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Yamada NDP-5 Series 1/4″ Air-Operated Double-Diaphragm Pump
The Yamada® NDP-5 Series 1/4″ AODD pump delivers a maximum flow rate of 3.4 GPM (12.8 LPM) with exceptional reliability and precise chemical metering. Powered by Yamada’s patented non-lubricated main air valve and independent pilot mechanism, the NDP-5 series eliminates stall issues and lubricator maintenance. Available in Polypropylene, Kynar® (PVDF), Groundable Acetal, Aluminum, and 316 Stainless Steel wetted constructions.
Overview
Designed for precision metering, OEM integration, and chemical transfer, the Yamada® NDP-5 Series 1/4″ AODD Pump delivers up to 3.4 GPM (12.8 LPM) in a compact, portable package. Featuring Yamada’s patented non-lubricated air valve technology and an independent pilot mechanism, the NDP-5 guarantees stall-free operation and clean performance without requiring air line lubrication.
Key Features & Advantages
- Patented Air Valve Technology: Non-lubricated main air valve and independent pilot mechanism ensure stall-free, reliable air logic control.
- Versatile Metallurgy & Synthetics: Available in Polypropylene (PPG), Kynar® (PVDF), Groundable Acetal, Aluminum (ADC-12), and 316 Stainless Steel.
- Compact & Portable: 1/4″ NPT fluid ports make it ideal for tight spaces, OEM machinery, and mobile skids.
- Dry Suction Lift: Self-priming capability up to 5 feet dry lift.
- Built-in Noise Reduction: Standard Ryton® air motor includes an internal exhaust silencer with a 3/8″ NPT port for external exhaust venting.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand / Manufacturer | Yamada® America, Inc. |
| Series | NDP-5 Series |
| Max Flow Rate | 3.4 GPM (12.87 LPM) |
| Fluid Port Size (Intake/Discharge) | 1/4″ Female NPT |
| Air Inlet Size | 1/4″ Female NPT (Includes Ball Valve) |
| Air Exhaust Port | 3/8″ Female NPT (Includes Internal Silencer) |
| Air Supply Pressure Range | 20 to 100 PSI (1.4 to 7 kgf/cm²) |
| Displacement Per Cycle | 0.0078 gallons (29 cc) |
| Max Cycles Per Minute | 400 CPM |
| Max Dry Suction Lift | 5 feet (1.5 m) |
| Air Motor Material | Ryton® (Standard) |
Maximum Liquid Temperature Limits (PTFE Fitted)
| Wetted Body Material | Max Temperature |
|---|---|
| Groundable Acetal | 180°F (82°C) |
| Polypropylene (PPG) | 180°F (82°C) |
| Kynar® (PVDF) | 212°F (100°C) |
| Aluminum (ADC-12) | 212°F (100°C) |
| 316 Stainless Steel | 212°F (100°C) |
Typical Applications
- OEM equipment and chemical dosing skids
- Inks, dyes, and solvent circulation
- Laboratory and high-purity chemical processing
- General industrial fluid dispensing
