With reference to auxiliary boiler safety valves:
a) Describe, with the aid of a sketch, the safety valves for an auxiliary boiler.
(6)
b) Identify, with reasons, the parts that require particularly close attention during overhaul;
(5)
c) Describe how the safety valves are reset after an overhaul.(5)
Reference Answer
### a) Description of an Auxiliary Boiler Safety Valve A typical safety valve for an auxiliary boiler is of the **Improved High-Lift** spring-loaded type. Its primary function is to automatically discharge steam if the boiler pressure exceeds the safe, predetermined limit, and to close again once the pressure has been reduced to a safe level. **Construction:** * **Valve Body:** A robust casing, usually made of cast steel, designed to withstand high pressure and temperature. It contains the inlet from the boiler and the outlet to the atmosphere or a safe discharge line.
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