Yamada Pump NDP-500BSV-NPT

The Yamada NDP-500BSV-NPT is a high-performance 2-inch air operated diaphragm pump designed for heavy-duty fluid transfer involving oils, fuels, and aggressive hydrocarbons. Featuring standard female NPT threaded connections for direct, leak-free pipe integration, this pump combines a 316 stainless steel casing with specialized FKM (Viton) diaphragms to deliver maximum thermal stability and chemical resistance across demanding process lines.

Driven by Yamada’s patented, oil-free C-Spool air-valve mechanism, this reliable Yamada AODD unit ensures stall-free operation without requiring air line lubrication. Capable of delivering high-volume flow rates up to 226 GPM while passing suspended solids up to 5/16”, this AODD pump offers a seal-less, explosion-proof liquid handling solution for petrochemical processing, fuel transfer, oil refining, and industrial wastewater treatment.

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.