Description
The Armstrong International 75A3 is a Series A Cast Iron Float & Thermostatic (F&T) Steam Trap engineered for dependable, continuous condensate discharge in a wide range of steam heating and process applications. With a standard 3/4″ NPT connection and a maximum allowable pressure of 75 PSI, this trap is built to handle demanding commercial and industrial steam systems with ease.
Key Features
- Series A cast iron body construction for long-lasting durability in steam service
- 3/4″ NPT standard connection for straightforward installation and compatibility with common piping configurations
- 75 PSI maximum working pressure rating
- 11/64″ orifice for precise, efficient condensate flow control
- Integrated thermostatic air vent automatically purges non-condensable gases and air, improving system efficiency and reducing water hammer
- Float & thermostatic design provides continuous, modulating condensate discharge — no slugging or steam loss
- Suitable for steam heating coils, unit heaters, heat exchangers, and similar HVAC and process equipment
How Float & Thermostatic Traps Work
The F&T trap uses a float mechanism that rises and falls with condensate level, opening the discharge valve continuously as condensate accumulates. The separate thermostatic element responds to temperature differences between steam and sub-cooled condensate, ensuring air and non-condensable gases are vented at startup and during operation. This dual-action design eliminates air binding, reduces energy waste, and protects downstream equipment.
Specifications
- Brand: Armstrong International
- Model / SKU: 75A3
- Series: A
- Body Material: Cast Iron
- Connection Size: 3/4″ NPT
- Connection Type: Standard (NPT)
- Maximum Working Pressure: 75 PSI
- Orifice Size: 11/64″
- Trap Type: Float & Thermostatic (F&T)
- Air Vent: Thermostatic air vent included
Applications
- Commercial and industrial steam heating systems
- Unit heaters and convectors
- Steam coils and heat exchangers
- Process heating equipment
- HVAC steam distribution systems
