Cod. 63432899 1”¼ ball valve complete with chemical dissolving nozzle. It is a 5-way valve with threaded flanges and/or quick-couplings that can be attached on the outside of the mixer hopper to perform the following functions: 1) feed the Venturi system for mixer emptying; 2) feed the internal hopper nozzle to dissolve the chemicals; 3) feed the quick-funnel by means of the control taps; 4) external feed for auxiliary functions. It can be coupled to the “G” pressure regulating safety valve.