ODS® Diaphragm Pump

ODS Pump

For Industrial And Municipal Applications

What it is.....

The ODS® is an air-operated diaphragm pump. Because it is a diaphragm pump, it is superior to centrifugal and helical screw pumps for heavy-duty performance. Because it is an air-operated diaphragm, it is significantly superior to mechanically or hydraulically operated models due to its simplicity of control and evenly distributed power transmission.
The ODS® pump, is superior to other air-operated diaphragm models because it is designed and built for truly long-term, year-in-year-out, heavy-duty performance. 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. There is no truly equivalent unit.

What can it pump?

It will efficiently transfer anything that moves through a pipe such as:

  • 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.

Additional advantages

  • The ODS® Pump can be automated to match capacity to process requirements for maximum process efficiency.
  • The ODS® Pump's construction allows it to be operated dry, indefinitely. It cannot air bind, has no stator to burn out and no seal to fail.
  • The ODS® Pump has no seal, so contamination of process slurry or the environment from seal leaks is not possible.
  • The ODS® Pump is adjustable while in operation for maximum flexibility for both capacity and discharge pressure.
  • The ODS® Pump is a low maintenance pump - once installed it requires almost no attention.
  • The ODS® can handle tough corrosives, abrasives, temperatures up to 200°F, and slurries containing up to 75% solids. The rhythmic plunger-type action minimizes particle degradation of even the most delicate materials. Operation is completely leak-proof.

How The ODS® Pump works...

The non-assist ODS® Pump

Fill Stroke
To fill the pump cavity, positive suction head (inlet pressure) is required. When inlet valve A is lifted by the pressure of the suction head, the slurry completely fills the pump cavity. The diaphragm returns to its normal convex position and the air exhausts. Discharge valve B, seated by line pressure, prevents slurry from returning to the pump cavity. The minimum positive suction head required is 2 PSI above that at the level of the pump diaphragm centerline. If suction lift is required, use Spring-assist or Air Cylinder-assist model.

Discharge Stroke
Compressed air is admitted to the chamber above the diaphragm. The diaphragm descends gradually increasing the pressure in the pump cavity. This, in turn, closes inlet valve A and causes discharge valve B to open when the line pressure is exceeded. Further movement of the diaphragm displaces the slurry from the pump cavity. The pumping action is positive yet gentle so that delicate crystals and slurries can be transferred or metered without damage. Electrical impulses from an adjustable timer alternately open and close the solenoid-controlled air valves which admit and exhaust air from the diaphragm cavity.

The Spring Assist ODS® Pump

In this model, a version of the basic pump, the diaphragm is mechanically lifted by a spring actuated rod. The spring is cocked during the discharge cycle by the air pressure driving the diaphragm downwards. The discharge cycle is the same as in the basic pump. This self-priming model is recommended for applications where:

  • Suction lift is up to 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.
  • The Air Cylinder Assist ODS® Pump

    In this version of the basic pump, the diaphragm is mechanically lifted by an air cylinder actuated rod. At the top of the lift stroke, the air is directed into the diaphragm chamber driving the slurry out of the pump cavity and simultaneously returning the air piston to the lower position. This model is used for applications requiring:

  • Suction lift up to 20 feet.
  • ODS® Pump components and controls

    Variable Timer
    Controls the operation of the solenoid vale to set the number of pumping cycles per minute and the length of the discharge portion of each cycle. The timer can be automated for paced control in response to a 4-20ma signal. The timer is housed in a protective enclosure with a hinged cover, NEMA Type 4. Multiple pump operation options are available.
    Remote or linear response timers are also available. The variable timer is available in several designs.
    Timers are solid state electronic with a wide variety of timing ranges and options, such as stroke counters and relays for remote operation.
    An automatic pressure control system (patent 5,252,041) to feed a plate and frame filter press os available to control single or multiple pumps.

