Nozzle for fire-fighting with constant flow rate

摘要

The line has a body (1) with an end supporting a hollow head (3) in which a tube (8) and a shaft (9) are placed. The shaft extends coaxially in the tube. The shaft has an end situated opposite to the body for supporting a fitting (10) delimiting a nozzle (11) with the tube. An elastic unit varies a dimension of the nozzle such that output water flow of the nozzle is constant irrespective of the pressure of the water.