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NDP-15 Pump

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The design of the NDP-15 air operated double diaphragm pump provides high suction lift, even at dry startup and with heavier fluids (incorporating internal check valves). No close fitting or sliding parts are at risk – the pump can run dry without damage. Pumps will run at any setting within their operating range simply by adjusting the air inlet pressure and system conditions. One pump can fit a broad spectrum of applications. Pumps transport easily to the application site. No complex controls to install or operate, simply connect an air supply, attach fluid connections, and the pump is ready to perform.


13.5 GPM Max.
Port Dimensions
Intake & discharge connection:
Polypropylene (PPG) ■ 1/2″ Female NPT
Kynar® (PVDF)◆ 1/2″ Female NPT
Groundable Acetal ◆ 1/2″ Female NPT
Aluminum (ADC-12) ▲ 1/2″ Female NPT
Stainless Steel (316) ▲ 1/2″ Female NPT
Air inlet (includes ball valve): 1/4″ Female NPT
Air exhaust (internal silencer): 3/8″ 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® and Groundable Acetal pumps are fitted with flat
check valves only.
▲ Aluminum and Stainless Steel pumps are fitted with ball
check valves only.
Maximum Liquid Temperature Diaphragm Material Temperature
Buna N 180°F (82°C)
Neoprene 180°F (82°C)
Santoprene® (TPO) 180°F (82°C)
PTFE 212°F (100°C)
Hytrel® (TPEE) 248°F (120°C)
Viton® fluoroelastomer 248°F (120°C)fitted pumps is determined by the elastomer (diaphragm
material). Polypropylene and Groundable Acetal pumps
have a maximum liquid temperature of 180°F (82°C)
regardless of diaphragm material.
Air Supply Pressure (All Models) 20–100 PSI (1.4–7 kfg/cm)
Discharge Volume Per Cycle 0.0338 gallons (128 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
Air Motor Ryton® air motor standard




  • Outside Accessible Air Valve – inspection or maintenance can be performed without removing the pump from service
  • Unified Air Valve Concept – common-size air valve assemblies reduce parts confusion & inventory
  • Non-Lubricated Air Valve – reducing pumpage contamination and maintenance issues
  • Pilot Valve – maintenance free modular pilot valve
  • Rugged, Bolted Construction – eliminates leaks & simplifies post-maintenance reassembly.
  • Diaphragm Dynamics – optimal stroke length maximizes diaphragm life & performance.
  • Durable Foot & Base Support – designed to absorb weight distribution

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