<http://webisa.webdatacommons.org/14269467>	<http://www.w3.org/ns/prov#value>	"Therefore, it is possible to employ two valve types in series, one to block leakage and the other to provide proportional control over flow." .
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<http://webisa.webdatacommons.org/14269467>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.es> .
<http://webisa.webdatacommons.org/prov/112920813>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/14269467> .