About: http://webisa.webdatacommons.org/368248342

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 seat member 5 is formed of rubber or other soft material which yields when the ball valve 6 contacts the lower edge I1 thereof when this valve is moved upwardly thereagainst.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com