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Pumps

Air-operated diaphragm pumps

AODD pumps (air operated double diaphragm): self-priming, dry-run safe, ATEX-suitable — for almost any medium.

Air-operated diaphragm pumps use two diaphragms linked by a shaft and driven by compressed air. They prime dry, are safe against blocking and dry running, are infinitely adjustable via air pressure and handle thin, viscous, abrasive or solids-laden media.

As they need no electric motor, they are ideal for hazardous areas. Available in plastics (PP, PVDF, PTFE), aluminium and stainless steel with diaphragms in Santoprene, NBR, EPDM, Viton® or PTFE.

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Technical features

  • Dry self-priming and dry-run safe
  • Deadhead safe — can run against a closed valve
  • Infinitely variable control via air pressure and volume
  • ATEX versions without electric drives
  • Housings in PP, PVDF, PTFE, aluminium and stainless steel
  • Handles solids and abrasive media

Typical applications

  • Chemicals and acids in the process industry
  • Paints, coatings and printing inks
  • Adhesives, resins and viscous media
  • Food and beverage transfer
  • Wastewater, sludge and solids-laden media
  • Drum and IBC emptying

Designs and materials

AODD pump DN 25 (1 inch) in stainless steel
ATEX-suitable air-operated diaphragm pump, metal design
Air-operated diaphragm pump 1 inch DN 25 in polypropylene

AODD — air operated double diaphragm

Robust air-operated diaphragm pumps for almost any medium

Two diaphragms connected by a shaft are moved alternately by compressed air. The result is hermetically separated, self-priming delivery without shaft seal and without an electric drive in the product area.

Air-operated diaphragm pumps prime dry, are deadhead safe and can be controlled infinitely via air pressure. This makes them the most universal pump type for difficult media and hazardous areas.

Materials

Housings

  • Polypropylene (PP)
  • PVDF
  • PTFE-lined
  • Aluminium
  • Stainless steel 1.4401 (AISI 316)

Diaphragms

  • Santoprene
  • Nitrile (NBR)
  • EPDM
  • Viton®
  • PTFE

Operational advantages

  • Dry-run safe and deadhead safe
  • No electrics at the point of use — ATEX suitable
  • Handles solids and abrasive media
  • Portable and quickly redeployed
  • Simple maintenance with few wear parts

Shop and further information

Standard pumps and spare parts are available directly in our pump shop. Detailed technical information on AODD pumps is collected on our dedicated specialist site.

Diaphragm pumps in the shopaodd-pumpen.de — info portal

Air-operated diaphragm pumps (AODD) in practice

AODD pumps are the all-purpose tool in chemical and wastewater applications: they run dry, self-prime, tolerate solids and can be dead-headed. The price is a pulsating flow and noticeable air consumption – both manageable with a pulsation damper and correctly sized air line.

  1. Size the air line at least to the nominal air inlet diameter
  2. Install a service unit with water separator upstream
  3. Mount the pulsation damper on the discharge side directly at the pump
  4. Provide diaphragm rupture detection for critical media

As Versamatic distributor Germany we supply pumps, diaphragms and service parts from stock and support the selection of the right material pairing. Brand page: Versamatic distributor Germany; related designs are gear pumps and dosing pumps.

Related topics and brands

Direct links to the matching pump and nozzle categories as well as our distributor pages for Flojet, Delavan and Versamatic.

Frequently asked questions

Why choose an air-operated diaphragm pump?
It is dry-run safe, self-priming, infinitely adjustable via air supply and works without electricity – ideal in hazardous areas and with solids-laden or highly viscous media.
Which diaphragm materials are available?
Santoprene, NBR, EPDM, neoprene, Hytrel and PTFE. PTFE offers almost universal chemical resistance, Santoprene the longest service life with aqueous media.

Related pages

Pumps overviewMetering pumpsImpeller pumpsSend a request