What are try cocks used for in a boiler?

Try cocks serve a crucial function in a boiler system by allowing operators to determine the boiler water level, especially when the gauge glass is not providing accurate readings. They are small valves situated at various points along the boiler, and when opened, they release a small amount of water from the boiler. By observing the water that comes out of the try cock, operators can ascertain the level of water in the boiler.

This is particularly important for maintaining safe operating conditions, as too low a water level can lead to boiler damage or failures. In scenarios where the gauge glass is malfunctioning, try cocks provide a reliable alternative to ensure that the water level is monitored adequately and that the boiler operates safely within its designed parameters. The other options, while they may relate to other aspects of boiler operation, do not encompass the primary objective of try cocks effectively.