Body: The body of the relief valve is normally made
up of cast steel. It incorporates all the parts like valve spindle,
valve, spring, seat etc. It must be strong enough to withstand the high
pressure when valves open to release the excessive pressure through the
body.
Inlet & outlet connection: The relief valve
inlet is connected to the machinery or system and its outlet connection
can be open to atmosphere near to the system only in case of air system,
driven through a duct outside the engine room normally for steam system
or connected to the inlet or to some reservoir for hydraulic system.
Diaphragm: The diaphragm act as a seal between the
inlet outlet connection and valve body so that media should not leak
through the valve body when relief valve operates.
Valve seat: The seat must be soft enough so that it
should not damage the valve and durable enough for higher operating life
else the media for which the valve is used will leak. The seat is
normally made of stainless steel coated with soft metal to tackle
pressure and corrosion together.

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