Yamada® NDP-25 Series Double Diaphragm Pumps

Yamada® NDP-25 series Air Powered Double Diaphragm (AODD) pumps provide a maximum flow rate of 49 gallons per minute. Pumps are available in aluminum, stainless steel (316), cast iron, polypropylene, and Kynar construction, with a wide variety of diaphragm materials.

46.2 Gallons/Minute Max.
1" Fluid Port (NPT or ANSI Flange)

Intake & Discharge Connections

Polypropylene (PPG): 1" Female NPT or 1" ANSI Flange B16.5 #150

Kynar® (PVDF): 1" Female NPT or 1" ANSI Flange B16.5 #150

Aluminum (ADC-12): 1" Female NPT

Stainless Steel (316): 1" Female NPT

Cast Iron: 1" Female NPT

Air Inlet

3/8" Female NPT (includes ball valve)

Air Exhaust

3/4" Female NPT (includes silencer)

Maximum Liquid Temperature*

Diaphragm Material / Temperature

• Buna N: 180°F (82°C)
• Neoprene: 180°F (82°C)
• Santoprene® (TPO) 180°F (82°C)
• EPDM: 212°F (100°C)
• PTFE 212°F (100°C)
• Hytrel® (TPE) 248°F (120°C)
• Viton® fluoroelastomer 248°F (120°C)

*Polypropylene pumps have a maximum liquid temperature of 180°F (82°C) regardless of diaphragm material. Kynar® pumps have a maximum temperature of 248°F (120°C) when fitted with Hytrel® or Viton® diaphragms.

Air Supply Pressure (All Models)

20 to 100 PSI (1.4 to 7 kgf/cm²)

Discharge Volume Per Cycle

Rubber diaphragm: 0.23 gallons (862 cc)

PTFE diaphragm: 0.17 gallons (654 cc)

Maximum Cycles Per Minute

Rubber diaphragm: 210

PTFE diaphragm: 210

Maximum Size Solid

3/16" (4.8 mm)

Maximum Dry Suction Lift

Rubber-fitted pump capability: 18-feet

Air Motor

Standard: Aluminum

Optional Coating

PTFE-coated

All Polypropylene, Aluminum, Cast Iron, and SS Hytrel® fitted pumps include Hytrel® check balls and Buna N wetted orings. Santoprene® fitted pumps include Santoprene® check balls and EPDM wetted orings. Kynar® (PVDF) pumps fitted with Santoprene®, Hytrel®, or PTFE include PTFE check balls and orings. Kynar®/EPDM fitted pumps include EPDM check balls and orings. Viton® fitted pumps include Viton® check balls and orings.