A HVAC 3 Way Valve is a type of valve used in HVAC systems to control the flow of hot and cold air. It is a three-way valve, meaning it has three ports, one for the hot air, one for the cold air, and one for the mixed air. The valve is used to regulate the flow of air, allowing for the desired temperature to be achieved. The valve works by using a diaphragm to control the flow of air. When the diaphragm is moved, it opens and closes the ports, allowing for the desired temperature to be achieved. The valve is typically used in commercial and industrial HVAC systems, as it is more efficient than a two-way valve. It is also more reliable, as it can be adjusted more precisely than a two-way valve. HVAC 3 Way Valves are an essential part of any HVAC system, as they allow for the desired temperature to be achieved.