Minnesota Boiler License Practice Exam

What valve must relieve all excess pressure on a steam or high pressure water boiler?

1. Safety valve and/or an A.S.M.E. approved safety valve

2. Safety valve and/or liquid relief valve

3. Steam safety valve only

4. A liquid relief valve only

The correct answer is: Safety valve and/or an A.S.M.E. approved safety valve

The correct choice is based on the requirement that a steam or high-pressure water boiler must have a valve specifically designed to prevent excessive pressure buildup. The safety valve is crucial because it automatically releases steam or water if the pressure exceeds a predetermined limit, thus protecting the boiler and preventing possible explosions or failures. The A.S.M.E. (American Society of Mechanical Engineers) approval ensures that the safety valve meets stringent industry standards for performance and reliability. It is critical for devices like boilers, which operate under high pressure, to have this level of assurance regarding safety. This dual mention highlights both the necessity of a safety valve and the importance of adhering to regulated standards for safety equipment in high-pressure situations. Other options present potential valves that may serve different functions but do not fulfill the requirement specifically linked to handling excess pressure in steam and high-pressure water boilers. For instance, a liquid relief valve is typically utilized in different contexts and not solely for steam or high-pressure water applications, and a steam safety valve alone does not encompass the broader A.S.M.E. approval aspect necessary for comprehensive safety compliance. Thus, the combination indicated in the correct answer establishes both the necessary equipment and compliance with safety standards.