How it works
The diesel engine is a type of internal combustion engine which ignites the fuel by injecting it into hot, high-pressure air in a combustion chamber. In common with all internal combustion engines the diesel engine operates with a fixed sequence of events, which may be achieved either in four strokes or two, a stroke being the travel of the piston between its extreme points. Each stroke is accomplished in half a revolution of the crankshaft.
The cylinder relief valve is designed to relieve pressures in excess of 10% to 20% above normal. A spring holds the valve closed and its lifting pressure is set by an appropriate thickness of packing piece . Only a small amount of lift is permitted and the escaping gases are directed to a safe outlet. The valve and spindle are separate to enable the valve to correctly seat itself after opening.
The operation of this device indicates a fault in the engine which should be discovered and corrected. The valve itself should then be examined at the earliest opportunity.
Fig :cylinder relief valve
Related Information:
Explosion relief valve of a marine diesel engine
Starting air system for diesel engine - how it works
Crankcase oil mist detector of a marine diesel engine
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The fuel oil system for a diesel engine
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Scavenging methods - Cross-flow scavenging, loop scavenging, & uniflow scavenging
Countermeasures against scavange space fires
Various Heat exchanger for running machinery on board cargo ships
Starting air system for diesel engine - how it works
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