    Pump Cover
    Cast iron.
    It incorporates the port for the air connection and lifting lugs to facilitate installation. It has a sturdy flange at the rim where it bolts to the casing. The cover also is reinforced with radial ribs and code designed (AMSE pressure vessel code) to withstand 100 PSI operating pressure.

    Molded of tough flexible NordelŽ, neoprene, food grade, or VitonŽ optional to withstand various requirements. Reinforcing nylon fabric is strategically located within the diaphragm to provide maximum life under repeated flexure. The uniformity and precision-construction of the multilayered Dorr-Oliver diaphragm is the key to its long service.

    Pump Casing
    Cast iron - standard.
    Cast iron lined with Nordel or neoprene is optional. 316 S/S is optional. Radially located grooves assure complete slurry discharge from the pump cavity. No solids can remain to abrade the diaphragm.

    Base Tee
    Cast Iron - Standard
    Cast iron lined with Nordel or neoprene is optional. 316 S/S is optional. The base tee connects the check vales and the pump casing. It also serves as an equipment support base for pump assembly.

    Control Valve
    Solenoid operated, three way valve. It admits and releases compressed air to move the diaphragm. This valve is normally closed.

    Check Valves
    Available in three models and different materials of construction to meet process requirements.

    Air Chamber
    Used in applications where there is a high head on the suction and/or discharge side of a pump requiring high air pressure. The air chamber acts as a cushion, eliminating water hammer, noise and pulsations.

    Controls air pressure to desired operating conditions.

    Reduces the noise of out-rushing air so that the pump operates very quietly. Less than 85 DBA at 5' on the "A" scale.


    Hinge Assembly
    The hinge assembly increases the ease of maintenance when replacing or inspecting diaphragms. The assembly is also available as a retrofit kit for existing pumps.

    Discharge Stroke Position Sensor
    A. Spring Assist Pumps: Current design provides a sensor located on the spring column tube which is activated by a magnetic disc in the spring assembly. Existing equipment can be refitted by mounting a proximity switch to the spring column tube. The switch is activated by entering the magnetic field.

    B. Air Cylinder Assist Pumps: For air cylinder pumps the proximity switch bracket is mounted on top of the air cylinder.

    Automatic Flow & Pressure Adjustment (AF & PA)
    This feature automatically adjusts the stroke rate and sir pressure to meet varying operating conditions. The system is available for new as well as retrofit pumps.
    To read the original PDF click here.


    • Single pump controller (std.)
    • Multi-range w/ contacts
    • Synchronization for 2 units in parallel
    • Multi-pump controller

    Diaphragm Failure Moisture Detector
    To alert the operator of sudden diaphragm failure, a Moisture Detector Probe can be installed above the diaphragm. Two sets of contacts are provided.

    Automatic Pressure Control System
    (Patent 5,252,041) Designed specifically for feeding a plate and frame filter press. System continuously increases the feed pressure from minimum to maximum while the flowrate is continuously reduced from maximum to minimum.

    Choose Any Of Three Check Valves

    Type Q: Quick-opening ball-check valve
    This is the valve supplied unless another is specified. It is an all-around performer. A quick opening yoke permits easy clean-out and inspection without breaking piping. Positive seating of the ball is assured by gravity and guiding ribs. Ball seat is replaceable.

    Type B: In-Line Ball-Check Valve
    The valve is highly efficient hydraulically with flow passing vertically straight through. It is used in applications where maintenance is infrequent. Streamlined internal design reduces the potential for material to clog or hang up. Positive seating of the ball is assured by gravity and line pressure.

    Type F: Flap-Check Valve
    This valve is recommended when it is necessary to pass large, pipe-size solids without clogging. Removable cover and flap permit inspection and cleaning without breaking piping. A special elastomer disc is installed on the flap to ensure sealing, reduce noise and increase life of the valve. Flow is straight through.

    How to size and specify the right pump for your particular job.

    To properly size and specify the correct ODS® Pump for a given application, there is certain basic information required:

    • Is positive suction head available?
    • What is the maximum discharge head?
    • What is the peak and normal capacity?
    • What is the maximum suction lift?
    • What is the slurry characteristic? (Specify gravity of liquid and solids and Viscosity).
    • What is the slurry temperature?

