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<http://webisa.webdatacommons.org/226843802>	<http://www.w3.org/ns/prov#value>	"Lift gas, such as compressed air, is charged to the bottom inlet of riser 52 by a hollow stem plug valve 60 comprising flow control means (not shown)." .
<http://webisa.webdatacommons.org/226843802>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/prov/281379519>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/226843802> .