NDP-25 Specifications
Port Dimensions (46.2 GPM Max.)
Intake & discharge connection:
Polypropylene (PPG) 1" Female NPT
Kynar® (PVDF) 1" Female NPT
Aluminum (ADC-12) 1" Female NPT
Stainless Steel (316) 1" Female NPT
Cast Iron 1" Female NPT
Air inlet (incl. ball valve): 3/8" Female NPT
Air exhaust (incl. silencer): 3/4" Female NPT
ANSI Flange also available — consult Yamada.
Maximum Liquid Temperature*
Diaphragm Material Temperature
Buna N 180°F (82°C)
Neoprene 180°F (82°C)
Santoprene® (TPO) 180°F (82°C)
EPDM 212°F (100°C)
PTFE 212°F (100°C)
Hytrel® (TPEE) 248°F (120°C)
Viton® fluoroelastomer 248°F (120°C)
*The maximum liquid temperature for metal and Kynar®-fit- Aluminum Polypropylene
ted pumps is determined by the elastomer (diaphragm Dimensions: 11.30" W × 15.08" H ANSI Flange Dimensions:
material). Polypropylene pumps have a maximum liquid Net Wt.: 27 lbs. (13.0 kg) 14.40" W × 17.40 " H
temperature of 180°F (82°C) regardless of diaphragm mate- Shipping Wt.: 31 lbs. NPT Dimensions:
rial. Kynar® (PVDF) 14.40" W × 16.90" H
ANSI Flange Dimensions: Net Wt.: 29 lbs. (10.9 kg)
Air Supply Pressure (All Models) Shipping Wt.: 30 lbs.
20 – 100 PSI (1.4 – 7 kfg / cm) 14.40" W × 17.40 " H
NPT Dimensions: Cast Iron or S.S.
Discharge Volume Per Cycle 14.40" W × 16.90" H Dimensions: 11.30" W × 15.08" H
Rubber diaphragm: 0.22 gallons (833 cc) Net Wt.: 29.7 lbs. (13.4 kg) Net Wt.: 43 lbs. (19.9 kg)
PTFE diaphragm: 0.21 gallons (787 cc) Shipping Wt.: 33 lbs. Ship Wt.: 46 lbs.
Maximum Cycles Per Minute Model Number Nomenclature
Rubber diaphragm: 210
PTFE diaphragm: 210 Series: NDP-25 B x x
Maximum Size Solid NDP-25
3/16" (4.8 mm) Pump
Maximum Dry Suction Lift
Valve Type:
Rubber-fitted pump capability: 18-feet
B = Ball
Air Motors: Aluminum air motors are standard on Diaphragm Material:
metal pumps; glass-filled polypropylene air motors C = Neoprene (CR)
are standard on plastic and Kynar® pumps. Body Material: N = Buna N (NBR)
P = Polypropylene E = Nordel™ (EPDM)
Optional: Split manifold—contact Yamada A = Aluminum S = Santoprene® (TPO)
Notes: Santoprene® fitted pumps include EPDM wetted o-rings. S = Stainless Steel T = PTFE
Kynar® (PVDF) pumps fitted with Santoprene®, Hytrel®, or PTFE F = Cast Iron V = Viton® (FPM)
include PTFE check balls & o-rings. Kynar®/EPDM fitted pumps V = Kynar® H = Hytrel® (TPE)
include EPDM check balls & o-rings. Viton® fitted pumps include
Viton® balls & o-rings.
NDP-25 Performance Curve – PTFE
PTFE Diaphragm Performance Curve
To calculate performance for Santoprene® and Hytrel®-fitted pumps, use Rubber Diaphragm Curve.
AutoCAD® is a registered trademark of Autodesk, Inc.
Hytrel® is a registered trademark of E.I. du Pont de Nemours and Company.
Kynar® is a registered trademark of Arkema.
Nordel™ is a trademark of DuPont Dow Elastomers.
Ryton® is a registered trademark of Chevron Phillips Chemical Company.
Santoprene® is a registered trademark of Advanced Elastomer Systems.
Swagelok® & VCR® are trademarks of the Swagelok Companies.
Viton® is a registered trademark of DuPont Performance Elastomers.
Due to Yamada’s continued commitment to product improvement, specifications may change
without notice.
