Minnesota Boiler License Practice Exam

When can dead-weight or weighted-lever safety valves be used?

1. When pressure is less than 100 psi

2. Never

3. Only by permission of boiler inspector

4. Under 15 psi

The correct answer is: Never

Weighted-lever safety valves, commonly known as dead-weight safety valves, are designed primarily for low-pressure applications. They are typically used in scenarios where the system pressure does not exceed certain thresholds. However, regulations and safety standards limit their use because of potential hazards associated with their operation. When a question pertains to the use of weighted-lever safety valves, it is essential to consider the safety implications and the delegation of authority regarding their operation. The use of these types of valves is often restricted due to their mechanical nature, which can lead to malfunctions if not properly maintained. As a consequence, they are not to be utilized generally; this aligns with the understanding that safety valves should be reliable and efficient in preventing overpressure conditions. In systems where safety and compliance with recommended practices are critical, it is evident why the option states that weighted-lever safety valves should never be used. This stance helps to uphold safety standards and ensure that boiler systems remain within the necessary operating pressures without risking operational failures or safety hazards.