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Bronze relief valve with 304 stainless steel seat and spring, 40 GPM, 400 psi

Dayton

Dayton 4KHA2 Relief Valve 40 GPM 400 psi Bronze Body 304 SS Seat Spring

SKU CH-NVFM-F68WG MPN 4KHA2

Bronze relief valve rated for 40 GPM at 400 psi with 304 stainless steel seat and spring

  • TypeDrain Components
  • Protects positive-displacement pumps from over-pressure damage with a 400 psi factory setting
  • Delivers up to 40 GPM flow capacity for reliable system performance
  • Bronze body resists corrosion in demanding plumbing installations
  • 304 stainless-steel seat and spring maintain sealing integrity over long service life
  • Test lever included for quick manual verification of valve operation

Pressure-relief valve for pump protection

This bronze-body relief valve is factory-set at 400 psi and rated for 40 GPM flow. It uses 304 stainless-steel seat and spring components for corrosion resistance. A test lever is included for manual verification of operation. The valve connects via 1 NPT inlet and 3/4 NPT outlet.

Suited for positive-displacement pump systems

Installers protecting positive-displacement pumps from over-pressure damage will find the preset rating and flow capacity appropriate. Systems requiring adjustable pressure settings or different port configurations should consider other valve types. The bronze construction fits standard industrial plumbing layouts.

Factory-set 400 psi relief pressure

The non-adjustable 400 psi setting is the critical specification that determines whether this valve matches the system design pressure. Verify the pump’s maximum allowable working pressure before selection. No field adjustment is possible on this model.

Highlights

  • Protects positive-displacement pumps from over-pressure damage with a 400 psi factory setting
  • Delivers up to 40 GPM flow capacity for reliable system performance
  • Bronze body resists corrosion in demanding plumbing installations
  • 304 stainless-steel seat and spring maintain sealing integrity over long service life
  • Test lever included for quick manual verification of valve operation

Specifications

TypeDrain Components
BrandDayton
Model4KHA2

Questions about this item

How is the 1 NPT inlet and 3/4 NPT outlet relief valve installed, and what step is often missed?

Thread the 1 NPT inlet into the pump discharge line and the 3/4 NPT outlet to a safe drain, using pipe sealant on male threads only; the step often missed is verifying the factory-set 400 psi matches the pump's maximum allowable working pressure before pressurising the system.

What maintenance or replacement will the bronze body valve with 304 stainless steel seat and spring need later?

Inspect the test lever annually for free movement and check the seat for leakage; replace the valve if the seat shows erosion or if the spring no longer holds the 400 psi set pressure during testing.

What limit appears first when the valve operates at its 40 GPM capacity under sustained flow?

The 400 psi factory-set pressure limit is reached first; once system pressure hits 400 psi the valve opens to relieve up to 40 GPM, preventing pressure from rising further.

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