About: http://webisa.webdatacommons.org/81375406

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	Synthetic materials, such as Teflon, may also be suitable, in that the valve spool would have low inertia and low frictional characteristics.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com