Apparatus for pneumatically conveying bulk material

Details Apparatus for pneumatically conveying bulk material Apparatus for pneumatically conveying bulk material

1988-04-28

1990-03-20

Peters, Jr., Joseph F.

Conveyors: fluid current

With means to control conveying fluid or movement of load in...

Control of conveying fluid

406 11, 406 15, 406 94, 406 95, B65G 5366, B65G 5304

Patent

active

049096761

ABSTRACT:
An apparatus for pneumatically conveying bulk material includes a conveyor line for transporting the bulk material and a secondary line which carries clean gas and is sectionized by spaced three-way/two-way directional control valves. Each control valve is actuated by a pressure transmitter which compares the actual pressure in the conveyor line with the desired pressure in a third line carrying a fluid at a desired pressure decreasing in downstream direction in accordance with the pressure drop in the conveyor line during normal operation. A communication between the conveyor line and the second line is provided by respective branch lines which define the third connection of the control valves and are multiply connected to the conveyor line. Thus, upon encountering a pressure drop in an area of the conveyor line, the respective pressure transmitter actuates the pertaining control valve which shuts off downstream section of the second line and connects the second line with the conveyor line for introducing clean gas into the conveyor line at the desired area thereof.

REFERENCES:
patent: 3295896 (1967-01-01), Hurtig et al.
patent: 3929379 (1975-12-01), Krambrock
patent: 4067622 (1978-01-01), Krambrock et al.
patent: 4389143 (1983-06-01), Nadin et al.
patent: 4515503 (1985-05-01), Snowdon
patent: 4715748 (1987-12-01), Krambrock

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