Volute 1 : (Techn) The spiral, divergent chamber of a centrifugal pump in which the kinetic energy imparted to water by the impeller blades is converted into pressure
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}