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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

    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 instead of air-operated

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 designed so that it is not damaged without medium. Starting against an empty line and idle phases in the process are not a damage case.

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 or discharge 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.

Fields of use

Where media become difficult

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

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 industry process plant with pipework and pumpsChemicals & Process IndustryCorrosive media, strict tightness requirements, documented processes: in the chemical industry the pump is a safety component.
Chamber filter press in a sludge dewatering plantWastewater & Environmental TechnologySludge dewatering, changing composition, continuous operation — and a process that must not fail.
Petrochemical plant with columns and pipework in the evening lightOil & GasCritical media, high safety requirements and sites where every service call is demanding.

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. This makes the drive controllable in a defined way; the movement of the diaphragm is guided rather than merely driven by a cushion of air.

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 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. Whether your specific medium is covered is something we clarify on the basis of your data sheet — please get in touch.

What happens if the discharge line is closed?

Nothing. That is exactly the core of the patent-pending design principle: the pump remains protected and takes no damage even with the suction or discharge line closed. An accidentally closed valve is therefore not a reason for failure and does not require a service call.

Can the pump run dry?

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

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.

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