About: http://webisa.webdatacommons.org/412074565

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 pressure within the container 402 reaches a predetermined level, such as between about 0 psi and about 6 psi and preferably about 3 psi, then the vapor valve 408 may be closed.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr