Answer / anand swami

purpose of the both are same to release excess pressure.
safety v/v have a set pressure at which it opens and a reset
pressure at which it resets on its sit that means at a
certain pressure it opens full and at certain pressure it
closes fully,
but in case of relief v/v it opens accordingly to the
pressure raise.
Safety valve - A pressure relief valve actuated by inlet
static pressure and characterised by rapid opening or pop
action.
Relief valve - A pressure relief device actuated by inlet
static pressure having a gradual lift generally proportional
to the increase in pressure over opening pressure.

Answer / xavier

The main difference between a relief valve and a safety
valve is the extent of opening at the setpoint pressure

Answer / balaji.r

both the valves are helps to protect the Circuit /
Installations(Pneumatic / Hydraulics)

Pneumatic : Safety valves helps to release excess pressure
from the reservoir

Hydraulic : PRVs used to bypass the excess pressure to the
Sump / Tank ...etc

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