Minnesota Boiler License Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Study for the Minnesota Boiler License Exam. Deepen your knowledge with expertly designed flashcards and multiple choice questions, each complete with helpful hints and detailed explanations. Get prepared for your licensing success!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Is the valve stem connected to the disc on an automatic non-return valve?

No
Yes
Only when open
Only during maintenance

The correct answer is: No

In an automatic non-return valve, the valve stem is typically not connected to the disc. This design allows the disc to move freely in response to the flow of fluid, permitting it to open when fluid is moving in the correct direction and close against backflow. The separate movement ensures that pressure changes do not inadvertently transmit to the stem, which is crucial for the valve's operation and function. The automatic non-return mechanism relies on the weight or spring action of the disc rather than a direct mechanical connection to the stem, allowing for independent operation. This feature prevents the risk of the valve opening unintentionally due to pressure fluctuations or changes in flow direction, thus maintaining system integrity and preventing backflow. Understanding this mechanism is crucial for ensuring proper maintenance and operational efficiency when working with such valves in boiler systems.