Aquatrol’s Series 560/570 valve line is a high-capacity safety valve used for boilers, piping lines and vessel protection. The valves are designed and engineered for heavy-duty industrial use. They are ASME approved and National Board flow rated for capacity.

Note: use V and UV Code Stamp logos


  • Designed for durability
  • 6 orifices – 12 sizes of piping options
  • Top-guided seating and discharge
  • Full nozzle; high-capacity levels
  • Excellent reseating characteristics with pivoting ball-post design
  • Short, tuned blowdown; can be adjusted with double ring to meet specific requirements
  • Heavy-duty hood and lever mechanism
  • Standard 17-7 stainless steel springs


  • 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 250 PSI. UV and NB stamped for unfired vessel protection. Protects or relieves air, gas and steam pressure.

Sizes: ¼” to 2¼”

Pressure and Temperature Limits:

  • National Board rated to 250#
  • Temperatures to 406 degrees F°


  • Stainless steel whetted trimming package (seat, disk and interiors)
  • O-ring seating (Teflon®, EDPM, Viton® or as specified)
  • Bubble-tight seating options
  • Anti-vibrating spring for lift lever
  • Packed lift lever
  • BPT pipe threading