    The answers to these questions will dictate how your pump is to built.


    Step 1: Pump Model Selection.
    Consider pumping requirement, slurry viscosity and specific gravity, and suction conditions. note that higher specific gravity slurries require greater suction lift capability than water. See pump selection guide for more details.

    Step 2: Material Selection.
    Material of construction is selected based on slurry characteristics - corrosive, abrasive, temperature. See material selection guide for further details.

    Step 3: Air Requirement
    Determine the air requirement based on pumping capacity and discharge need. See performance data charts.

    Step 4: Control Selection.
    Specify manual or automated control system.

    Maximum working pressure ........ 100 psi
    Maximum hydrostatic pressure ........ 150 psi
    Maximum operating temperature ....... 200°F (94°C)

    Performance Data

    Spring Assist ODS® Pump
    The capacity of the ODS® pump depends upon its size, style and stroke rate. The performance data tabulated is for water with flooded suction and Quick Opening Ball Check Valves.

    1. Water temperature at 60°F
    2. Maximum performance at 100 PSI regulator setting
    3. For lined pump max. performance is 10% less

    Air Cylinder Assist ODS® Pump
    The capacity of the ODS® pump depends upon its size, style and stroke rate. The performance data tabulated is for water with flooded suction and Quick Opening Ball Check Valves.

    1. Water temperature at 60°F
    2. Maximum performance at 100 PSI regulator setting
    3. For lined pump max. performance is 10% less

    Dimensional Data

    This data tabulation is for the three types of check valve arrangements and the three styles of ODS® Pumps so as to assure the proper installation of the complete pump.

    How to install your ODS® Pump

    Locate pump to have as short as possible suction line. Allow ample space for inspection and maintenance.

    Air Header
    Air pressure in pump should be set at 15 psi above the discharge head. Install air strainer/filter close to solenoid to protect air valve from loose pipe scale and other impurities. Install air pressure regulator and filter/strainer in accessible location. Use air chamber(s) to dampen surges due to high inlet or outlet pressures to prevent water hammer.

    Muffler on air exhaust will keep operation quiet.

    Use anchor bolts into concrete column. Size stand to provide full support for base tee and to absorb vibration.

    Solenoid Valve
    Solenoid valves must be mounted upright. When handling toxic or corrosive material, locate solenoid valve at a higher elevation than the inlet pressure head.

    All flanges are 125#ASA FF.

    Pump should be horizontal and firmly mounted. Piping should be properly aligned and separately supported to prevent strain being transmitted into check valves and pump.

    Size suction piping equal to, or larger than, inlet slurry valve. Avoid loops in piping and sudden changes in diameter. With two or more pumps discharging into same header, arrange piping so that entry is by means of a Y.

    Pulse Transfer Thickening.
    Another significant advantage of the ODS® Pump.

    Dorr-Oliver's remarkable ODS® pump does things to improve sludge handling that no other pump can do. We call it "Constant peak velocity pulse transfer thickening".
    It is a concept in pumping that ends dilution of most sludges. In other words, no matter how much the pumping rate is reduced, ODS® pumps continue to deliver constant peak scouring velocity. They work on most sludges including municipal sewage, primary clarifier underflow, aerated biological waste, digested sludges and the like.
    ODS® Pumps provide constant pumping velocity at all pumping rates. Pumping rates are matched to sludge accumulation rates. The result is an uninterrupted chain of operating benefits, improving all unit operations.

    To read more information regarding Pulse Transfer Thickening please refer to the information page located here.

    Represented in Canada by:
    ICR Water Technologies Inc.
    3-200 Memorial Avenue, Suite 101
    Orillia, Ontario
    L3V 5X6
    Phone or Fax to: (888) 281-7774

    For more information on this product and to view the in-depth statistics please click here to read the full PDF brochure.