About: http://webisa.webdatacommons.org/422952551

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	When the valve 212 is disposed in a closed position, such as the closed position shown in FIG. 21, no gas flows to pump 208 and pump 208 is incapable of creating a useful vacuum.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com