Inlet & outlet connection
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.
Valve: The valve plays an important role for
controlled operation of the relief valve and its malfunction will lead
to leakage of media from the machinery or system. It is normally made of
stainless steel.
Spindle/ plunger: The spindle/plunger also known as
valve stem has a valve attached at the bottom and the spring acts on top
of it. The force exerted by spring is transferred to the valve through
spindle. The material used for spindle is stainless steel.
Spring and adjusting nut: The helical spring should
have proper elasticity strength so that the valve seat can open and
close at correct set pressure. Adjusting bolts are located on the top of
the body. By rotating the screw the lifting pressure of the valve can
be adjusted. The adjusting screw and the spring are generally made of
steel alloy.
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