Spirax-Sarco 61685 Thermostatic Air Vent 1/2" NPT VS204

The Spirax-Sarco 61685 VS204 1/2 inch thermostatic air vent is a crucial component utilized in steam heating systems, commonly found in various HVAC equipment such as boilers and radiators. A thermostatic device is used in this air vent to regulate its expansion and contraction in response to temperature variations. When air builds up in the system, the thermostatic element expands due to the growing temperature, letting the air out through the vent. The thermostatic element contracts to close the vent and stop steam loss after the air is released and the temperature returns to normal. Effective air evacuation from the system is made possible by the Spirax-Sarco 61685 air vent, which also ensures proper steam distribution and guards against problems like air lock and decreased heating effectiveness. Its dependable operation enhances system functionality and energy savings.