Kunkle Bailey 480/485/490 Relief Valve

A spring operated liquid relief valve available in all bronze, bronze with stainless steel trim or all stainless steel constructions.


  • Cartridge type assembly which can be withdrawn from the body without disturbing the spring setting, and hence relieving pressure, allows the seating surfaces to be cleaned without the need to reset the valve.
  • 480 is a bronze relief valve.
  • 485 is bronze with a renewable stainless steel seat and disc.
  • 490 is all stainless steel.
  • Spindle normally fitted with an ‘O’ ring to protect the spring, particularly on corrosive duties.

General Application

Typically, these valves are for use on positive displacement pumps, for relief or bypass duties. The spring cartridge assembly can be supplied separately for use as an integral pump bypass relief valve.

Technical Data

Material: Bronze, stainless steel
Sizes: ¾” to 3” (DN 20 to 80)
Connections: Threaded
Pressure range: 5 to 348 psig (0.35 to 24 barg)
Temperature range: -4°f to 500°f (-20°C to 260°C)