Quintuplex Plunger Pumps API 674 - QD & QDP Series

Quintuplex Plunger Pumps Dynapro Pumps QD & QDP (Piston) Series are reciprocating quintuplex plunger and piston pumps designed in compliance with API 674, Latest Edition.

Design Features and Benefits

Power End Frames

  • Gray cast iron one piece construction for added strength and durability
  • Symmetrical design allows for left-hand or right-hand drive and easy conversation
  • Versatile design accepts V-belt, chain, gear, or clutch drive trains.


  • High strength forging steel construction is standard; forged alloy steel is available for special applications
  • Designed for use with tapered roller bearings to carry higher crankshaft/rod loads.


  • Circular full piston type crossheads evenly distribute rod load to power frame
  • Polished stainless steel crosshead stubs for long seal life
  • Double sealed crosshead stub seals to prevent oil loss and oil contamination
  • Crosshead extensions connect to plungers outside of power frame for easier


Connecting Rods

  • High strength cast steel construction
  • Precision automotive type Babbitt lined journal bearings.


  • Splash and gravity lubrication promotes 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.

Fluid Cylinder

  • High chrome steel material is standard; stainless steel, aluminum bronze, and duplex stainless steel are available as required
  • Threaded NPT connections or flanged for higher flow rate are standard; other special connections available upon request
  • Spring loaded valves for positive closing
  • Large volumetric areas through seats for reduced fluid velocity and efficient fluid transfer
  • ColmonoyTM coated steel plungers are standard; other coatings and materials are available as required.

Performance Envelope-
Design Standard – API 674, Latest Edition.
Design Pressure Rating – Up to 11000 psig.
Temperature Rating – Up to 90 °C.
Flowrate – Up to 1650 USgpm.