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