DMH hydraulic piston diaphragm dosing pump

Overview

Overview

General

The Grundfos DMH range is a series of extremely strong, robust pumps for applications requiring a reliable dosing and high-pressure capability, such as process engineering. The DMH 28x has been especially designed for high-pressure applications from 50 up to 200 bar. The range is highly versatile: it covers a wide flow range and offers a variety of dosing head sizes, materials and accessories. Customers worldwide have enjoyed years of trouble-free operation from their DMH pumps.

Accurate dosing - all the time

DMH pumps have a very high dosing accuracy and allow an exact reproducibility. The dosing flow variation and linearity deviation are below 1 % of the rated flow, especially at high pressures.

Smooth and low-pulsation dosing

The DMH range combines sophisticated drive technolo­gy and gear kinematics to ensure smooth and low-pulsation dosing without pressure peaks. This means less stress to all system components, such as tubes and valves, and leads to longer service intervals for the entire system.

Motors to match application needs

For applications with specific motor requirements, the versatile DMH range offers high-quality motors for 50 Hz, 60 Hz, 100 Hz (with Variable Frequency Drive VFD), as well as EX classified or ATEX-certified motors, if required.

Perfect material selection - for housing and liquid-wetted parts

The DMH models have a robust cast-aluminium housing with epoxy coating to meet all application needs (grey cast-iron if API 675 is required). Investment costs and running costs for spare parts are kept low over the years: A wide choice of materials for dosing head, valves and accessories allow selecting exactly the degree of chemical resistance required. All liquid-wetted parts need to be resistant to the chemicals used. The diaphragm is made of full-PTFE material.

Safe and trouble-free operation

The serially integrated pressure relief valve and active diaphragm protection system (AMS) keep the pump and entire system protected against overpressure, if the discharge line is blocked. In addition, the degassing valve at the pump guarantees high functional safety of the pump, the installation and the whole process. Due to aluminium enclosure and the piston diaphragm technology, DMH pumps have a very long operating life and long service intervals.

Approvals and certificates

For potentially explosive areas we offer EX classified or ATEX-certified motors and pumps. For applications in the petro chemistry we provide special versions of our DMH dosing pumps with API 675 certificates.

Flexibility - in pump configuration and applications

A number of different product configurations are available to match requirements: Flexible control concept for flow rate: manual or automatic stroke-length adjustment with electric servomotor. Pumps fitted with double diaphragm with failure indication, or special dosing heads with electrical heating. Universal fields of application are possible for this pump series due to the full-PTFE dosing diaphragm. Wetted parts are available in material combinations that suit virtually all dosing tasks. Choose the best configuration for your specific dosing task.

Ready for tough application areas

Power plants - Dosing of ammonia, hydrazine, phosphates in high-pressure areas (boiler feed water); or dosing of various chemicals for treatment of cooling water and process water

Petrochemical/oil industry, refinery - Dosing of wax, inhibitors and anticorrosion chemicals to protect oil pipelines; dosing of inhibitors, additives and catalysts; dosing of chemicals for treatment of cleaning water and process water

Treatment of process water and drinking water - Rough environments (hot climate, desert, outdoor installations); at higher flow and pressure ratings

EX zones - ATEX Directive (94/9/EC), Group II, category 2 (zone 1/21) and Group II, Category 3 (Zone 2/22) Dosing of flammable liquids.


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Benefits

  • High pressure dosing up to 200 bar
  • Very accurate dosing
  • Full PTFE membrane as a standard
Contact
Sales office

Contact us

Select country to contact your local sales company


Telephone

+2710 248 6000

Address

16 Lascelles Road, Meadowbrook, Germiston

Service center

Contact us

Select country to contact your local sales company


Telephone

+2710 248 6000

Address

16 Lascelles Road, Meadowbrook, Germiston