This valve is able to change its orifice size to account for changes in cooling loads. Which valve is it?

The valve that is capable of changing its orifice size to accommodate varying cooling loads is a modulating valve. These valves are designed to adjust their opening based on feedback from the system, such as temperature or pressure changes. This dynamic adjustment allows the valve to maintain the desired flow rates and pressures in response to fluctuations in cooling demand, thereby optimizing system efficiency and performance.

Modulating valves often work in conjunction with control systems to ensure that the cooling needs are met without overworking the system, which contributes to energy savings and improved comfort levels. By modulating the flow, these valves help prevent issues such as freezing or overheating in the HVAC system.

In comparison, other types of valves like the automatic expansion valve and electronic expansion valve also adjust flow but in different manners. An automatic expansion valve operates based on the pressure difference between the evaporator and the condenser, while an electronic expansion valve uses electronic components to provide precise control but may not modulate in the same continuous manner as a modulating valve. A bleed valve is generally used for releasing pressure or allowing fluid to escape, rather than adjusting flow rates based on load changes.