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Air-Operated Double-Diaphragm (AODD) Pumps — NDP Series & More

• Yamada’s NDP Series forms the backbone of their industrial AODD range. It includes numerous models — from compact small-port units up to large 3" fluid-port versions — covering flow rates from a few litres per minute up to ~214 gallons per minute (≈ 800–900 L/min), depending on model and configuration.
• Construction options are broad: aluminium, stainless steel (316), cast iron, polypropylene (PP), Kynar® (PVDF) among others — and a wide selection of diaphragm/valve materials to match chemical compatibility, abrasion resistance, or specific fluid requirements.
• The design features a patented, non-lubricated air-valve system (“C-Spool” / unified air-valve concept), which provides stall-free operation, simplified maintenance, and reliability over long service life.
• Additional specialties: Yamada offers versions for high-pressure, solids-handling slurries, chemical/media compatibility, and “speciality” variants (e.g. FDA / sanitary-compatible / chemical-resistant builds) for more demanding or regulated applications.

Yamada pumps are used across a very wide range of sectors because of their versatility and robust design. Typical application areas include:

• Chemical, petrochemical & processing industries – for chemical transfer, solvents, corrosives, resins, viscous fluids or abrasive media.
• Wastewater, sludge, effluent & slurry handling – capable of handling solids-laden, abrasive, or contaminated liquids, often used in waste-water treatment, industrial effluent, or process waste.
• Manufacturing, coatings, paints, inks, adhesives & bulk liquids – for transfer, recirculation, loading/unloading, and general fluid handling in manufacturing plants.
• Food, beverage, pharmaceutical & sanitary-sensitive processing – with appropriate wetted-materials/options, Yamada’s AODD pumps serve environments where chemical compatibility and cleanability are important.
• Oil, lubrication, fuel, solvent & general industrial fluid transfer – including oils, lubricants, solvents, fuels, slurries, and general transfer tasks where solids, viscosity or chemical aggressiveness vary.

• Decades of experience & global reputation — Yamada has been innovating in diaphragm pumps since 1905, and continues to lead in AODD technology worldwide.
• Comprehensive, well-engineered product line — from small, compact diaphragm pumps to large industrial AODD units; many materials and configurations for fluids ranging from chemicals, slurries to sanitary media.
• Reliable, low-maintenance design — patented non-lubricated air-valve technology, bolted construction, interchangeable parts, and simple maintenance reduce downtime and total cost of ownership.
• Strong versatility and fluid compatibility — suitable for diverse fluids, from aggressive chemicals and slurry to oils, solvents, viscous media or sanitary fluids; solids handling, dry-run capability, self-priming, and suction lift add flexibility.
• Wide industry applicability — from manufacturing, chemical, wastewater, oil & gas, to food, pharma and general industrial applications — a pump solution for almost every fluid-handling challenge.