UL Listed Diaphragm Pump

Yamada® U.L. Listed Diaphragm Pump

U.L. listed pumps are manufactured for the petrochemical, chemical, and petroleum industries to meet safety requirements established by Underwriters Laboratory Code 79.

Pumps include Aluminum wetted components with durable Hytrel® and PTFE elastomers, approved by U.L. to transfer volatile fluids.

Pumps are available in 3/4" (NDP-20) and 1" (NDP-25) port sizes, with flow ranges from 1-46 gallons per minute. U.L. Code 79 limits pump discharge pressures to no more than 50 PSI and pumping temperatures must adhere to the range of –20°F to 125°F.

Key Features

  • Maximum transfer capacities as high as 38 GPM
  • Patented, self-lubricated air valve never needs internal or external lubrication
  • Non-stalling air valve which includes a non-centering, spring assisted shuttle ensures a positive shift every time
  • Outside accessible air valve allows for inspection and maintenance without removing the pump from service
  • Short stroke design reduces flex and extends diaphragm life

Related Products



Fluid Port Size 3/4" Female NPT and 1" Female NPT
Diaphragm Material Hytrel® and PTFE
Discharge Volume Per Cycle 0.14 gal. (530cc) and 0.23 gal. (862cc)
Max. Cycles Per Minute 135 and 168
Air Inlet 1/4" Female NPT and 3/8" Female NPT
Air Exhaust 3/4" Female NPT
Maximum Solid Size <1/16" (1.6mm) and <3/16" (4.8mm)
Air Supply Pressure 50 PSI
Net Weight 19.8 lbs.(9 kg) and 28.7 lbs.(13 kg)


Model # Description
852098-UL NDP-20BAH-UL
851518-UL NDP-20BAT-UL
852100-UL NDP-25BAH-UL
851531-UL NDP-25BAT-UL


:: Aluminum (NDP-20)
Dimensions: 9.80" W x 12.5" H
Net Weight: 19.8 lbs. (9.0 kg)
Shipping Weight: 23.8 lbs.
:: Aluminum (NDP-25)
Dimensions: 11.30" W x 14.93" H
Net Weight: 28.7 lbs. (13 kg)
Shipping Weight: 33.7 lbs.




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