About: http://webisa.webdatacommons.org/324162343

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	A pressure-sensitive valve 24 is provided, typically made of the flexible material such as silicone, in the shape of a flat cone, such that the outer perimeter of the cone presses against the rim 22 (FIGS. 3 and 4).
http://www.w3.org/ns/prov#wasQuotedFrom	google.com