Steamfitter Certificate of Qualification (CFQ) 2026 – 400 Free Practice Questions to Pass the Exam

In a large chiller requiring constant flow, a thermostatic metering valve is rarely utilized because these systems typically operate with a constant evaporator load. Instead of adjusting the refrigerant flow based on varying thermal loads as a thermostatic metering valve would do, large chillers tend to use other forms of control, such as constant flow devices or electronic expansion valves. These systems are designed for efficiency and stability in environments where the cooling demand doesn't fluctuate significantly.

In contrast, small commercial units, domestic refrigerators, and split air conditioning systems often experience varying cooling demands and thus benefit more from the precise control a thermostatic metering valve offers to optimize the refrigerant flow and enhance efficiency.