Xylem 699854 Thermostat Assembly for Float & Thermostatic Steam Trap 30-175 PSIG

The Xylem 699854 is a replacement thermostat assembly designed for float and thermostatic (F&T) steam traps operating at pressures from 30 to 175 PSIG. This critical component serves as the thermostatic air vent element that enables F&T traps to automatically discharge air and non-condensable gases from steam systems.

Key Features:

• Pressure rating: 30-175 PSIG service range
• Direct replacement thermostat assembly for Hoffman/Xylem F&T steam traps
• Thermostatic element opens when temperature drops below saturation point
• Enables efficient air venting during system start-up and operation
• Essential component for maintaining proper steam trap operation

Float and thermostatic steam traps utilize two separate mechanisms: a float-operated valve for continuous condensate drainage and a thermostatic air vent for removing air and gases. The thermostat assembly responds to temperature changes, opening when cooler air accumulates and closing when steam temperature is reached. This allows the trap to handle large volumes of air during start-up while preventing live steam loss during normal operation. Regular replacement of worn thermostat assemblies ensures optimal trap performance and energy efficiency in steam heating and process applications.