Diffusion Vane Pump : A type of fire pump, usually stationary, in which the discharge from the impeller is guided by a number of diffusion vanes instead of discharging into a volute chamber. See: Turbine Pump
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}