Kunkle Models 300 And 600 Safety Valves

Safety And Relief Products

Cast steel, exposed spring valves that meet ASME section I for steam and ASME section VIII for air, gas and steam services


  • Heavy duty construction of high quality cast steel with stainless steel full-nozzle trim for optimum performance.
  • Bolted yoke design for easy maintenance.
  • Steel yoke incorporates a 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.
  • Heavy duty lift lever assembly.
  • All adjustments are factory sealed to help prevent tampering or disassembly.
  • Each valve tested and inspected for pressure setting and leakage.
  • Gags available.

General Application

Suitable for use on steam boilers and generators, pressure reducing stations, reciprocating or rotary air/gas compressors and for pressure vessels including tanks, receivers, intercoolers, oil/gas separators and lines.

Technical Data

Model 300: 300# inlet flange and 150# outlet flange per ANSI B16.5
Model 600: 600# inlet flange and 150# outlet flange per ANSI B16.5
Temperature range[1,2]: -20° to 800°F (-29° to 427°C)
Pressure range[1]: 15 to 1000 psig (1 to 69 barg)
Code: ASME I and VIII


1. See page 3 for pressure and temperature limits table.
2. Alloy steel spring required for temperatures > 750°F.