API 674 Duplex Double Acting Piston Pumps - DFX Series

Dynapro Pumps DFX Series are duplex piston double acting pumps designed in compliance with API 674 Standard, Latest Edition.

Design Features and Benefits

Power End Frames

  • Gray cast iron one piece construction for added strength and durability
  • Double extended Jackshaft design allows for left-hand or right-hand drive and easy conversion
  • Double-row-spherical roller bearings carry eccentric.


  • Nodular iron material
  • Designed for use with single tapper bearings and with cylindrical roller bearing for eccentric gear.

Eccentric Gear

  • Double helical gear fitted on eccentric and jackshaft
  • Nodular iron material.


  • Gray cast iron material of construction
  • Polished stainless steel crosshead stubs for long seal life
  • Double sealed crosshead stub seals to prevent oil loss and oil contamination
  • Replaceable bronze crosshead slides.

Connecting Rods

  • Nodular iron material
  • Dual roller bearing design.


  • Full splash with oil pump to feed lubrication to all moving parts, keeping the oil constantly circulated and cooled
  • Oil sight gauge allows quick convenient observation of power end oil level when running or idle.

Liquid End Cylinders

  • Nodular iron material
  • Wing type valves with nodular iron material, seats of steel
  • Liner material is of hardened steel
  • Piston rod is of hardened steel, ground grinding finished
  • Piston is from rubber with strong fiber back.

Performance Envelope-

Design Standard – API 674, Latest Edition.
Design Pressure Rating – Up to 1900 psig.
Temperature Rating – Up to 90 °C.
Flowrate – Up to 410 USgpm.
Differential Head – Up to 2000 m (6562 ft).
Speed – Up to 3600 rpm.