About: http://webisa.webdatacommons.org/123609450

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	Valve operational stability is particularly difficult to achieve where the fluid to be controlled is a gaseous fluid, as for example air or steam.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com