About: http://webisa.webdatacommons.org/215208074

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	While check valves are shown, other types of valves can be used with appropriate controls to open and close them.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com