Minnesota Boiler License Practice Exam

What type of shut off would be preferable on a pressure gauge valve that is not used?

1. Non-return

2. Needle-type

3. Cock with a T or lever-type handle

4. Butterfly valve

The correct answer is: Cock with a T or lever-type handle

A cock with a T or lever-type handle is the preferable choice for a shut-off on a pressure gauge valve that is not in use due to its ability to provide a reliable and straightforward method of control. This type of valve allows for quick operation and is easily understood by operators, making it effective in situations where the gauge needs to be isolated from the system. The design of a T or lever-type handle allows for a clear visual indication of whether the valve is open or closed, enhancing safety and minimizing the risk of accidental operation. In the context of maintaining a pressure gauge, it is essential to ensure that the valve can be securely shut off when the gauge is not needed, preventing any unintended backflow or pressure fluctuations. Other types of shut-off valves may not provide the same level of ease and clarity. For example, non-return valves are primarily designed to prevent backflow rather than serve as a shut-off mechanism. Needle-type valves, while capable of precise flow control, may not offer the reliability needed for an infrequently used pressure gauge, as they often require fine adjustments that can be cumbersome. Butterfly valves, on the other hand, tend to be better suited for larger flow applications and can be less effective in applications requiring a tight seal at low flow