UL Listed Diaphragm Pump

Yamada® U.L. Listed Diaphragm Pump

Yamada® manufactures U.L. listed pumps that meet safety requirements set by Underwriters Laboratory Code 79 for use in the petrochemical, chemical, and petroleum industries. These pumps are designed to transfer volatile fluids using durable Hytrel® and PTFE elastomers with Aluminum wetted components that have been approved by U.L. The pumps come in two sizes, 3/4" (NDP-20) and 1" (NDP-25) port sizes, with flow ranges from 1-46 gallons per minute. The U.L. Code 79 sets the limit for pump discharge pressure at 50 PSI and requires pumping temperatures to remain within the range of –20°F to 125°F.

Key Features

  • Designed to meet safety requirements established by Underwriters Laboratory Code 79
  • Suitable for petrochemical, chemical, and petroleum industries
  • Approved by U.L. to transfer volatile fluids
  • Aluminum wetted components with durable Hytrel® and PTFE elastomers
  • Available in 3/4" (NDP-20) and 1" (NDP-25) port sizes
  • Flow ranges from 1-46 gallons per minute
  • Maximum transfer capacity of up to 38 GPM
  • Pump discharge pressure limited to 50 PSI by U.L. Code 79
  • Pumping temperatures must remain within the range of –20°F to 125°F
  • Patented, self-lubricated air valve never needs internal or external lubrication
  • Non-stalling air valve with 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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