Chemical AODD Pumps

Need help specifying the right AODD pump? Contact our pump experts today!

Enquire now Call us 01773 533 283

Minimise Process Downtime With Our Chemical Diaphragm Pumps

Looking for a "Fit and Forget" pump solution for your chemical pump process? Our range of chemical AODD pumps have no seals to wear and leak your hazardous fluid, can dry run without damage, have patented stall protection to limit downtime and worker intervention when pressure imbalances occur, and are built with 50% fewer wearing parts compared to alternatives for low cost maintenance. So, if you feel it's time to leave your engineers to do more value-adding tasks than running a pump, AODD pumps are the perfect solution for you! Thanks to the wide range of materials the diaphragm are available in and their ability to handle low and high viscosity fluids, including those with solid content, Castle Pumps will have an air operated diaphragm pump compatible with your chemical, acid or corrosive fluid. If you have air on site and this sounds like a solution for you, contact our pump experts for your AODD pump quotation.

products

FAQs

The pump is made up of two chambers. As the air forces the diaphragm to move in to the one chamber it forces the fluid inside into the outlet, whilst the other chamber fills up with fluid drawn from the inlet. As the diaphragm moves back into the opposite chamber, the fluid now in that chamber is forced out and the other chamber begins to fill up.

Ensuring compatibility with the fluid being pumped is a vital part of AODD pump specification to avoid swelling, erosion and even melting of the casing, diaphragm and balls. Our AODDs are available in PP, Aluminium or Stainless Steel and diaphragms in PTFE, EPDM, NBR, Hytrel and Santoprene. Upon disclosure of the fluid you are handling we will establish the best solution.

Thanks to the absence of a mechanical seal that needs cooling and lubricating, AODDs are able to run dry or against a closed discharge indefinitely without causing damage to the pump.

AODD pumps are very versatile in their ability to handle aggressive fluids, solids and viscous liquids, and their seal-less design meaning less leaks makes them ideal for hazardous fluids. They are however limited to the fact that they require a compressed air supply to be on site to operate the pump.

There are four common installation types. 1. Above the fluid as it is self priming. 2. Drum/tank mounted 3. Immersed (with an exhaustn tube vented to the atmoshpere) 4. Below the fluid with flooded suction

Yes! Whereas with an electric motor you would fit a variable speed drive, with an AODD you can simply adjust the air inlet pressure to control the flow you receive the other end.

Yes, air operated diaphragm pumps have excellent suction capabilities without need for a manual priming device.

Yes. Thanks to the absence of any close fitting or rotating parts, AODD pumps can handle solid content in fluids.

Yes this is absolutely something to consider for chemical transfer pumps! A material’s resistance to a chemical can change depending on the concentration of the chemical and the temperature. For example, Hastelloy C is compatible with Sulphuric Acid at 98% concentration and up to 60°C, but at 80% Hastelloy C is only compatible up to 20°C.