Final answer:
The king valve, or isolation valve, is a type of valve used in engineering applications. It is located at the main entry point of a system or a line and is used to control the flow of fluid or gas.
Step-by-step explanation:
The king valve, also known as the isolation valve, is a type of valve used in engineering applications.
It is typically located at the main entry point of a system or a line and is used to control the flow of a fluid or gas.
For example, in a plumbing system, the king valve is usually located near the water main and is used to shut off the water supply to the entire building.