<http://webisa.webdatacommons.org/343280238>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/106447166>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/343280238> .
<http://webisa.webdatacommons.org/prov/104578970>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/343280238> .
<http://webisa.webdatacommons.org/343280238>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/343280238>	<http://www.w3.org/ns/prov#value>	"In order to provide enhanced sealing, the sealing surface 56 of the plug 50 or the sealing surface 48 of valve seat 42 may preferably be provided with an annular groove within which is received a resilient sealing element which may be formed from a polymeric material such as rubber, Teflon or other suitable material." .