Difference Between Safety Valve And Relief Valve

Safety Valve
>Directly open when the pressure reaches at set pressure.
>Can open manually.
>Setting pressure is just above the working and not more than 3% above the approved working pressure.
>Due to its popping up action wire draw effect due to steam is reduced.

>In this valve opening is sudden when the set pressure is reached.

Relief valve
>Opening is proportion to the increase in pressure.
>Can not be open manually.
>Setting pressure is 10% above working pressure.
>There is no popping up action so wire draw effect can be seen between valve and valve seat.
>In this valve opening is proportional to increase in pressure, so the valve opening is gradual if increase in pressure is gradual.


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