霍夫曼专业蒸汽排气阀
Hoffman Specialty Steam Vents

美国贝尔-高赛特
Bell & Gossett

Model 4A Part No.401413 Air Valve (non-vacuum)

Float-type thermostatic vent
For residential or small one-pipe or two-pipe systems
Single non-adjustable port
1/2 NPT female and 3/4 NPT male straight shank
Install 6-10? (150-250mm) above horizontal return and 18? (450mm) above the boiler water line
Maximum operating pressure 2 psig (0.13 bar)*
Maximum pressure 10 psig (0.7 bar)

Model 75 Part No. 401434 75H Part No. 401437 Air Valve (non-vacuum)

Float-type thermostatic vent
For medium and large systems
Single non-adjustable port
1/2 NPT female and 3/4 NPT male straight shank
Maximum operating pressure*
- Model 75 3 psig (0.2 bar)
- Model 75H 10 psig (0.7 bar)
Maximum pressure 15 psig (1.0 bar)

Model 76 Part No. 401431 Vacuum Valve

Float-type themostatic vent
For medium and large one-pipe vacuum systems • Single non-adjustable port
1/2 NPT female and 3/4 NPT male straight shank
Install 6-10? (150-250mm) above horizontal return and 8? (450mm) above the boiler water line
Maximum operating pressure 3 psig (0.2 bar)
Maximum pressure 15 psig (1.0 bar)

Special Steam Vents

Model 3 Part No. 401419 Steam Air Line Valve
Thermostatic vent (no float)
For Air Line or Paul Systems
Inlet 1/8 NPT, outlet 1/4 NPT
Maximum operating pressure 25 psig (1.7 bar)* to vacuum
Maximum pressure 25 psig (1.7 bar)

Model 4 Part No. 401416 Quick Valve

Thermostatic air vent
For steam systems and process equipment
Operates on temperature change only; does not close against water
Must be installed 6-10? (150-250mm) above horizontal return and 18? (450mm) above the boiler water line
1/2 NPT female and 3/4 NPT male straight shank
Maximum operating pressure 25 psig (1.7 bar)*
Maximum pressure 25 psig (1.7 bar)

Model 74 Part No. 401429 Steam Unit Heater Air Valve

Float-type thermostatic vent • Single non-adjustable port
1/2 NPT female and 3/4 NPT male straight shank
Install 6-10? (150-250mm) above horizontal return and 18? (450mm) above the boiler water line
Maximum operating pressure 35 psig (2.4 bar)*
Maximum pressure 35 psig (2.4 bar)

Parts Lists

HS 800C Hoffman Specialty Service Parts Catalog

Catalog Pages

HS 900E Hoffman Specialty General Catalog

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

霍夫曼专业蒸汽排气阀Hoffman Specialty Steam Vents

霍夫曼专业蒸汽排气阀
Hoffman Specialty Steam Vents