About: http://webisa.webdatacommons.org/316496971

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	At least one valve is a check valve that prevents the aqueous solution from escaping the pressurized chamber, and flowing upstream toward the screen and screen housing.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com