About: http://webisa.webdatacommons.org/94233227

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	The valve is also preferably made of lightweight material such as aluminum, Teflon, Delron impregnated Teflon, or other composite material.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com