About: http://webisa.webdatacommons.org/246837445

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	The drainage valve assembly remains closed to prevent escape of gas from the pressurized pipeline, tank or other pressurized vessel.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au