Patent ID: 6106202
Filing Date: 2000-08-22
Classification: B65G

Abstract:
A pneumatic transport system for bulk material utilizing dense phase techniques for conveying material in a pneumatic conveying line, the system comprising:a conveying conduit;a material transport at an inlet end of the conveying conduit for moving material to be conveyed into the conveying conduit;a receiver at an outlet end of the conveying conduit, with the conveying conduit being a continuous conveying conduit between the transporter and receiver; andat least one air assist along the conveying conduit, said air assist including a pressure regulating valve to connect it to a source to provide a regulated fluid flow, a pilot operated control valve connected to the output of the regulator and having an air assist gas outlet line connected to an output of the control valve to discharge a gas into the conveying conduit when the pilot operated control valve is open, a pilot pressure sensing line coupled to the pilot operated control valve and connected to the air assist gas outlet line, and a source of a low flow fluid open to the pilot pressure sensing line to provide a continuous flow of fluid into the air assist gas outlet line and the conveying conduit when the transport system is operated, back pressure in the pilot pressure sensing line causing the pilot operated control valve to open.