Plunger for well casings and other tubulars

Pumps – Drilled well free piston-type pump

Reexamination Certificate

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Details

C417S060000, C417S555200, C166S372000

Reexamination Certificate

active

06971856

ABSTRACT:
A plunger for well casings and tubulars comprising: an upper valve rod segment slideably positioned within the plunger body; a valve rod tube slideably positioned in the lower end of the plunger body; a lower valve rod segment slideably positioned in the valve rod tube; a spring positioned between the upper and lower valve rod segments; and a valve element on the upper valve rod segment for closing the plunger flow passage when the upper valve rod segment moves to a closing position. The plunger preferably also comprises an exterior flexible sealing member and a sealing member actuator operated by the valve rod tube. A shield is also preferably provided in the plunger body to prevent premature closure of the valve element.

REFERENCES:
patent: 1790450 (1931-01-01), Torrance
patent: 2674951 (1954-04-01), Zaba
patent: 2688928 (1954-09-01), Vincent et al.
patent: 2830540 (1958-04-01), Vincent
patent: 2850339 (1958-09-01), Vincent
patent: 3147808 (1964-09-01), McCarvell et al.
patent: 3150596 (1964-09-01), Knox
patent: 3273504 (1966-09-01), Lytes
patent: 3329211 (1967-07-01), Roach
patent: 4070134 (1978-01-01), Gramling
patent: 4363606 (1982-12-01), Kilgore
patent: 4531891 (1985-07-01), Coles
patent: 4696624 (1987-09-01), Bass et al.
patent: 4712981 (1987-12-01), Gramling
patent: 4813485 (1989-03-01), Coyle
patent: 4923372 (1990-05-01), Ferguson et al.
patent: 4986727 (1991-01-01), Blanton
patent: 5086839 (1992-02-01), Setterberg, Jr. et al.
patent: 5253713 (1993-10-01), Gregg et al.
patent: 5427504 (1995-06-01), Dinning et al.

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