Single acting piston

Details Single acting piston Single acting piston

1976-11-18

1979-06-05

Freeh, William L.

Expansible chamber devices

With non-sealing cleaning means

417900, 417437, 92 865, F01B 3100, F04B 3900

Patent

active

041570570

ABSTRACT:
A single acting pump has a piston with an elastomeric and synthetic fabric seal ring and is provided with means to supply fluid to the piston and passages in the piston for circulating fluid to cool and clean the piston on both the pressure stroke and the back stroke. The passages in the piston include a check valve preventing flow of fluid to the back side of the piston during the pressure stroke and permitting fluid flow to the seal ring during the back stroke.

REFERENCES:
patent: 1474718 (1923-11-01), Humason
patent: 1541546 (1925-06-01), Wigle
patent: 1550767 (1925-08-01), Weaver
patent: 1647425 (1927-11-01), Wise
patent: 2367135 (1945-01-01), Carey
patent: 2547506 (1951-03-01), Walsh
patent: 2797972 (1957-07-01), Martin
patent: 2871072 (1959-01-01), Parks et al.
patent: 3104619 (1963-09-01), Swarthout
patent: 3146990 (1964-09-01), McCrory et al.
patent: 3279383 (1966-10-01), Smith
patent: 3720140 (1973-03-01), Lee
patent: 3749529 (1973-07-01), Cornelson
patent: 4023469 (1977-05-01), Miller

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