About: http://webisa.webdatacommons.org/359179341

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	need a check valve or other mechanism to maintain the neutral state, because the lack of eccentricity ensures that the pistons do not create a fluid pressure or flow.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com