Plunger and seal for well pump

Pumps – Expansible chamber type – Valved piston

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Details

F04B 2104

Patent

active

057528144

ABSTRACT:
A plunger or traveling valve and seal for a well pump and an oil well pump in particular, which plunger includes a mandrel of selected length, at least one plastic sleeve fitted with at least one metal insert mounted on the mandrel for sealing the mandrel in a pump barrel and a ball and seat valve provided on at least one end of the mandrel. The plunger may include fiber rings and ring holders and is seated inside a conventional pump barrel and the plastic sleeve serves to seal the plunger as the plunger reciprocates in the barrel. The plastic seal is typically constructed of ultra-high molecular weight polyethylene with one or two flanged, typically brass, inserts tightly mounted in the plastic seal bore to control or limit thermal expansion in the plastic seal.

REFERENCES:
patent: 1548805 (1925-08-01), Mowrey
patent: 1714434 (1929-05-01), O'Bannon
patent: 1840432 (1932-01-01), Bray
patent: 2583111 (1952-01-01), Mardis
patent: 3915602 (1975-10-01), Douglas
patent: 4345766 (1982-08-01), Turanyi
patent: 4743329 (1988-05-01), Hafa
patent: 5049347 (1991-09-01), Magill et al.
patent: 5120203 (1992-06-01), Priestly
patent: 5196108 (1993-03-01), Wilmeth et al.
patent: 5255294 (1993-10-01), Bierwirth
patent: 5344678 (1994-09-01), Kajiwara

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