Which of the following valves is typically used as a stop valve in a high-pressure boiler?

A gate valve is typically used as a stop valve in a high-pressure boiler due to its design, which allows for minimal resistance to fluid flow when fully opened. Gate valves are specifically engineered to be either fully open or fully closed, providing a clear on/off control of the fluid. This feature is crucial in high-pressure applications, as it minimizes pressure drops and maintains system efficiency.

The construction of a gate valve includes a sliding gate or wedge that moves perpendicularly to the flow direction, allowing for a tight seal when closed. This sealing capability is vital in high-pressure environments to prevent leaks and maintain safe operational conditions. In comparison to other types of valves, such as check valves or ball valves, a gate valve's design is better suited for applications where it will be either fully opened or completely closed, rather than frequently throttled.

In high-pressure boiler systems, safety and reliability are paramount, and the use of a gate valve provides the necessary control required for isolating sections of the system while ensuring the integrity and stability of the pressure within the boiler.