Our 560 / 570 valve line is a high capacity safety valve used 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 563

Same as Series 560 except with Stainless Steel wetted trimming (Nozzle and disk).

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 573

Same as Series 570 except with Stainless Steel wetted trimming (Nozzle and disk).


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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