Our 560/570 valve line is a high capacity safety valveused for boilers, piping lines and vessel protection. Designed and engineered for heavy-duty industrial use. ASME approved and National Board flow-rated for capacity.

Series 560

Use for ASME Section I applications to pressure ratings of 250 PSI. {V} and {NB} stamped for fired vessels. Boilers, or most areas where steam safety valves are required.

Series 570

Use for ASME Section VIII applications to pressure ratings of 300 PSI. {UV} and {NB} stamped for unfired vessel protection. Used for many applications to protect or relieve pressure for Air, Gas or Steam.

Series 563-573

Stainless steel whetted trimming.



Steam Boilers, Air Compressors, Dryers, Receivers, Pressure Vessels, Piping Systems, Accumulators, Reducing Stations, Tanks, Inter/After Coolers, Cooking Equipment, Autoclaves, Sterilizers or wherever higher capacity pressure protection or relief may be required.


  • Designed for durability
  • 6 orifices – 12 sizes of piping options
  • Top guided seating and discharge
  • Full nozzle; high capacity levels
  • Excellent re-seating characteristics with ball-post pivoting design
  • Short, tuned blow-down with dual-ring technology
  • Heavy duty hood and lever mechanism
  • Standard 17-7 stainless steel springs


  • O-ring seating options (see charts)
  • Packed lift lever
  • Stainless steel trimming package nozzle (body), disk (all sizes)
  • O-ring seating. (PTFE, EDPM, Viton, or as specified)
  • Bubble tight seating options
  • Anti vibrating spring for lift lever
  • BSPT pipe threading




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