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Petrochemische Anlage mit Kolonnen und Rohrleitungen im Abendlicht

Hydraulically operated double diaphragm pumps

HODD® Pumpen

Hydraulically operated double diaphragm pump for demanding applications — several core technologies patent pending.

  • Patent Pending
  • Made in Germany
  • One of a kind
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Ranges

Two models, one principle

Both pumps are built on the same patent-pending drive — designed for two different tasks.

  • HODD Model TP — hydraulically operated double diaphragm pump on its base frame

    Transfer pump

    Model TP

    The transfer pump for media that wear other pumps out: solids-laden, abrasive, corrosive. Hydraulically operated, hermetically sealed, dry-run safe.

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  • HODD Model FP — filter press pump on its base frame in the workshop

    Filter press pump

    Model FP

    The patent-pending solution for filter presses where process stability and result quality matter. Less downtime, more predictability.

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  • In development

    Coming Soon

    The third range is currently in development. We will share details as soon as they are confirmed.

The principle

Hydraulically operated for controlled and gentle power transmission

The diaphragms are moved hydraulically. That makes the drive controllable, the operation quiet and the pump insensitive to precisely those conditions that other designs fail under.

01

Dry-run safe

The pump is absolutely dry-run safe. Not only starting with an empty suction line, but also a sudden closure of the suction line or increased suction resistance will not lead to failure.

02

Protected with the line closed

Thanks to the patent-pending design principle, the pump remains protected and takes no damage even with the suction line closed — a condition that destroys other pumps.

03

Hermetically sealed

The hermetically sealed design provides the highest level of safety when handling critical media. There is no leakage path to the outside via a dynamic seal.

04

Resistant to solids

Designed to resist wear and therefore suitable for slurries containing solids, changing solids contents and abrasive media.

05

Chemically resistant

The wetted parts are made of chemically resistant plastic — the safe choice for corrosive media and aggressive process conditions.

06

Made in Germany

Developed and manufactured in Germany. Several core technologies of the drive are patent pending.

Application areas

Where media become difficult

Abrasive, solids-laden, corrosive or safety-critical — the typical fields of use for the HODD ranges.

Pickling and finishing line in a steelworksSteel industryIn the steel industry, aggressive media, high solids content and rough continuous operation come together — pumps here must be designed as heavy-duty components.
Open-cast mining site at sunset — mining and mineral processingMining & Mineral ProcessingAbrasive sludges, high solids contents, continuous operation: in mineral processing, pump wear is a permanent cost factor.
Chemical plant with tanks and plastic pipeworkChemicals & Process IndustryCorrosive media, strict tightness requirements, documented processes: in the chemical industry the pump is a safety component.
Wet-bench process line with wafers in semiconductor manufacturingSemiconductorsIn semiconductor manufacturing, valuable metals are recovered from corrosive process wastewater — this calls for a process that runs reliably and without interruption.
Metal parts on racks above an electroplating bathSurface finishing & electroplatingElectroplating and surface finishing operations need a simple, reliable solution with low energy costs in wastewater treatment.
Chamber filter press in a sludge dewatering plantWastewater & Environmental TechnologySludge dewatering, changing composition, continuous operation — and a process that must not fail.
Recycling plantRecyclingIn recycling, it is rarely known exactly what is in the material — abrasive, corrosive or toxic — and that is precisely what the hermetically sealed pump is designed for.
Power plantPower generationIn coal and waste incineration power plants, sludges, slag and gypsum suspensions are produced that must be reliably transferred and pressed.
Vineyard with ripe grapes above a river valleyFood & beverageIn food production, the filter press — for example when pressing wine, olives or in sugar production — can be adapted to increased hygiene requirements.
Filter press in ceramics production with light clay slipCeramicsIn ceramics production, the filter cake is not waste but the product — it requires an exact, reproducible residual moisture at consistent quality.
Industrial plantGeneral industryNot every application fits a fixed industry grid — for difficult media and special tasks, an individual inquiry is worthwhile.
Plant engineering and OEM — technical specifications and engineeringPlant engineering & OEM solutionsEvery HODD pump is configured from a modular system to suit the application — with full transparency on the materials used and, where needed, customer-specific right up to a fixed OEM solution.

Frequently asked questions

What is a hydraulically operated double diaphragm pump?

A double diaphragm pump conveys by having two diaphragms displace volume alternately. The medium only touches the diaphragm and the valves, not the drive. At HODD these diaphragms are moved hydraulically instead of by compressed air or mechanically. This makes the diaphragm movement controllable in a defined way; the diaphragm is deflected almost force-free.

How does HODD differ from an air-operated double diaphragm pump (AODD)?

Air-operated double diaphragm pumps are widely used, but compressed air is an expensive form of energy: a large share of the energy applied is also lost on the way from the compressor station to the pump. The hydraulic drive transfers energy directly and therefore works with considerably lower losses. In addition, the diaphragm movement is guided — which has an effect on service life and process stability.

Which media can be conveyed?

The design targets difficult media: slurries containing solids, abrasive sludges, corrosive and aggressive liquids. The wetted parts are made of chemically resistant plastic. Every pump is configured exactly for the application — for maximum reliability and cost-efficiency.

What happens if the discharge line is closed?

The pump can be protected against a discharge-side blockage by an internal hydraulic control or, on the plant side, by a safety valve or an electric pressure switch.

What happens if the suction line is closed?

A suction-side blockage is often a death sentence for conventional pumps. HODD technology safely controls even this extreme condition — damage is prevented by the integrated hydraulic control.

Can the pump run dry?

Yes. The pump is designed to be dry-run safe. Starting against a line that is still empty, air pockets and outgassing, phases without medium at the end of a batch or an emptied vessel do not lead to damage to the unit. Even phases of cavitation can be run through.

Which range is the right one for my application?

Model FP is designed specifically for operation on filter presses — where the pressure rises over the cycle and the solids content changes continuously. Model TP is the transfer pump for moving and conveying difficult media in the running process. Which range fits depends on the application; we will advise you on this directly.

Where are the pumps manufactured?

Development and manufacturing take place in Germany. Several core technologies of the drive are patent pending.

Contact

We are happy to advise you personally — simply send us your enquiry via the form. For reliable sizing it helps us to have details on the medium, solids content, flow rate and pressure requirement.

Enquire