Kunkle Safety Relief Valves Models 6252 and 6254

ASME Section I Steam and ASME Section VIII, Air, Steam and Gas “UV” National Board Certified. Model 6254 ASME Section IV “HV,” National Board Certified. PED Certified for Non-Hazardous Gas.

Model 6252: Cast iron, enclosed spring, SS trim.

Model 6254: Same as model 6252 except certified for ASME Code Section IV – Low pressure steam heating boilers. Set 15 psig [1.0 barg] only. J through P orifice only.

Product Features

  • Heavy duty construction of high quality cast iron with stainless steel semi-nozzle trim and disc
  • Bolted bonnet design for easy maintenance
  • Seats lapped to optical flatness
  • Heavy duty lift lever assembly
  • Dual control rings offer easy adjustability for precision opening with minimum preopen or simmer and exact blowdown control


  • Sizes 1 1/2″ to 6″
  • Model 6252: Pressures from 10 to 250 psig; Temperatures from -20° to 406°F
  • UV Stamp, V Stamp, HV Stamp


  • Air
  • Gas
  • Steam


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