Kunkle Cast Steel Safety Valve Models 300, 600 Certified Valves

Forged from heavy-duty cast steel with a stainless steel nozzle, these safety valves are certified for air, gas and steam. Used in steam boilers, steam generators, air compressors, gas compressors, pressure tanks, pressure receivers, intercoolers, and oil/gas separators, these sturdy valves contain a bolted yoke design for easy maintenance.

Model Descriptions:

ASME Section I Steam and ASME Section VIII Air/Gas/Steam Valves

  • Model 300: Cast steel, exposed spring, full nozzle with stainless steel (SS) trim. ANSI 300# inlet flange and 150# outlet flange.
  • Model 600: Cast steel, exposed spring, full nozzle with SS trim. ANSI 600# inlet flange and 150# outlet flange.


  • Heavy-duty construction of high-quality cast steel with SS full-nozzle trim for optimum performance.
  • Bolted yoke design for easy maintenance.
  • Steel yoke incorporates cover shield for guiding surfaces and provides for fully exposed spring.
  • Seats lapped to optical flatness for tight shutoff.
  • Dual control rings offer easy adjustability for precision opening with minimum pre-open or simmer and exact blowdown control.
  • Adjustments are factory sealed to help prevent tampering or disassembly.
  • Each Kunkle valve is tested and inspected for pressure setting and leakage.


  • Steam boilers and generators.
  • Pressure-reducing stations.
  • Air/gas compressors — reciprocating or rotary.
  • Pressure vessels — including tanks, receivers, intercoolers, oil/gas separators, lines.

Please refer to the Kunkle Catalog or Contact Us for additional information.

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