Grundfos DMH Hydraulic Diaphragm Dosing Pumps

Grundfos DMH Mechanical Dosing Pumps for Chemical Metering, High-Pressure Dosing, Water Treatment, and Industrial Process Applications

Hydraulic Piston Diaphragm Dosing Pumps for Reliable Chemical Feed in Demanding Systems

Grundfos DMH Mechanical Dosing Pumps are hydraulic piston diaphragm dosing pumps designed for demanding chemical metering applications where reliability, dosing accuracy, and high-pressure capability are required. Built for industrial water treatment, process engineering, chemical feed, disinfection, and conditioning applications, the DMH range is suited for systems that need robust dosing performance under challenging operating conditions.

Unlike smaller digital dosing pumps that are often selected for lower-flow chemical feed, DMH pumps are built for heavy-duty mechanical dosing where higher pressures, larger dosing ranges, and long service life are important. Their hydraulic diaphragm design helps provide smooth dosing without pressure peaks, while protecting the mechanical drive from direct contact with the dosed liquid.

Grundfos DMH pumps are available in a wide range of configurations to suit different dosing requirements, chemicals, operating pressures, and system layouts. Depending on the selected model, options may include manual stroke length adjustment, electric servomotor stroke adjustment, diaphragm failure indication, special dosing heads, stainless steel wetted components, pressure relief features, and hydraulic chamber degassing.

Features

• Hydraulic piston diaphragm dosing pump design
  
• Built for demanding chemical metering and industrial dosing applications
• Designed for reliable dosing and high-pressure capability
• Suitable for process engineering, water treatment, and industrial chemical feed
• Full-PTFE dosing diaphragm supports broad chemical compatibility
• Hydraulic diaphragm design helps support smooth dosing without pressure peaks
• Mechanical drive is separated from the dosed liquid
  
• High dosing accuracy and linear dosing curve depending on model configuration
• Manual stroke length adjustment available
• Electric servomotor stroke adjustment available on select configurations
• Diaphragm failure indication available on select configurations
• Special dosing head options available for different chemical requirements
• Stainless steel wetted component options available
• Integrated pressure relief valve available on select models
• Hydraulic chamber degassing valve available on select models
• Active diaphragm protection available on select models
• ATEX-certified configurations available for suitable hazardous-area applications
• DMH-API configurations available for industrial applications requiring API 675-oriented features
  
• Suitable for high-pressure dosing applications up to 200 bar in specific DMH configurations
  
• Designed for long lifetime in demanding high-pressure chemical dosing service

Applications

• Chemical metering
• Industrial process water treatment
• Water treatment chemical feed
• Wastewater treatment chemical dosing
• High-pressure chemical dosing
• Disinfection chemical feed
• pH correction
• Acid and caustic dosing
• Coagulant and flocculant dosing
• Antiscalant dosing
• Corrosion inhibitor dosing
• Boiler water treatment
• Cooling water treatment
• Process engineering systems
• Chemical manufacturing and handling
• Oil, gas, and petrochemical dosing applications
• Industrial plants requiring robust mechanical dosing pumps