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).

General Selection Tools:

  • ESP-PLUS for B&G Centrifugal Pumps, Booster Pumps, Pump Accessories, and Air Separator
  • ESP-PARTS for replacement parts selection
  • ESP-TANKS Expansion tank selection
  • CAD Drawings for 2D and 3D dimensional drawings in many formats
  • ESP-PICV is a quick and easy way to size and select Ultra Setter Pressure Independent Control Valves using just their flow rate. It eliminates the need to sort through technical documents or catalogs to size the right control valves for your job. Simply enter your required flow rate and ESP-PICV shows you all of the Ultra Setter valves that can meet that flow. You can also find CAD models and valve submittals, and once you've made all of your selections click "Send" and you can request pricing from your local rep.

Heat Exchanger Product Selection

Steam + Water Pressure Reducing Values

Sizing Tools:

Report Bugs/Request Enhancements
Please email the following address to report issues and request enhancements: ebusiness.support@xyleminc.com

Consult your local Bell & Gossett Representative for additional assistance.