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Yarway 29 and 129Y Thermodynamic Steam Trap
Yarway 29 and 129Y Thermodynamic Steam Trap
Series 29 and 129Y steam traps retain all the essential benefits of disc trap performance – they are compact, easy to install, self-draining and unaffected by water hammer or freezing, while providing the economy of integral seat design.
Constructed of all stainless steel, the trap has only three parts; disc, body and bonnet. Simplification, made possible by incorporating the trap seat in the body, results in lowest possible cost per unit for this non-repairable steam trap.
Yarway 29 and 129Y Thermodynamic Steam Trap


Thermodynamic (Disk)
NPS 1/4, 3/8, 1/2, 3/4, and 1 / DN 8, 10, 15, 20, and 25
Maximum Temperature
750°F (400°C)
Operating Pressure
4 to 600 psig (0.3 to 41 bar)
Back pressure
1/4", 3/8", 1/2" 29 and 3/4" 299A: Up to 70% of inlet pressure, psia/bar 3/4", 1" 29: up to 50% of inlet pressure, psia/bar 129Y: up to 80% of inlet pressure, psia/bar
Up to 10,580 lb/hr (4800 kg/hr)
Stainless Steel


  • Freeze Proof
  • Unaffected by water hammer
  • Discharge temperature follows saturation curve
  • Hardened stainless steel construction provides exceptional corrosion resistance
  • Open failure mode prevents water hammer in steam distribution mains
  • Withstands superheat
  • Self-draining (vertical mount)
  • Single moving part


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