New York Low Pressure Boiler COF Test 2025 – 400 Free Practice Questions to Pass the Exam

A gauge is protected from excessive pressure primarily through the use of a pressure relief valve. These valves are designed to open automatically at a preset pressure to release excess pressure from the system, thereby preventing damage to gauges, pipes, and other components.

Shut off cocks can isolate parts of the system but do not provide any mechanism for controlling excessive pressure. They are typically used for maintenance purposes or to cut off flow, rather than being directly involved in pressure regulation. The safety valve also serves a similar function as a pressure relief valve but is more commonly associated with protection on boilers or pressure vessels rather than specifically gauges. A bypass valve allows fluid to bypass a certain component, but it does not offer protection against pressure surges.

Therefore, the function of protecting a gauge from excessive pressure most accurately aligns with the operation of a pressure relief valve.