Fluid handling – Line condition change responsive valves – Direct response valves
Reexamination Certificate
2007-12-25
2007-12-25
Rivell, John (Department: 3753)
Fluid handling
Line condition change responsive valves
Direct response valves
C137S015180, C137S315330, C251S364000
Reexamination Certificate
active
11047183
ABSTRACT:
In an improved floating ball check valve including a body having an outlet port, a cap, having an inlet port, joined with the body, a ball guide slidably received within the body and having a ball pocket for receiving a sealing ball, a biasing spring for biasing the ball toward the inlet port, an annular seat retainer in the cap and a generally ring-shaped seat, of non-resilient plastic material of preferably thermoplastic or fluoroplastic composition, substantially received within a conical bore within the cap and retained therein via the seat retainer, with the spherical surface of the ball being urged into a sealing engagement with an arcuate/spheric sealing surface of the seat having a radius slightly larger than the radius of the sealing ball, with the noted seat materials and geometries permitting seat self-compensation for pressure and temperature. An improved manufacturing method is also set forth.
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U.S. Appl. No. 60/557,652, Michael L. Doutt, Floating Ball Check Valve, filed Mar. 30, 2004.
Hunter Christopher H.
Parker-Hannifin Corporation
Rivell John
LandOfFree
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