Yamada Pump NDP-500BSC-NPT

The Yamada NDP-500BSC-NPT is a dependable 2-inch air operated diaphragm pump designed for continuous, general-purpose fluid transfer in industrial process lines. Equipped with standard female NPT threaded connections for direct, leak-free piping integration, this heavy-duty pump pairs a 316 stainless steel housing with flexible Neoprene (C) diaphragms to offer high mechanical durability, excellent flex fatigue resistance, and reliable performance across neutral and mild fluid applications.

Driven by Yamada’s patented, oil-free C-Spool air-valve mechanism, this high-efficiency Yamada AODD unit delivers non-lubricated, stall-free operation. Capable of delivering flow rates up to 226 GPM while handling suspended solids up to 5/16”, this AODD pump provides a seal-less, explosion-proof liquid handling solution for industrial wastewater treatment, utility fluid circulation, mild slurry transfer, and general plant maintenance.

2" Fluid Port (NPT or ANSI Flange)

NDP-500 Series:excess of 200 Gallons/Minute

NDP-50 Series:164 Gallons/Minute

G50 Series:193 Gallons/Minute

Intake & Discharge Connections

Polypropylene (PPG): 2" ANSI Flange B16.5 #150
Kynar®(PVDF): 2" ANSI Flange B16.5 #150
Aluminum (ADC-12): 2" ANSI Flange B16.5 #150 (with tapped 2" Female NPT)
Stainless Steel (316): 2" ANSI Flange B16.5 #150 or 2" Female NPT
Cast Iron: 2" Female NPT

Air Inlet: 3/4" Female NPT (includes ball valve)
Air Exhaust: 1" Female NPT (includes silencer)

*NDP-500 only available in Stainless Steel.

Diaphragm Maximum Liquid Temperature

N: Buna N 180°F (82°C)
C: Neoprene 180°F (82°C)
S: Santoprene®(TPO) 180°F (82°C)
E: EPDM 212°F (100°C)
T: PTFE 212°F (100°C)
H: Hytrel®(TPE) 248°F (120°C0)
V: Viton®fluoroelastomer 248°F (120°C)
U/W: Ultiimate 212°F (100°C)
F: Full Flow PTFE 212°F (100°C) (only available for NDP-500)

*The maximum liquuid temperature for metal and Kynar®fitted pumps is determined by the elastomer (diaphragm material). Polypropylene pumps have a maximum liquid temperature of 180°F (82°C) regardless of diaphragm material. 

Air Supply Pressure :

(NDP-50): 20 to 100 PSI Air Supply Pressure
(G50, NDP-500): 20 to 125 PSI Discharge Volume Per Cycle

Rubber diaphragm: 1.12 gallons (NDP-50)
PTFE diaphragm: 0.69 gallons (NDP-50)
Rubber & PTFE diaphragms: 0.63 gallons (G50)

Maximum Cycles Per Minute :

Rubber diaphragm: 146 (NDP-50), 279 (G50)
PTFE diaphragm: 220 (NDP-50), 267 (G50)

Maximum Size Solid: 5/16" (8 mm)

Maximum Dry Suction Lift:

Rubber-fitted pump capability: 19-feetAir Motor

Optional Coating:

PTFE-coated (NDP-50, NDP-500)

Yamada Air-Operated Double Diaphragm Pumps

Engineered for High Performance. Manufactured to Last.

• Leak-Free Bolted Construction: Built for heavy-duty reliability, Yamada’s bolted design ensures precise alignment and effortless reassembly—eliminating the leaks and tedious rebuilds common with clamp-band retainers.
• Externally Accessible Air Valve: Perform quick inspections or routine maintenance directly in-line, without taking the pump out of service.
• Unified Valve Architecture: Standardized air valve assemblies across pump models reduce part confusion and lower inventory overhead.
• Maintenance-Free Pilot Valve: Yamada’s unique modular pilot valve uses an inner center-disk mechanism to trigger valve shifting with zero hassle. Free of dynamic O-rings or awkward snap rings, it requires no routine repairs.

Order by 2PM to get delivered next working day! (Available with NDA shipping Charges on In-stock items) We use 24 hours service with carriers in most cases so that you can get your order delivered on time.

Call (225)-454-0860 to confirm shipping cost and delivery time.