Flushable rotary gear pump

Rotary expansible chamber devices – Interengaging rotating members – Like rotary members

Patent

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Details

417283, 417310, F01C 118, F04B 4900

Patent

active

044001479

ABSTRACT:
Flushable rotary gear pumps for delivering fluidic material, such as liquid coating material, may quickly and thoroughly be flushed of material of one type in preparation for delivering material of another type. In one embodiment, a valve selectively establishes a bypass channel between an inlet to and an outlet from a pump, thereby to accommodate a relatively large volume flow of flushing media through the pump and supply and delivery lines therefor. In another embodiment, the valve is structured to monitor fluid pressure developed by the pump and to automatically control and limit the pressure to a maximum value should an overpressure condition develop. In yet other embodiments passages are provided internally of the pump for conveying flushing media to all exposed surfaces of the gears, gear shafts and pump body to flush the same of coating material, whereby the entirety of the pump may readily be cleansed. If desired, the various features may be combined in a single pump.

REFERENCES:
patent: 2808004 (1957-10-01), Durant et al.
patent: 3130673 (1964-04-01), Finstad
patent: 3806283 (1974-04-01), Leverett
patent: 4073605 (1978-02-01), Wakeman et al.

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