Managing plant operations and guaranteeing on-time output requires a high degree of predictability that’s hard to ensure – especially in chemical processing environments. Designed to achieve long-term repeatable performance, Flowserve’s reverse vane impeller makes Mark 3 ANSI pump operations as close to future-proof as you’ll get.

Reverse Vane Impeller Advanced Design

Installed standard on all Durco Mark 3 ANSI pumps, the reverse vane impeller is engineered to deliver repeatable pump performance throughout the life of the pump through:

  • Low, predictable seal chamber pressure and thrust loads achieved by reverse vane pumping action and balance holes

  • Lowest required NPSH of any ANSI standard pump
  • Abrasive wear shifted to the rear cover rather than the more expensive casing

  • The only impeller design that takes full advantage of the back pull-out feature. The critical running clearance is set between the rear of the impeller and the rear cover plate.
  • This allows for the impeller clearance setting and mechanical seal installation to be made in the shop instead of under adverse field conditions

  • External micrometer impeller adjustment accurately sets impeller clearance in 20 seconds – in the shop or in the field.

These features facilitate routine maintenance and work to extend bearing and seal life, thus increasing uptime and reducing the total cost of pump ownership.

Reverse Vane versus Open Style Impellers

Reverse Vane:  Unlike open impellers, the Durco reverse vane impeller offers predictable, repeatable, like-new performance each time it is adjusted. Here's how:

A reverse vane impeller has only one set of pumping vanes and one critical tolerance. This single tolerance — between the impeller and the rear cover — establishes:

  • Performance
  • Efficiency
  • Seal chamber pressure
  • Thrust loads

Wear between the reverse vane impeller and the rear cover causes axial thrust loads to decrease as the seal chamber gap widens. At the same time, seal chamber pressure increases. By adjusting the setting of the reverse vane impeller against its single tolerance location, the original seal chamber pressure and axial thrust loads are re-established. The result is consistent, like-new performance.

Open Style:  A front vane open style impeller has two sets of pumping vanes and two critical tolerance locations:

  • The front vane clearance to the casing –  establishes performance and efficiency
  • The pump out vanes clearance to the rear cover – establishes seal chamber pressures and seal life, as well as thrust loads and bearing life

Wear causes axial thrust loads and seal chamber pressure to increase as the seal chamber gap widens. But the impeller cannot be adjusted to both tolerance locations at the same time. Seal chamber pressure and bearing loads increase after each adjustment. Performance is diminished and seal and bearing life suffers as a result.

Compare the effects of wear and impeller readjustment:

compare adjustment requirements and performance of reverse vane versus front open vane impellers
The Mark 3 ships with the exclusive reverse vane impeller, and offers alternative models to suit your application

Mark 3 Impeller Alternatives

We also offer alternative impeller styles to best suit various solids and flow types:

Front Vane Open Style – interchangeable with the reverse vane impellers, this option is ideal for fibrous, stringy materials and certain applications requiring high shear against the casing.

Radial Vane – for low-flow-high-head applications.

Low-flow and recessed impeller configurations are also available – see our Mark 3 extended line page.

Watch how the reverse vane impeller works together with the Durco Mark 3's other exclusive design features to maximize uptime, streamline maintenance and deliver the highest performance for your lowest total cost of ownership.

Mark 3 ANSI pump literature

Specification Tools

Solve for tomorrow's challenges today.

If your goal is to improve reliability, Mark 3 ANSI pumps are an excellent start. From upgrading a single pump to standardizing your entire install base, the PP&S team can help you determine your most reliable and cost effective solution – now and for the long run.  We also offer proactive Reliability and TLC Solutions to reduce your total cost of ownership – from one pump, to multiple systems and plant locations.

Give us a call – we'll make maximizing performance while attaining your lowest total cost of ownership not only achievable, but easier.

Click to visit these spotlights on the Durco Mark 3's advanced design features + options:

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PP&S provides Rotating/Process Equipment and Total Lowest Cost solutions in Alabama, Georgia, North Carolina, South Carolina, Virginia and the Florida panhandle. If you are seeking equipment or support outside these areas or in the EU, please refer to the OEMs' website for distributors in your area.