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Mark 3 Standard Pumps

100% dimensionally interchangeable with Durco (Flowserve) Mark III -- Group I, II, and III frames. Reverse vane impeller design reduces axial thrust and seal chamber pressure.
External impeller adjustment mechanism -- the industry most innovative design. Allows fast, accurate impeller clearance setting without pump disassembly.
Full wet-end alloy coverage: Hastelloy C-276, Titanium Pd7B, CD4MCuN duplex, CN7M Alloy 20, Nickel, Zirconium. 20-40% cost savings vs OEM with identical performance.
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Product Details

Application Chemical processing, petrochemical refining, corrosive chemical transfer, pulp & paper mill liquors, reverse vane impeller applications, high-temperature services, MRO replacement programs, EPC project procurement
Flow Rate Up to 7,500 GPM (1,703 m3/h)
Head Range Up to 990 ft (302 m)
Temperature -73 degrees C to 370 degrees C (-100 degrees F to 700 degrees F)
Materials CF8M (316SS), CD4MCuN (Duplex), CN7M (Alloy 20), WCB (Carbon Steel), Hastelloy B, Hastelloy C-276, Nickel 200, Titanium Grade Pd7B, Zirconium 702
Pressure Rating Up to 27 bar (400 PSIG)

1.Our pumps could be 100% interchangeble with leading enterprise's Mark III series.


2.The wet ends material like Titanium, Nickel, Hastelloy C, A20, CD4M, 316SS, Cast Steel etc are all available.

Features and benefits

Decrease total cost of possession from reverse vane impeller, which eases upkeep and provides renewable, excessive-performance performance over the pump's life.


Multiplied reliability and mechanical seal existence due to an appropriate seal surroundings created through the sealsentry seal chamber.


Ease of maintenance attributable to ideal, predictable seal chamber pressures that are re-hooked up after every impeller placing.


Prolonged mechanical seal and bearing life thru strong shaft and bearing designs that still reduce shaft deflection.

Speedy and correct impeller placing with the enterprise’s most revolutionary outside impeller adjustment mechanism.


In-save opposite vane impeller adjustment with the most effective pump that takes complete gain of the lower back pull-out layout.


This bulletin contains instructions and guidelines for the installation, operation, and maintenance of the Durco Mark III ANSI Standard Pump, the Mark III Sealmatic Pump, the Mark III Unitized Self-Priming Pump, the Mark III Recessed Impeller Pump and the Mark III Lo-Flo Pump.

The “A” designation signifies that both of these power ends are the new improved design that was released in 1995. Information concerning the older Mark III and ANSI 3 power ends is also available in the IOM.

There are many factors affecting the successful installation,operation, and maintenance of a pump. From one pump to the next there is typically significant variation in these factors. This makes it impossible to create a bulletin that covers all situations.


It is extremely important that this entire bulletin be read prior to installation or start-up of the pump. This is important for safety, for proper performance of the pump, and for maximum Mean Time Between Planned Maintenance (MTBPM).

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