Well pump

Details Well pump Well pump

1986-04-08

1987-08-25

Freeh, William L.

Pumps

Expansible chamber type

Valved piston

417DIG1, F04B 2104, F04B 3910

Patent

active

046889990

ABSTRACT:
A well pump includes a piston and an inlet and/or outlet valve assembly of special structure. Each is formed of a body of organic polymer, preferably PTFE. Each includes a cavity in its upper portion and at least one passage leading from the cavity to the bottom of the block. A screen covers each cavity and a valve disk covers each screen. Flexible sealing flanges extend upwardly and downwardly from the periphery of the piston block. The outlet valve block has a sliding block and sealing fit with the piston rod.

REFERENCES:
patent: 213173 (1879-03-01), Coates
patent: 797111 (1905-08-01), Hellman
patent: 2258009 (1941-10-01), Horton
patent: 2377916 (1945-06-01), Anderson
patent: 2915986 (1959-12-01), Sisson
patent: 2973833 (1961-03-01), Cook
patent: 2984190 (1961-05-01), Dibley
patent: 3095825 (1963-07-01), Sandberg
patent: 3176595 (1965-04-01), Schwartz
patent: 3270687 (1966-09-01), Hoffinga
patent: 3904326 (1975-09-01), Clement
patent: 4023467 (1977-05-01), Thurner
patent: 4240507 (1980-12-01), Hokkanen
patent: 4301971 (1981-11-01), Cornelius

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