Armstrong International A9739 Air Vent

The Armstrong International A9739 Thermostat Air Vent is a critical OEM replacement part designed specifically for "A", "K", "J", and "L" Series float and thermostatic steam traps. Built for high-demand environments, this steam trap air vent effectively discharges non-condensable gases and CO2, preventing air binding and ensuring efficient heat transfer throughout your steam system. It features a balanced pressure phosphor-bronze thermostatic wafer caged in rugged stainless steel, allowing it to operate reliably at operating pressures ranging from 30 to 175 psig.

As a veteran contractor, you know that performance hinges on proper venting. The Armstrong A9739 responds precisely to the pressure-temperature curve of steam, automatically opening to vent air and closing tight as soon as steam reaches the element. Whether you are servicing a 30A3 or a 175J8 model, this thermostatic air vent kit includes the required gasket for a leak-free installation, maintaining the integrity of the steam chamber and optimizing energy efficiency in commercial and industrial piping applications.

• Universal Compatibility: Specifically engineered for Armstrong F&T Trap Series A, K, J, and L.
• Industrial Durability: Features a corrosion-resistant stainless steel cage and phosphor-bronze bellows for extended service life.
• Optimized Steam Efficiency: Rapidly removes air to prevent cold spots and ensure consistent temperature control.
• Simplified Maintenance: Direct-fit replacement part that includes the gasket for immediate field installation.
• High Pressure Rating: Rated for a maximum allowable pressure of up to 300 psig at 365°F.

Which steam trap models is the A9739 compatible with?
The A9739 is designed for use in most Armstrong "A", "K", "J", and "L" series float and thermostatic steam traps, including popular models like the 30A, 75A, 125A, 175A, and J/K counterparts.

Does this kit include the necessary gaskets?
Yes, the A9739 kit is supplied with the required gasket to ensure a secure, pressure-tight seal upon installation.

How do I know if my thermostatic air vent has failed?
Common signs of failure include air binding (trap or heat exchanger remaining cold) or steam blowing through the vent if the element is ruptured and cannot close.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.