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