About: http://webisa.webdatacommons.org/360463338

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 controllable valve, responsive to control signals received from the computer or other control device, regulates displacement of the cylinder to modify the rate of boom movement and the boom position.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr