Steam Specialties

Water Vents Model 77, 78, 79

Model 77 Part No. 401497
Water  Vent Valve

  • For efficient releasing of air in hydronic heating systems, such as baseboard radiators, convector radiators and small heating units
  • 1⁄8″ NPT straight shank
  • Maximum operating pressure 50 psig (3.5 bar)*
  • Maximum temperature 240°F (116°C)

Model 78 Part No. 401485
Water Main Vent Valve

  • For use on high pressure hot or cold water or glycol mains and process applications with specific gravity greater than 0.7
  • Cast brass body
  •  Tapped at top for 1⁄8″ NPT safety drain connection for discharging moisture
  • Body unscrews for easy cleaning
  • Built-in Check Valve
  • 3⁄4″ NPT straight shank
  • Maximum operating pressure 150 psig (10.3 bar)*
  • Maximum hydrostatic pressure 450 psig (31.1 bar)
  • Maximum temperature 250˚F (121˚C)

Model 79 Part No. 401488
Water Main Vent Valve

  • For use on hot or cold or glycol water mains and process applications with specific gravity greater than 0.7
  • Tapped at top for 1⁄8″ NPT safety drain connection for discharging moisture
  • Removable top
  • Built-in Check Valve
  • 1/2″ NPT female and 3⁄4″ NPT male straight shank
  • Maximum operating pressure 75 psig (5.2 bar)*
  • Maximum hydrostatic pressure 200 psig (13.8 bar)
  • Maximum temperature 250˚F (121˚C)

*Drop away pressure (maximum pressure against which the vent can open).

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