We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Bronze relief valve with test lever, half-inch NPT threads

Dayton

Dayton 4KGZ8 Relief Valve 6 GPM 1/2 NPT

SKU CH-DRVS-GBB4K MPN 4KGZ8

Bronze relief valve protects positive-displacement pumps at 600 psi with a 304 stainless-steel seat and spring

  • TypeDrain Components
  • Bronze body resists corrosion in demanding plumbing systems
  • Factory-set 600 psi protects positive-displacement pumps from over-pressure damage
  • 304 stainless-steel seat and spring ensure durable sealing performance
  • Integrated test lever allows quick functional verification without disassembly
  • Compact 4-inch height fits tight installations while delivering 6 GPM flow

Relief Valve for Positive Displacement Pumps

The Dayton 4KGZ8 is a bronze relief valve designed to protect positive displacement pumps from over-pressure damage. It suits installers and maintenance teams who need a factory-set safety device for hydraulic or fluid systems. The valve opens at a predetermined limit to divert excess flow and prevent equipment failure. Buyers who require adjustable pressure settings or electronic monitoring should look elsewhere.

Factory Set Pressure and Bronze Construction

The valve is factory set at 600 psi and uses a bronze body with 304 stainless steel seat and spring materials for corrosion resistance. A test lever is included for manual verification of operation without system shutdown. The fixed pressure setting means the valve activates consistently under normal use conditions. No external power or control signal is needed for the relief function.

Included Test Lever for Field Checks

The bundled test lever allows operators to confirm valve lift and reseat performance during routine inspections. This mechanical feature replaces the need for separate test equipment or pressure gauges during basic checks. The lever does not alter the factory pressure setting or provide flow measurement. Systems requiring remote indication or data logging will need additional instrumentation.

Highlights

  • Bronze body resists corrosion in demanding plumbing systems
  • Factory-set 600 psi protects positive-displacement pumps from over-pressure damage
  • 304 stainless-steel seat and spring ensure durable sealing performance
  • Integrated test lever allows quick functional verification without disassembly
  • Compact 4-inch height fits tight installations while delivering 6 GPM flow

Specifications

TypeDrain Components
BrandDayton
Model4KGZ8

Questions about this item

How do I install the 1/2 NPT relief valve on my pump discharge line and what step is often missed?

Thread the valve into the 1/2 NPT port on the discharge side of the positive displacement pump, using pipe sealant on the male threads, then tighten to the recommended torque; the step often missed is verifying the factory set pressure of 600 psi matches the pump's maximum allowable working pressure before commissioning.

What maintenance or replacement will the bronze relief valve with 304 stainless steel seat and spring need over time?

Inspect the test lever annually by lifting it to confirm the valve opens and reseats cleanly; replace the valve if the seat or spring shows corrosion, if the valve weeps at system pressure, or if it fails to open at the 600 psi set point during testing.

What is the first limit that appears when the valve operates continuously at its 6 GPM capacity?

The valve is factory set to open at 600 psi, so sustained flow at 6 GPM will not exceed that pressure setting; the limiting factor is the pump's ability to maintain flow without exceeding the 600 psi relief threshold.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.