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Cast iron rotary gear pump head with half inch NPT inlet and half inch shaft

Dayton

Dayton 6DHH8 Rotary Gear Pump Head Trap 40 psi

SKU CH-TRMT-AEYD3 MPN 6DHH8

Rotary gear pump head in cast iron with 1/2 in NPT connection, rated to 40 psi and 375 °F maximum

  • TypeDrain Components
  • Cast iron body resists wear for long service life
  • 40 psi maximum pressure handles demanding fluid transfer tasks
  • 1 ft suction lift enables flexible installation positioning
  • Viton lip seal withstands temperatures up to 375 °F
  • Compatible with carbonator mount motors for direct drive simplicity

Rotary Gear Pump Head 40 psi

The Dayton 6DHH8 is a rotary gear pump head built for fluid-transfer duties where a cast-iron body and Viton lip seal suit the media. It mounts on a carbonator-compatible motor frame and accepts a 1/2 inch NPT connection, making it a direct fit for existing plumbing in commercial or light-industrial settings.

Installation and common pitfalls

The pump head slips onto a 1/2 inch shaft and threads into 1/2 inch NPT pipework, so alignment and thread sealing are the only mechanical steps. The 5.1 ft maximum suction lift means the liquid source must sit close to the inlet, and the 100 SUS viscosity ceiling rules out thicker oils or syrups without a heated line or a different pump.

Practical limits of the interface

Operating pressure tops out at 40 psi and temperature ranges from 40 to 375 degrees F, so the head cannot serve high-pressure washdown or steam circuits. The 1/3 hp motor requirement sets a firm floor on driver sizing, and the spur-gear design is not suited for abrasive slurries or shear-sensitive fluids that demand a gentler pumping action.

Highlights

  • Cast iron body resists wear for long service life
  • 40 psi maximum pressure handles demanding fluid transfer tasks
  • 1 ft suction lift enables flexible installation positioning
  • Viton lip seal withstands temperatures up to 375 °F
  • Compatible with carbonator mount motors for direct drive simplicity

Specifications

TypeDrain Components
BrandDayton
Model6DHH8

Questions about this item

How do I confirm the Dayton 6DHH8 pump head is operating correctly after installation?

Verify the motor runs without abnormal noise, the outlet pressure does not exceed 40 psi, the fluid temperature stays between 40 and 375 degrees F, and the suction lift remains within 5.1 ft.

What comes in the box with the Dayton 6DHH8 and what must I supply separately?

The package includes the cast-iron rotary gear pump head with Viton lip seal, 1/2 in NPT connections and 1/2 in shaft; you must provide a compatible carbonator-mount motor rated at 1/3 hp.

Which version of the Dayton 6DHH8 should I choose for a system limited to 40 psi?

The 6DHH8 is rated for a maximum operating pressure of 40 psi, making it the correct selection for that pressure limit.

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