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Brass relief valve with test lever, 3/4 NPT connections

Dayton

Dayton 4KGZ9 Relief Valve 13 GPM 3/4 NPT

SKU CH-QKQG-GGHQ1 MPN 4KGZ9

Relief valve protects positive-displacement pumps with a 13 GPM flow capacity and 150 psi factory setting

  • TypeDrain Components
  • Prevents pump damage with factory-set 150 psi relief
  • 13 GPM flow capacity handles high-volume systems
  • 3/4 NPT connections fit standard plumbing installations
  • 304 stainless steel seat resists corrosion long-term
  • Nylon body with steel spring ensures reliable operation

Purpose and Fit

The Dayton 4KGZ9 is a relief valve designed to protect positive displacement pumps from over-pressure damage. It suits maintenance teams and system integrators who need a preset safety device for fluid lines rated at 13 GPM with 3/4 NPT connections.

Included Test Lever

A test lever ships with the valve so operators can verify opening function without disassembly. This accessory supports routine inspection schedules and helps confirm the factory-set 150 psi release point remains accurate over time.

Construction and Connections

The body uses nylon while the seat is 304 stainless steel and the spring is steel, giving chemical compatibility for many industrial fluids. Both inlet and outlet are 3/4 NPT, allowing direct threading into existing pipework without adapters, and the compact 5 1/4 in height fits tight mechanical rooms.

Highlights

  • Prevents pump damage with factory-set 150 psi relief
  • 13 GPM flow capacity handles high-volume systems
  • 3/4 NPT connections fit standard plumbing installations
  • 304 stainless steel seat resists corrosion long-term
  • Nylon body with steel spring ensures reliable operation

Specifications

TypeDrain Components
BrandDayton
Model4KGZ9

Questions about this item

How often does the factory-set 150 psi spring need checking or replacement?

The spring is steel and set at 150 psi; inspect annually and replace if pressure readings drift or the test lever fails to reseat cleanly.

What limits continuous flow through this 13 GPM valve?

The 13 GPM rating is the maximum flow; sustained operation above that rate will cause pressure drop and premature seat wear on the 304 stainless steel seat.

Does the nylon body heat up or make noise during all-day pump protection duty?

Nylon body stays cool at 150 psi set pressure; the test lever may click during relief cycles but no continuous noise or heat build-up occurs.

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