System for transferring dry flowable material

A system for transferring dry flowable material comprising, in combination;

• a substantially closed vessel defining an inlet adapted to receive flowable material therein and a discharge end enabling discharge of material from said vessel, a cycle valve, a first flow conduit communicating with said cycle valve and adapted for connection to a source of pressurized fluid flow, a second flow conduit communicating with said cycle valve so as to enable selective pressurized fluid flow therethrough from said cycle valve, a third flow conduit communicating with said cycle valve and said vessel so as to enable flow of pressurized fluid from said cycle valve to said vessel, said cycle valve being selectively operable between a first condition operative to effect fluid pressure flow from said first to said second flow conduits, and a second condition operative to effect fluid pressure flow from said first to said third flow conduits so as to pressurize said vessel, means defining a venturi communicating with said second flow conduit and having a restricted throat such that fluid pressure flow through said second flow conduit passes through said venturi and normally creates a predetermined reduced pressure within the restricted throat of the venturi, a fourth flow conduit communicating with said restricted throat of said venturi means and said vessel so as to effect a suction condition within said fourth flow conduit during fluid flow through said venturi from said second conduit, and control means operatively associated with said cycle valve so as to automatically cycle said cycle valve between its said first condition wherein a suction is created within said vessel sufficient to effect filling thereof with flowable material, and its said second condition operative to introduce fluid pressure into said vessel sufficient to effect discharge of flowable material from said discharge end, said control means including a pressure responsive control switch directly communicating with said restricted throat of said venturi in a manner to detect pressure changes therein, said control means being operative in response to a first fluid pressure detected within the throat of said venturi to condition said cycle valve so as to effect filling of said vessel to an extent that flowable material is drawn through said fourth conduit into said venturi to increase the pressure within said throat, said pressure responsive switch being operative in response to a predetermined pressure increase within said venturi throat to condition said cycle valve so as to pressurize said vessel and effect discharge of material therefrom until the fluid pressure within said vessel and said fourth conduit returns the pressure in said venturi throat to said first fluid pressure therein whereby to automatically condition said cycle valve to again effect filling of said vessel.