1/8" Adjustable Angle Steam Radiator Air Valve

Hoffman 401422 Adjustable Steam Radiator Air Vent – 1/8" Angle Pattern

The Hoffman 401422 is an angle-mounted adjustable air vent designed for low-pressure steam radiator applications. Featuring six venting rate positions, this float-type valve enables controlled air release to balance steam distribution across radiators, helping improve system efficiency and occupant comfort in residential or light commercial systems.

Its internal float mechanism prevents water carryover from entering the vent, reducing the risk of clogging and maintaining consistent operation. The unit is designed for steam pressures up to 11.2 PSIG and temperatures up to 240°F, making it suitable for standard one-pipe steam systems that require variable venting capacity to address uneven heating.

Key Features

• Adjustable Output: Six-position venting selector for tailored air release rates
• Float-Controlled Venting: Prevents condensate from passing into vent outlet
• Angle Connection: 1/8 in. MNPT thread for installation on radiator side taps
• Application: Balances heat delivery across radiators by regulating vent rate
• Material: Corrosion-resistant internals for extended service life in steam environments

Technical Specifications

• Model: 401422
• Connection Size: 1/8 in. MNPT
• Mount Type: Angle
• System: Low-pressure steam radiator
• Operating Pressure: Up to 11.2 PSIG
• Temperature Range: 140°F to 240°F
• Venting Type: Float-style with adjustable port selector

Installation Considerations

Install on the radiator's side tapping using thread sealant rated for steam systems. Ensure the vent body is upright for proper float operation. Select the appropriate venting rate based on radiator location and required heat output. Valve can be field-adjusted without removal. For best results, follow system balancing procedures recommended for one-pipe steam systems.

Applications

• Residential one-pipe steam radiator systems
• Balancing heat distribution across zones with varying demand
• Steam radiators requiring variable air release for performance optimization