About: http://webisa.webdatacommons.org/313935338

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	In one exemplary embodiment, valve 52 is implemented by a check valve having a spring acting on a seating element, such as a ball, to maintain a seal when the spring is not depressed.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com