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Grundfos DMH 21-25 Mechanical Dosing Pump 21 L/h 25 Bar
Grundfos DMH 21-25 Mechanical Dosing Pump 21 L/h 25 Bar
Vendor: Grundfos
Unavailable
KEY FEATURES
- Approx. 21 L/h nominal dosing capacity at 50 Hz
- 25 bar maximum operating pressure
- Robust positive displacement diaphragm dosing pump
- Stainless steel EN 1.4571 dosing head
- Stainless steel EN 1.4401 valve balls
- Stainless steel EN 1.4571 valve seats
- FKM valve gasket
- Handles liquids up to 50 mPa·s viscosity
- Manual stroke-length adjustment with 10:1 adjustment ratio
- 3 × 230/400 V, 50 Hz three-phase motor
- IP65 enclosure rating
- 1/4-inch Rp inlet and outlet connections
- CE, EAC and CNROHSEX approvals
The Grundfos DMH 21-25 is a versatile positive displacement diaphragm dosing pump designed for reliable chemical dosing in demanding industrial and process applications. The DMH range is engineered for robust operation where dependable dosing performance at high operating pressures is required.
The diaphragm is hydraulically 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.
This configuration features a stainless steel EN 1.4571 dosing head, stainless steel valve components, an FKM valve gasket and a long-life PTFE diaphragm. Its robust industrial construction and straightforward operating design make it suitable for demanding process environments requiring reliable chemical metering at pressures up to 25 bar.
ADDITIONAL FEATURES
- Long-life PTFE diaphragm
- Easy-to-install and operate design
- Aluminium pump housing
- Optimum capacity and stroke-frequency graduation
- Dosing flow variation ±1.5% (FS)
- Linearity ±2% (FS)
- Standard inlet and outlet non-return valves
- 1/4-inch Rp inlet and outlet connections
- Maximum permissible inlet pressure of 8 bar
- 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 25 bar.
PRODUCT PACKAGE INCLUDES
- Grundfos DMH 21-25 Mechanical Dosing Pump
SPECIFICATIONS
| Specification | Details |
|---|---|
| Product Name | Grundfos DMH 21-25 |
| Model / Configuration | DMH 21-25 B-SS/V/SS-X-E1AAXEMAG |
| Pump Type | Positive displacement diaphragm dosing pump |
| Nominal Flow Rate | 21 L/h at 50 Hz (approx. 5.55 US GPH) |
| Maximum Operating Pressure | 25 bar (approx. 362.6 psi) |
| Number of Dosing Heads | 1 |
| Maximum Viscosity | 50 mPa·s |
| Pump Housing | Aluminium |
| Dosing Head Material | Stainless steel EN 1.4571 |
| Diaphragm | PTFE |
| Valve Ball Material | Stainless steel EN 1.4401 |
| Valve Seat Material | Stainless steel EN 1.4571 |
| Valve Gasket Material | FKM / Rubber |
| Inlet Non-Return Valve | Standard |
| Outlet Non-Return Valve | Standard |
| Inlet Connection | Rp |
| Outlet Connection | Rp |
| Inlet Connection Size | 1/4 inch |
| Outlet Connection Size | 1/4 inch |
| Maximum Permissible Inlet Pressure | 8 bar (approx. 116 psi) |
| Liquid Temperature Range | -10 to 90 °C |
| Power Input (P1) | 0.09 kW (approx. 0.121 HP) |
| Rated Voltage | 3 × 230/400 V |
| Frequency | 50 Hz |
| Maximum Frequency | 50 Hz |
| Enclosure Class | IP65 |
| Control Variant | Standard |
| Frequency Converter | Not prepared for VFD |
| Cable Included | No |
| Power Plug | No plug |
| Diaphragm Leakage Detection | No |
| Net Weight | 14 kg (approx. 30.9 lb) |
| Gross Weight | 25.3 kg (approx. 55.8 lb) |
| Shipping Volume | 0.156 m³ |
| Approvals | CE, EAC, CNROHSEX |
ADDITIONAL RESOURCES
PRODUCT BROCURE
Additional information about Grundfos DMH Mechanical Dosing Pumps are available in the DMH product leaflet.
DATASHEET
Detailed specifications for the Grundfos DMH 21-25 Mechanical Dosing Pump 21 L/h 25 Bar are available in the datasheet below.
Additional technical data about the Grundfos DMH Mechanical Dosing Pumps are available in the product datasheet.
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