Due to differences in the thermal expansion between the valve ball and the transport liquid, the valve will, however, permit {HEAD ~ reverse thermosiphoning} at {TAIL ~ high temperatures} 
at
Due to differences in the thermal expansion between the valve ball and the transport liquid , the valve will , however , permit { HEAD ~ reverse thermosiphoning } at { TAIL ~ high temperatures }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL