Max Flow (l/h) | Max Pressure (bar) |
|---|---|---|
| DMX 227 1120-5 | 1120 | 5 |
| DMX 227 2000-3 | 2000 | 3 |
Duplex versions available with double flow capacity (up to 2 × 4000 l/h)
Dosing Accuracy Specifications
| Parameter | DMX 221 & 226 | DMX 227 |
|---|---|---|
| Flow Fluctuation | ±1.5% | ±2% |
| Linearity Deviation | ±4% | ±4% |
Material Options by Model
DMX 221 Dosing Head Materials:
| Material | Description |
|---|---|
| PP | Polypropylene |
| PVDF | Polyvinylidene fluoride |
| PVC | Polyvinyl chloride |
| Stainless Steel | 1.4571 (EN 10027-2), 316Ti (AISI) |
DMX 226 Dosing Head Materials:
| Material | Description |
|---|---|
| PP | Polypropylene |
| PVDF | Polyvinylidene fluoride |
| PVC | Polyvinyl chloride |
| Stainless Steel | 1.4571 (EN 10027-2), 316Ti (AISI) |
DMX 227 Dosing Head Materials:
| Material | Description |
|---|---|
| PP | Polypropylene |
| PVC | Polyvinyl chloride |
| Stainless Steel | 1.4571 (EN 10027-2), 316Ti (AISI) |
Gasket & Valve Materials
Gasket Materials:
| Model | Available Materials |
|---|---|
| DMX 221 | EPDM, FKM, PTFE |
| DMX 226 | EPDM, FKM, PTFE |
| DMX 227 | EPDM, FKM |
Valve Ball Materials:
| Model | Available Materials |
|---|---|
| DMX 221 | Glass, PTFE, Ceramic, Stainless Steel 1.4401 |
| DMX 226 | Glass, PTFE, Ceramic, Stainless Steel 1.4401 |
| DMX 227 | PVC, PP, Stainless Steel 1.4401 |
Valve Types:
| Model | Valve Configuration |
|---|---|
| DMX 221 | Standard (not spring-loaded) or Spring-loaded 0.8 bar (discharge) |
| DMX 226 | Standard (not spring-loaded) or Spring-loaded 0.8 bar (discharge) |
| DMX 227 | Spring-loaded both sides (0.1 bar) |
Diaphragm Construction
| Component | Material |
|---|---|
| Diaphragm Base | NBR (Nitrile Butadiene Rubber) |
| Diaphragm Coating | PTFE |
The PTFE-coated NBR diaphragm provides excellent chemical resistance while maintaining flexibility and durability for long service life.
Key Features & Benefits
Accurate Dosing – All the Time The diaphragm design ensures dosing flow fluctuation of ±1.5% (DMX 227: ±2%) and linearity deviation of ±4%, enabling precise chemical metering—as much as necessary, as little as possible.
Smooth and Low-Pulsation Dosing Sophisticated drive technology and gear kinematics ensure smooth, low-pulsation dosing without pressure peaks. This reduces stress on system components including tubes and valves, extending service intervals for the entire system.
Compact Design Saves Money and Space Available in 12 different dosing head sizes, the compact design allows placing multiple pumps side-by-side in confined spaces. Double-head versions (DMX 226 and 227) offer cost-efficient solutions for dosing two chemicals or achieving higher flow rates.
Perfect Material Selection Smaller DMX models feature plastic housings with chemical resistance for many applications. Larger models have robust cast-aluminium housing with epoxy coating. Wide material choices for dosing heads, valves, and accessories allow selecting exactly the chemical resistance required.
Motors and VFD for Application Needs For specific motor requirements, the DMX range offers Ex-classified or ATEX-certified high-quality motors. The Variable Frequency Drive (VFD) provides analog and digital signal inputs/outputs plus field bus communication interfaces (Profibus, Profinet).
