Fluent material handling – with receiver or receiver coacting mea – Fluent charge impelled or fluid current conveyed into receiver
Patent
1988-11-23
1990-12-04
Cusick, Ernest G.
Fluent material handling, with receiver or receiver coacting mea
Fluent charge impelled or fluid current conveyed into receiver
141 46, 141 83, 141128, 177105, 177116, 177122, 222 77, 222 56, 222544, 406 23, 406 84, 406181, B65D 8872, B65G 5350
Patent
active
049746464
ABSTRACT:
The disclosure relates to a powder flow control valve comprising a nozzle formed from a material such as high density polythene having an upper frusto-conical section which converges towards the lower end of the nozzle and terminates in a cylindrical section. The nozzle is encircled by a plenum chamber to which sources of vacuum and air pressure are selectively connectable through a pneumatic control system. When vacuum is connected to the plenum chamber, the resulting pressure drop across the wall of the porous nozzle causes powder flowing through the nozzle to consolidate in the nozzle and terminate the flow. When air pressure is applied to the plenum chamber, the resulting pressure rise across the boundary surface accelerates powder flow through the nozzle. The control means is arranged to establish air pressure in the plenum chamber to initiate opening of the valve and flow through the valve and, after a pre-determined time, to terminate the air pressure supply and allow powder to flow under gravity through the nozzle before flow is terminated when a pre-determined quantity of powder has been delivered by the nozzle by applying vacuum to the plenum chamber.
REFERENCES:
patent: 3506111 (1970-04-01), Eppenberger
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patent: 4573504 (1986-03-01), Rosenstrom
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patent: 4688610 (1987-08-01), Campbell
patent: 4735241 (1988-04-01), Spiess
MacDonald Roderick
Martin David
Cusick Ernest G.
Portals Engineering Limited
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