Key Benefits

  • Able to transfer anything that can move through a pipe
  • Capable of indefinite dry operation
  • Extremely low maintenance
  • Fully adjustable under operation
  • Usable under extreme conditions

ODS Diaphragm Pumps - top performance under the toughest conditions

When you have viscous materials to move, the last thing you want to worry about is whether or not your pump system is up to the task.

ODS Diaphragm Pumps are designed incorporating decades’ worth of experience in slurry and sludge handling technology, to create a durable, easy-to-use pump solution that can handle any materials in essentially any conditions. And thanks to its unique design, the pump is capable of operating for significantly longer than other pumping solutions with very little maintenance attention.

What materials can it pump?

ODS Diaphragm Pumps can handle what other systems cannot. These pump solutions can transfer anything that moves through a pipe, including:

  • Delicate crystal slurries
  • Highly concentrated and unusually viscous slurries
  • Highly abrasive slurries
  • Highly corrosive slurries
  • Very large solids in slurries
  • Extremely volatile slurries
  • Delicate and unstable slurries
  • Air-entrained slurries
  • Shear-sensitive liquids

Backed by expert process and equipment know-how

So much depends upon your pump system; it only makes sense to work with an equipment supplier who understands your needs. As the market leading supplier of engineering, equipment and service solutions throughout the mining industries, FLSmidth knows pumps. Our ODS Diaphragm Pump is one of the most unique, technologically advanced and dependable pumps available on the market today. We know how best to meet your plant’s unique requirements, and as the OEM we provide the technology to make it happen.


Don’t settle for a sub-par pump solution. Contact FLSmidth, and see how the world’s most powerful and reliable pumps can boost your business.

Dependable and easy to use under any conditions: ODS Diaphragm Pumps

Able to transfer anything that can move through a pipe
No matter what you have to move, ODS Diaphragm Pumps are capable of getting the job done without clogging or failing.
Capable of indefinite dry operation
ODS Diaphragm Pumps cannot air bind — they have no stator to burn out and no seal to fail.
Extremely low maintenance
ODS Diaphragm Pumps’ unique design allows for continuous, year-over-year operation with only minimal maintenance.
Fully adjustable under operation
ODS Diaphragm Pumps can be easily adjusted, allowing for unrivaled flexibility for both capacity and discharge pressure.
Usable under extreme conditions
From corrosive materials to abrasives, and even in extreme temperatures of up to 93.3°C (200°F), ODS Diaphragm Pumps can handle sludge and slurries containing up to 75% solids in conditions that would be impossible for traditional pump designs. 

Superior design for heavy-duty performance: ODS Diaphragm Pumps

Tough slurries demand unique solutions, and unique solutions require new designs.

The ODS is an air-operated diaphragm pump. Because it’s a diaphragm pump, it is superior to centrifugal and helical screw pumps for heavy-duty performance. This air-operated design is a significantly improvement over mechanically or hydraulically operated models, due to its simplicity of control and evenly distributed power transmission. And because it is designed and built for truly long-term, heavy-duty performance, you’ll enjoy improved throughput and optimal results for years to come. It weighs more – two or three times more than air-operated double diaphragm pumps – lasts longer, and pumps the slurries that no other unit can handle. In terms of durability and dependability, no other unit comes close.


How it works

Basic non-assist pump – fill stroke

Electrical impulses from an adjustable timer alternately open and close solenoid-controlled air valves, which admit and exhaust air from the diaphragm cavity. Positive suction head (inlet pressure) lifts inlet valve A, allowing the slurry to completely fill the pump cavity. The diaphragm lifts to its normal convex position and the air exhausts. Discharge valve B, seated by line pressure, prevents discharged slurry from returning to the pump cavity. Positive suction head must be 2 PSI above the pump diaphragm centerline level pressure.

Basic non-assist pump – discharge stroke

Compressed air then enters the chamber from the top, causing the diaphragm to gradually descend and increase the pressure in the pump cavity. Inlet valve A closes and discharge valve B opens as the pressure line is exceeded. The descension of the diaphragm displaces the slurry from the pump cavity with pumping action that is positive yet gentle, so that delicate crystals and slurries can be transferred or metered without damage.

For applications requiring suction lift, a spring-assist or air-cylinder-assist model may be used.


Spring-assist ODS pump

In this version of the basic pump, a spring-actuated rod mechanically lifts the diaphragm, causing the slurry to enter the pump cavity. The discharge cycle, which is the same as in the basic pump, compresses the spring as air pressure drives the diaphragm downwards.

We recommend this self-priming model for applications in which:
  • Suction lift is up to 3 m (10 feet)
  • Normal capacity is increased up to 50% due to faster filling action
  • Slurries with high solids concentration and high viscosity can be handled.

Air-cylinder-assist ODS pump

This version of the basic pump employs an air-cylinder-actuated rod to mechanically lift the diaphragm. Following the lift stroke, air for the discharge stroke enters the diaphragm chamber, lowers the diaphragm, and drives the slurry out of the pump cavity – simultaneously returning the air piston to the lower position.

We recommend this model for applications requiring suction lift up to 6 m (20 feet).



How you operate your pump system is at least as important as how the system itself functions. That’s why we offer our expertise in helping you determine the most cost-effective controllers to fit you application – without compromising quality or dependability.


With ODS Diaphragm Pumps, an adjustable, variable timer controls the solenoid valve operation to set the number of pumping cycles per minute, as well as the discharge portion length for each cycle. Housed in a protective NEMA Type 4 fiberglass enclosure with a hinged cover, the timer is offered in several designs and can be automated for paced control in response to a 4-20 MA signal.

Available pump operation options include:

  • Single pump controller (standard)
  • Multi-range with contacts for remote start/stop
  • 4-20 MA automated controller
  • Synchronisation for 2 units in parallel
  • Multi-pump controller
  • Remote or linear response timers
  • Solid state electronic or PLC controls with a variety of timing ranges and options, such as stroke counters and terminals for remote operation
  • Automatic pressure control system to feed a plate and frame filter press via single or multiple feed pumps


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