SPD Self-Primer Diaphragm

The SPD self-primer diaphragm pumps are used in a variety of applications where durable, solids handling is a must, even in applications where the pumped fluid is extremely vicious.  The SPD product line features a simplex or duplex diaphragm orientation, a discharge port clean-out, an integral 30:1 gear reduction housing and a flex coupled power frame for coupling to nearly any type of driver.  Diesel, gasoline, air, PTO and electric motors are available from a driver standpoint.  This fluid end is designed to be used in the most aggressive of applications with solids passing capability through 3-¾ inches (95 mm).
SPD Self-Primer Diaphragm

Flow & Pressure Characteristics

Flows To:  240GPM (55 m³/hr)
Heads To:  50 Feet (15 m)
Temperatures To:  120ºF (49ºC)
Solids Passing:  To 3.75 inches (95 mm)
Speed Ranges:  1500 RPM To 1800 RPM

Size Range

3×3 (80/80) – 4×4 (100/100)

Features & Benefits

  • Case iron casing
  • Positive displacement diaphragm with large solids passing capability
  • Pulsation damper port standard
  • Discharge port clean-out standard
  • Can run dry indefinitely
  • 3″ or 4″ NPT suction/3″ or 4″ NPT discharge ports
  • No dynamic seal present in pump (no packing or mechanical seal)
  • 30:1 gear reduction housing (1800 RPM input and 60 RPM output)
  • Power frame with Timken bearings that can be coupled to any driver type (electric motor, gasoline engine, Diesel engine, power take off (PTO), air motor

Available Metallurgies

  • Cast iron, ductile iron, all 316 stainless steel, all Cd4MCu, all Alloy 20, All Hastalloy (B&C), all 2205 super duplex stainless steel, all 2507 super duplex stainless steel, Cr28, all Titanium


  • Chemical Processing
  • Food & Beverage
  • General Industry
  • Irrigation & Agriculture
  • Marine & Offshore
  • Mining & Aggregate
  • Pulp & Paper
  • Water Resources