Minnesota Boiler License Practice Exam 2025 - Free Boiler License Practice Questions and Study Guide

The correct response indicates that valve seats, plugs, and bodies suitable for high pressure and high temperature hot water boilers must be constructed from materials such as cast steel, forged steel, or steel alloys. This is essential due to the extreme conditions these boilers operate under. High pressure and high temperature environments require materials that can withstand the mechanical stress and thermal expansion associated with such conditions. Steel-based materials provide the necessary strength, durability, and resistance to deformation that ensures safe and efficient operation.

Using low-pressure valves or plastic valves would not provide adequate safety and performance, as they may not be designed to handle the demanding conditions that high pressure and high temperature can impose. Brass or bronze valves might also not meet the requirements for certain high-pressure applications due to their relatively lower tensile strength compared to steel materials. Thus, the specific recommendation of cast steel, forged steel, or steel alloys is crucial for maintaining the integrity and reliability of the boiler system.