Valve insert

Fluid handling – Line condition change responsive valves – Direct response valves

Reexamination Certificate

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Details

C251S332000, C251S334000, C251S357000, C277S489000

Reexamination Certificate

active

07909057

ABSTRACT:
A valve insert including a ring made of a resilient material. The ring has a shape that is defined by the rotation of an irregular polygon around a central axis. Superposing a quadrilateral and a circle forms the irregular polygon.

REFERENCES:
patent: 3742976 (1973-07-01), Bailey
patent: 4180097 (1979-12-01), Sjoberg
patent: 4951707 (1990-08-01), Johnson
patent: 5249600 (1993-10-01), Blume
patent: 5345965 (1994-09-01), Blume
patent: 6955181 (2005-10-01), Blume
patent: 6955339 (2005-10-01), Blume
patent: 7168440 (2007-01-01), Blume

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