Hoffman Specialty Water Vents Model 77, 78, 79

Bell & Gossett : Steam Specialties : Vents

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).

Bell & Gossett is a leading manufacturer of pumps, valves, heat exchangers, and accessories for plumbing, wastewater, and HVAC—including steam and heat transfer—applications. To build and operate an efficient water system, you need both the right products and experts who know the application. Here, you can access Bell & Gossett’s trusted network of partners who have the experience you need to get the job done right.

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