Piston with composite retention valve

Details Piston with composite retention valve Piston with composite retention valve

1982-09-29

1986-05-27

Freeh, William L.

Pumps

Successive stages

Reciprocating rigid stages

417513, 417514, 417520, F04B 300, F04B 700

Patent

active

045913153

ABSTRACT:
A positive displacement pump particularly useful in pumping viscous fluids which may or may not contain gases, including water vapor, and/or suspended solids in which the actual flow equals the theoretical maximum flow through a check valve associated with the pump, said pump including a piston having a plug valve incorporated therein which has limited reciprocable movement within an extension of the piston, and, also, within a cage which is reciprocable within said extension, the flow area within the piston downstream from the plug being at least equal to the flow area past the plug.

REFERENCES:
patent: 573860 (1896-12-01), Chapman
patent: 706861 (1902-08-01), Sehe
patent: 1221843 (1917-04-01), Dierks
patent: 1538855 (1925-05-01), Jackson
patent: 2775212 (1956-12-01), Hilton
patent: 2791970 (1957-05-01), Hunter
patent: 2933050 (1960-04-01), Crowl et al.
patent: 3109384 (1963-11-01), Adams
patent: 4332533 (1982-01-01), Spears

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