Chill Out and Smash the Refrigeration Plant Operator B Test 2025 – Cool Down Your Future!

The control device that restricts liquid flow from the condenser to the evaporator is the capillary tube. A capillary tube functions as a metering device in many refrigeration systems, particularly in systems that operate with low refrigerant flow. Its narrow diameter creates a pressure drop, which helps control the amount of refrigerant that enters the evaporator. This allows for optimal performance by ensuring that the evaporator does not become flooded with too much liquid refrigerant, which could reduce system efficiency and cooling capacity.

In contrast, while the expansion valve also regulates the flow of refrigerant, it does so using a more complex mechanism that involves sensing temperature or pressure changes to adjust its opening. A flow meter is designed to measure the rate of refrigerant flow rather than to control it. The thermostatic switch is used for regulating temperature by providing on/off control signals but does not directly control liquid flow from the condenser. Thus, the capillary tube serves a specific role in restricting flow in a straightforward and effective manner.