What is the makeup of valve trim?

The makeup of valve trim is comprised of essential components that directly interact to control the flow of fluids within the valve. In this case, the correct choice includes the disc, seat ring, valve stem, and guide bushings, which are fundamental to the operation of a valve.

The disc is the primary component that opens or closes to regulate the flow. The seat ring provides a surface for the disc to seal against, helping to prevent leakage when the valve is closed. The valve stem connects the disc to the actuator or handle, allowing for the movement needed to open and close the valve. Guide bushings support the valve stem and ensure that it moves smoothly and accurately within the valve body, enhancing the valve's performance and longevity.

Understanding these components is crucial for power engineers, as they directly affect how valves operate in various systems, including steam, water, and gas. This knowledge contributes to effective maintenance and troubleshooting in industrial applications, ensuring safe and efficient operation of equipment.