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Industrial cast iron centrifugal pump motor assembly with NPT fittings

Dayton

Dayton 4RJ73 3/4 HP Cast Iron Centrifugal Pump 208-230/460V

SKU CH-18VD-VV57T MPN 4RJ73

Three-phase cast-iron centrifugal pump delivering up to 46 gpm at 20 ft head and 100 ft maximum head, with 1-1/4 in NPT intake and 1 in NPT discharge

  • TypeDrain Components
  • 3/4 HP motor powers demanding drainage tasks
  • Cast iron housing resists corrosion for long service life
  • Three-phase 208-230/460V AC suits industrial power supplies
  • Delivers up to 46 gpm at 20 ft head for high-volume flow
  • Handles up to 100 ft maximum head for elevated discharge

Industrial three-phase centrifugal pump

The Dayton 4RJ73 is a cast-iron centrifugal pump rated at three-quarter horsepower for three-phase supplies of 208, 230 or 460 volts AC. Its open dripproof motor enclosure suits indoor industrial environments where liquid transfer or circulation is required. Intake and discharge connections use NPT threads sized at one and a quarter inch and one inch respectively.

Flow limits across head range

Maximum flow reaches 46 gallons per minute at 20 feet of head, then declines to 40 gpm at 40 feet, 31 gpm at 60 feet and 21 gpm at 80 feet. The pump can develop up to 100 feet of head, so flow will drop further beyond the published points. Buyers needing sustained output above 46 gpm or pressure beyond 100 feet of head must select a larger unit.

Three-phase voltage requirement

The motor operates only on three-phase power at 208, 230 or 460 volts AC, so it cannot be wired to standard single-phase mains. Installations without three-phase service will need a phase converter or a different pump. This voltage constraint is the decisive factor when choosing this model.

Highlights

  • 3/4 HP motor powers demanding drainage tasks
  • Cast iron housing resists corrosion for long service life
  • Three-phase 208-230/460V AC suits industrial power supplies
  • Delivers up to 46 gpm at 20 ft head for high-volume flow
  • Handles up to 100 ft maximum head for elevated discharge

Specifications

TypeDrain Components
BrandDayton
Model4RJ73

Questions about this item

Which flow-rate spec should I use to size this 3/4 hp Dayton pump for my system?

Use the head your piping creates: at 20 ft of head the pump delivers 46 gpm, at 40 ft it drops to 40 gpm, at 60 ft to 31 gpm, and at 80 ft to 21 gpm; maximum shut-off head is 100 ft.

What does the 46 gpm maximum flow figure mean once the pump is installed?

That 46 gpm is the open-discharge rate at only 20 ft of head; actual flow will fall as system head rises, so match your total dynamic head to the curve above.

What voltage options does the three-phase motor support and how does that affect wiring?

The motor is nameplated for 208-230/460 V AC three-phase; wire it to the incoming supply voltage using the appropriate connection diagram on the motor.

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