Diaphragm Pumps Ltd

NDP15 Air Operated Double Diaphragm (AODD) Pumps are becoming the most common pumps for use when Only Air is available or when pumping solid laden liquids or slurries. NDP15 Diaphragm Pumps have no seals as the diaphragm acts as the barrier between the Liquid side and the drive side of the pump. When the liquid pressure reaches the air pressure, the NDP15 pump reaches a point of balance and stalls without the need for bypasses or overload protection.NDP15 Diaphragm Pumps pump can run dry indefinately and have the ability to self prime to 7 metres or more in some cases. They can handle viscosities up to 20000 Centipoise as standard and some NDP15 models can handle cPs into the 100's of 1000's. NDP15 Pumps are some of the most reliable AOD's in the marketplace, Self Priming, Dry running, Intrinsically safe, these are just a few of the features of NDP15 Diaphragm Pumps. Models include pumps for pumping hygienic products, aggressive chemicals aswell as standard industrial duties. High pressure models are also available for filter press applications or for pumping into closed systems. ATEX regulated NDP15 pumps are offered for Zone 1 environments. NDP15 Pumps and spares are available from Diaphragm Pumps Ltd, Stoke On Trent, England. As one of the largest stockists of pumps and spares in Europe, we hope we can supply all your NDP15 Pump needs.

Yamada NDP-15 Series Pumps

15 GPM Maximum Capacity - 1/2" Port Size

    Port Dimensions
    Intake & discharge connection
  • Polypropylene (PPG)* 1/2" Female NPT
  • Kynar (PVDF)** 1/2" Female NPT
  • Aluminum (ADC-12)*** 1/2" Female NPT
  • Stainless Steel (316)*** 1/2" Female NPT

    • *Polypropylene pumps may be fitted with ball or flat check valves. Ball-type check valves are recommended for flooded suction applications. Flat-type check valves are recommended for suction lift applications.

    **Kynar pumps are fitted with flat check valves only.

    ***Aluminum and Stainless Steel pumps are fitted with ball check valves only.

    Air inlet
  • 1/4" Female NPT (includes ball valve)
    • Air exhaust
  • 3/8" Female NPT (internal silencer)
    • Maximum Liquid Temperature****
    Diaphragm Material / Temperature
  • Neoprene: 180°F (82°C)
  • Buna N: 180°F (82°C)
  • Hytrel: 248°F (120°C)
  • Santoprene: 225°F (107°C)
  • Viton: 248°F (120°C)
  • Teflon: (PTFE) 212°F (100°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 kfg/cm)
    • Discharge Volume Per Cycle
    Flat-type check valve
  • 0.0375 gallons (138 cc)
    • Ball-type check valve

  • 0.031 gallons (119 cc)
    • Maximum Cycles Per Minute
  • All diaphragms: 400
    • Maximum Size Solid
  • 1/32" (1 mm)
    • Maximum Dry Suction Lift
  • Flat-type check valve: 8-feet
  • Ball-type check valve: 5-feet
    • Pump Air Motor
  • Ryton air motor standard

Notes: Hytrel-fitted pumps include Buna N check balls & wetted o-rings. Santoprene-fitted pumps include EPDM check balls & wetted o-rings.

Click Here for the NDP5 & NDP15 Maintenance Manual