About: http://webisa.webdatacommons.org/264154579

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	ti-siphon Valves Vacuum relief valves are automatic valves that open or close a vent to relieve a vacuum, depending on whether the vacuum is above or below a predetermined value.
http://www.w3.org/ns/prov#wasQuotedFrom	globalspec.com