A pressure relief valve, the valve comprising: a valve body, the valve body having a valve chamber, the valve chamber having a valve seat on {HEAD ~ a structure} raised above {TAIL ~ a valve chamber base surface} and at least one gas port through the valve seat, the gas port adapted for fluid communication of gases through the valve chamber, from one side of the valve to the other side of the valve, the valve seat further comprising a substantially hemispherical dome with a truncated generally flat surface 
A pressure relief valve , the valve comprising : a valve body , the valve body having a valve chamber , the valve chamber having a valve seat on { HEAD ~ a structure } raised above { TAIL ~ a valve chamber base surface } and at least one gas port through the valve seat , the gas port adapted for fluid communication of gases through the valve chamber , from one side of the valve to the other side of the valve , the valve seat further comprising a substantially hemispherical dome with a truncated generally flat surface
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