美国进口
Imported from USA

霍夫曼专业水排气阀型号77, 78, 79
Hoffman Specialty Water Vents Model 77, 78, 79


美国贝尔-高赛特
Bell & Gossett

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 offers several useful engineering tools for easy sizing of every area of a building. Simple to navigate software gives you accurate information and up-to-date documentation downloadable straight into your submittal package.

Some tools require a registered account: New User Registration | Existing User Password Help

ESP-Design Plus Bell & Gossett: Multi-Stage, Pressure Booster Packages, Wastewater, Vertical Turbines
ESP-Plus Bell & Gossett Pump Selection: Circulators, End Suction, Closed-Coupled, Inline, Double Suction
ESP-Tanks Bell & Gossett Compression/Expansion Tanks and Accessories (downloadable app)
ESP-Thermal Bell & Gossett Gasket Plate & Frame and, Brazed Plate Heat Exchangers
ESP-UTUBE Bell & Gossett U-Tube Heat Exchangers
ESP-Parts Parts Selection
Steam-2000 Steam 2000 Selection
Steam-1140 Series 1140 Steam Service Regulators
Water-1140 Series 1140 Water Service Regulators
Steam-Traps Steam Traps Selection
CAD Drawings CAD Drawings
System Syzer System Syzer (available online, PC download, and iOS app)
System Syzer Psychrometry System Sizing related to coil cooling (link downloads .exe file)
Steam-Pipe Steam Pipe Sizing
Steam-Loss Steam Loss Through Failed Trap
Flash-Steam Flash Steam Sizing
Condensate-Pipe Condensate Pipe Sizing
Mobile Catalog iOS iPhone & iPad Mobile Product Catalog
Mobile Catalog Android Android Device Mobile Product Catalog