Yamada® NDP-20 Series Double Diaphragm Pumps

Yamada® NDP-20 series Air Powered Double Diaphragm (AODD) pumps provide a maximum flow rate of 28 gallons per minute. Pumps are available in aluminum, stainless steel (316), and polypropylene construction, with a wide variety of diaphragm materials.

31.7 Gallons/Minute Max.
3/4" Fluid Port (NPT or ANSI Flange)

Intake & Discharge Connections

Polypropylene (PPG): 3/4" Female NPT or 3/4" ANSI Flange B16.5 #150

Aluminum (ADC-12): 3/4" Female NPT

Stainless Steel (316): 3/4" 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.

Air Supply Pressure (All Models)

20 to 100 PSI (1.4 to 7 kgf/cm²)

Discharge Volume Per Cycle

Rubber diaphragm: 0.163 gallons (615 cc)

PTFE diaphragm: 0.143 gallons (539 cc)

Maximum Cycles Per Minute

Rubber diaphragm: 195

PTFE diaphragm: 195

Maximum Size Solid

1/16" (2.0 mm)

Maximum Dry Suction Lift

Rubber-fitted pump capability: 18-feet

Air Motor

Standard: Aluminum

Hytrel® fitted pumps include Hytrel® check balls and Buna N wetted o‑rings. Santoprene® fitted pumps include Santoprene® check balls and EPDM wetted o‑rings.