Minnesota Boiler License Practice Exam 2026 – All-in-One Guide to Passing with Confidence

Question: 1 / 400

Which type of safety valve is NOT permissible for use?

Positive weight

Direct spring loaded type

Combination of weight and spring

Dead-weight type

The dead-weight type safety valve is not permissible for use because it relies on the weight of the closing element to hold the valve shut until a specified pressure is reached. This design can lead to inconsistencies in performance as it is susceptible to variations in operating conditions such as temperature and pressure fluctuations. Additionally, dead-weight valves can be cumbersome and less reliable in emergency situations where quick venting of steam or pressure is critical.

On the other hand, the positive weight, direct spring-loaded type, and combinations of weight and spring are all accepted designs. These designs provide more reliable and consistent operation. Spring-loaded safety valves, for example, are favored because they allow for quick response to pressure changes and can be calibrated precisely to open at specific pressure thresholds, ensuring that safety measures are upheld in a boiler system.

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