{HEAD ~ Fluid communication} from {TAIL ~ the system} may thereafter occur along the second flow path at the relief valve apparatus opens in response to pressure buildup in the flow path 
from
{ HEAD ~ Fluid communication } from { TAIL ~ the system } may thereafter occur along the second flow path at the relief valve apparatus opens in response to pressure buildup in the flow path
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH