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Difference between saftey valve and relif valve

Safety valves:
it’s a pressure relief valve actuated by inlet static pressure and characterized by rapid action or pop up action.safety valves generally applies to valves protecting vessels where ther is a risk of explosion.the vent of a saftey valve is lead to a safe place. 
Relief valves:
Actuated by static inlet pressure and opens in proportional to the increase in pressure over the opening pressure.protecting vessels containg non expandable liquids which wont cause explosion. relif valve vents outside the valve
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