Housing Construction
| Model Range | Housing Material |
|---|---|
| Smaller DMX Models | Plastic (chemical resistant) |
| Larger DMX Models | Cast aluminium with epoxy coating |
Available Options
All Models:
- Diaphragm leakage detection
- Integrated relief valve (PVDF and PVC variants)
Accessories:
- AR control electronics
- Integrated relief valve
- Dosing controller
- Diaphragm leakage detection
- Servomotor for automatic stroke-length adjustment
- PTC motors with Variable Frequency Drive (VFD)
- Pressure-loading valves
- Pulsation dampers
Motor Options:
- Standard motors
- Ex-classified motors
- ATEX-certified motors
- PTC motors with VFD
VFD Features:
- Analog signal inputs/outputs
- Digital signal inputs/outputs
- Field bus interface (Profibus, Profinet)
Applications
Water Treatment:
- Drinking water treatment (disinfection, pH adjustment)
- Wastewater treatment (coagulation, flocculation)
- Cooling tower water treatment
- Low-pressure boiler feed water treatment
- Cleaning water treatment
Industrial Processing:
- Pulp and paper industry
- Textile industry
- Food and beverage industry
- Dairies
Agricultural:
- Irrigation
- Fertigation
- Agricultural chemical dosing
Treatment Processes:
- Disinfection
- Coagulation
- Flocculation
- Precipitation
- pH control
- Chemical conditioning
Model Selection Guide
| Application | Recommended Model | Typical Chemicals |
|---|---|---|
| Small-scale disinfection | DMX 221 | Hypochlorite, chlorine dioxide |
| Medium water treatment | DMX 226 | Coagulants, flocculants |
| Large municipal treatment | DMX 227 | Ferric chloride, lime slurry |
| Dual chemical dosing | DMX 226/227 Duplex | Multiple chemicals |
| High-pressure applications | DMX 221 50-10 | Concentrated acids/alkalis |
| High-flow, low-pressure | DMX 227 2000-3 | Dilute solutions |
Frequency Options
| Frequency | Availability |
|---|---|
| 50 Hz | Standard |
| 60 Hz | Available (see data booklet) |
| 100 Hz | Available (see data booklet) |
Why Choose Grundfos DMX?
Proven Reliability The DMX range has demonstrated its worth in dosing applications worldwide, delivering consistent performance with minimum maintenance requirements.
Exceptional Accuracy ±1.5% flow fluctuation ensures precise chemical dosing for optimal process control and chemical cost savings.
Low Pulsation Smooth dosing without pressure peaks extends the life of downstream components and reduces system stress.
Flexible Configuration 12 dosing head sizes, multiple materials, and single or double-head configurations meet diverse application requirements.
Low Running Costs Wide material selection allows choosing exactly the chemical resistance needed, keeping spare parts costs low over the equipment lifetime.
Advanced Integration VFD options with Profibus and Profinet interfaces enable seamless integration with plant automation systems.
Genuine Grundfos Accessories & Parts
Complete your DMX installation with genuine Grundfos accessories including suction lances, foot valves, injection valves, pulsation dampers, pressure-loading valves, diaphragm kits, valve assemblies, and AR control electronics. We stock components for complete chemical dosing solutions.
Select Grundfos Pumps
Browse our complete inventory of Grundfos DMX mechanical diaphragm dosing pumps. As Grundfos Pump Suppliers in Dubai, we provide competitive pricing, technical consultation, and prompt delivery across Dubai, Sharjah, Abu Dhabi, Ajman, and all UAE locations.
Contact us for:
- DMX model selection based on flow and pressure
- Dosing head material recommendations
- Chemical compatibility guidance
- Single vs duplex configuration advice
- VFD and motor options
- ATEX-certified solutions
- Competitive quotations
- Delivery schedules
Precision Chemical Dosing You Can Rely On
The Grundfos DMX mechanical diaphragm dosing pump range delivers the accuracy, reliability, and flexibility that water treatment and industrial dosing applications demand. With flow rates from 0.4 l/h to 4000 l/h, pressures up to 10 bar, and ±1.5% dosing accuracy, the DMX ensures precise chemical metering for optimal process performance and cost-effective operation.