Conveying systems

A conveying system comprising:

• a gravity hopper having a top opening for receiving a conveyable material and a lower hopper outlet for directing the conveyable material therefrom wherein the conveyable material is subject to forming a bridge over the lower hopper outlet thereby preventing flow of the conveyable material from the gravity hopper;
• a housing having a material receiving chamber connected to the hopper outlet for carrying the conveyable material away from the lower hopper outlet;
• a bridge breaker located vertically below the lower hopper outlet with said bridge breaker having a fluid chamber therein and a top fluid port located in a separator between the material receiving chamber and the fluid chamber in the bridge breaker, said bridge breaker including a slideable piston having a first end momentarily displaceable for opening or closing the top fluid port in the separator;
• and
• a source of pressurized gas located in the fluid chamber for an on demand delivery of a charge of gas upward through the top fluid port when the top fluid port is in an open condition with the charge of gas flowing upward into an underside of a bridge of material over the hopper outlet to disintegrate the bridge of material from below thereby allowing the conveyable material forming the bridge to fall into the material receiving chamber in the conveying system.