Yamada NDP-5 air-operated diaphragm pump, 1/4", up to 12.9 L/min

The Yamada NDP-5 series air-operated double diaphragm pump is designed for small volumes of chemicals, solvents, inks and reagents. It is driven by compressed air with no electric motor and no mechanical seal; the pump is self-priming and can run dry.

Flow up to 3.4 gpm (12.9 L/min), displacement about 29 ml per cycle, up to 400 cycles/min. Liquid port 1/4" NPT, air pressure 1.4–7 bar, dry suction lift up to 1.5 m. Liquid temperature up to 82 °C for polypropylene and acetal and up to 100 °C for PVDF, aluminium and 316 stainless steel with PTFE diaphragm. The air valve is lube-free and serviceable from the outside.

Model code example: NDP-25BPT — NDP-25 series, B — ball valve, P — polypropylene, T — PTFE diaphragm; suffixes: -FLG flange, -HP 2:1 pressure, -D drum version, -Z split manifold, -FDA food grade version.

Key features:

• Compact AODD pump with 1/4" NPT port
• Flow up to 12.9 L/min, up to 400 cycles/min
• Self-priming and dry running, no electric motor
• PP, acetal, PVDF, aluminium or AISI 316 body
• Lube-free air valve, serviceable from the outside

Specifications:

• Type: AODD, 1:1 ratio
• Flow: up to 3.4 gpm (12.9 L/min)
• Displacement per cycle: ~29 ml
• Speed: up to 400 cycles/min
• Liquid port: 1/4" NPT
• Air inlet: 1/4" NPT, with valve
• Air pressure: 1.4–7 bar (20–100 psi)
• Dry suction lift: 1.5 m
• Body material: PP, acetal, PVDF, aluminium, AISI 316
• Diaphragm: PTFE (in base NDP-5F*T)
• Liquid temperature: up to 82 °C (PP, acetal); up to 100 °C (PVDF, Al, AISI 316 with PTFE)
• Weight: 1.3–2.7 kg

Application: Transfer and dosing of small volumes of chemicals, solvents, inks and reagents.

Scope of supply: Pump, muffler, air valve. Filter regulator and pulsation dampener are supplied separately.

Before ordering: Before ordering, specify the pumped liquid and its temperature, required flow and pressure, and the body and diaphragm materials — this combination in the model code determines chemical resistance, permissible temperature and pump weight.