About: http://webisa.webdatacommons.org/17695439

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	However, a mechanism, such as a spring device, can be added to the control valve to render the momentarily closed position unstable.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es