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Yarway Blow-off Valves
Blow-off Valves
Designed for blow-off service in boiler systems with pressures of 3206 psig.
Yarway Blow-off Valves


Critical Service
Cavitation, Dirty Service, Flashing
Flow Characteristics
Special Characterization
Carbon Steel, Cast Iron, Metal, Steel
Shutoff Class
Class V (FCI 70-2)
Valve Size
NPS 2-1/2 / DN 65, NPS 2 / DN 50, NPS 1-1/4 / DN 32, NPS 1-1/2 / DN 40, NPS 1 / DN 25
Valve Size Standard
Valve Type
Globe, Angle
ASME B31.1
End Connection


  • Designed according ASME section 1, ASME B31.1, ASME B16.34.
  • For boiler systems up to 3206 psig.
  • Rugged construction to withstand high pressure and high velocities.
  • Excellent resistance to cleaning acids and wear caused by precipitated solids.
  • No Seat, will not score or plug with dirt, will not leak
  • loaded packing, will not leak after packing
  • Combination of hardseat and seatless valves in a single body.
  • Stellite seat faces
  • Stellite seat faces