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The primary type of metering device used in high-pressure chillers is the thermostatic expansion valve. This device plays a crucial role in regulating the flow of refrigerant into the evaporator based on the cooling demand and temperature within the system. It optimally adjusts the refrigerant flow by responding to the temperature of the refrigerant exiting the evaporator, ensuring that the system operates efficiently and maintains the desired temperature levels.

Thermostatic expansion valves are particularly suitable for high-pressure chillers due to their ability to handle varying load conditions effectively. They provide a precise control mechanism that allows for a consistent and reliable cooling process, which is essential in commercial applications.

In contrast, while electronic expansion valves offer advanced control features, they are less commonly utilized in traditional high-pressure chillers compared to thermostatic expansion valves. Capillary tubes, although used in some refrigerant systems, lack the flexibility needed for varying load conditions, making them less effective for high-pressure applications. Flow control valves, meanwhile, serve different purposes in a refrigerant circuit and do not operate as metering devices for refrigerant flow in chillers.