other parts of boiler

Safety Valves: These are mounted in pairs to protect the boiler against (from) overpressure.

Main steam stop valve: This valve is fitted in the main steam supply line and is usually of the non-return type.

Feed check or control valve: A pair of valves are fitted : one is the main valve, the other the auxiliary or standby. They are non-return valves and must give an indication of their open and closed position.

Water level gauge: Water level gauges or "gauge glasses" are fitted in pairs, at opposite ends of the boiler, the construction of the level gauge depends on the boiler pressure.