What is a King value in refrigeration systems?

A King valve, often referred to in the context of refrigeration systems, is a combination shut-off and service valve. This type of valve is specifically designed to serve two primary functions: it allows for the shutdown of refrigerant flow in the system (shut-off function) and also provides access for service or maintenance of the refrigerant system without the need to dismantle other components.

This is particularly useful during repairs, as it enables technicians to safely isolate sections of the refrigeration system while still maintaining the ability to service it. By integrating these two functions, the King valve enhances efficiency and safety during maintenance.

Other options do not correctly describe the function or nature of a King valve in refrigeration systems. While one might think of temperature regulation or pressure measurement in the context of refrigeration, those characteristics do not pertain to the specific role of a King valve, which combines shut-off and service functionalities.