The lifting pressure of the valve can vary from 8~15% of the working
pressure for unfired system, but also depends on manufacturers
recommendations. As soon as the pressure of the system becomes normal,
the spring which was set to lift at a particular pressure will close the
valve as a result of the spring tension and the machinery or system
will retain its normal operation.
From safety point of view, safety valves are constructed to have a full lift
to release the excessive pressure when the system is continuously
operating in overpressure situation. Such types of valves are called
safety valve and relief valve falls in the same category.
Moreover, various safety codes and standards are written for
controlling the design and application of the relief valve so that even
after failure of other safety systems, relief valve will operate to
avoid any catastrophe.
Construction of Relief Valve
The relief valve is a critical part of the safety system which is
integrated in the ship’s machinery; hence their designing is kept as
simple as possible using materials of compatible strength which can
operate in various conditions such as high temperature, air flow, fluid
flow, corrosive media etc.
Different parts of relief valve are described below:

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