Fluid reservoir device

Details Fluid reservoir device Fluid reservoir device

1989-02-17

1990-03-13

Bryant, III, James E.

Pipes and tubular conduits

With pressure compensators

Variable capacity chambers

138 26, 1374925, F16L 5504

Patent

active

049076221

ABSTRACT:
A fluid reservoir and pressure protection device for use with fluid-filled systems comprises a cylindrical chamber wall, bottom chamber wall and depending mounting shank defining an inlet opening. A first piston slides in the cylindrical chamber wall between upper and lower positions, and has an annular working surface defining a central opening. A hollow cylindrical piston stem extends upwardly from the central opening. The first piston is spring biased downwardly. A second piston slides in the hollow piston stem between upper and lower positions. The working surface of the second piston, the annular surface of the first piston and the hollow piston stem together close a variable volume chamber. The second piston is also biased downwardly. A low friction support and interface for the piston stem includes an annular support ring extending inwardly from the upper cylindrical chamber wall and continuously surrounding the piston stem, at least one continuous piston stem guide ring fabricated of a rigid, lubricious long wearing polymer being carried in a groove in the support ring and interfacing with the piston stem. The exterior interfacing surface of said piston stem is anodized with a Type III or harder anodize. When the chamber is filled with fluid, the first piston is biased downwardly from its upward position to supply fluid to the system as required, and when additional fluid is forced from the system into the chamber, the first and thereafter the second piston are driven upwardly to accommodate it.

REFERENCES:
patent: 1434952 (1922-11-01), Johnson
patent: 1705197 (1929-03-01), Mills
patent: 2237321 (1941-04-01), Wesley
patent: 2780504 (1957-02-01), Russell
patent: 3863677 (1975-02-01), Tarsha
patent: 4000758 (1977-01-01), Meisenheimer, Jr.
patent: 4307753 (1981-12-01), Dryer

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