H Series Direct Spring Safety Valves

Direct Spring Operated Pressure Relief ValvesCrosby

Direct spring safety valves that provide comprehensive overpressure protection for ASME I and ASME VIII off-boiler steam safety applications

H-Series direct spring operated safety valves are the proven solution for comprehensive overpressure protection for steam safety applications including economizers, steam drums, superheaters, reheaters and more.

  • ASME/NB certified capacities for steam.
  • Set and tested on steam.
  • ISOFLEX seat tightness up to 96%.*
  • Tight shutoff.
  • Full nozzle flanged option.
  • Restricted lift for customized capacity.
  • Long service life.
  • Low maintenance.
  • Two ring set pressure and blowdown control.
  • Achieved under laboratory controlled conditions.

Technical Data


Spring Operated


Up to 2700.6 psig


Up to +1000°F


NPS 1-6



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